feat: Implement fixed sale price functionality for items

- Added a toggle for fixed sale price vs stock value in the item creation form.
- Introduced validation to ensure all variants have a price greater than 0 when fixed price mode is selected.
- Updated the item model to include a nullable salePrice field, which is used for sales only and does not affect GRN/FIFO/ledger.
- Enhanced the GRN page to allow off-PO items and included a refresh button to update the item list without reloading the page.
- Updated documentation to reflect changes in item pricing and GRN handling.

.gitignore

@@ -29,3 +29,10 @@ yarn-error.log*
 .DS_Store
 Thumbs.db
 .idea/
+
+# ── Migrations ─────────────────────────────────────────────────────────
+# New EF Core migrations are not committed. Note the 4 migrations already in
+# Backend/ERPCore/Infra/Persistence/Migrations/ stay tracked — .gitignore does
+# not apply to tracked files — so edits to those still get committed as normal.
+# Untracking them too takes `git rm --cached`.
+**/Migrations/

Backend/ERPCore/Controllers/AuthController.cs

@@ -1,4 +1,5 @@
 using ERPCore.Dtos.Auth;
+using ERPCore.Dtos.Rbac;
 using ERPCore.Infra.Auth;
 using ERPCore.Services.Interfaces;
 using ERPCore.System.Errors;
@@ -25,12 +26,27 @@ public sealed class AuthController : ControllerBase
     private readonly IAuthUserService _users;
     private readonly IAuthRecoveryService _recovery;
     private readonly IAuthAltService _alt;
+    private readonly IRoleService _roles;
 
-    public AuthController(IAuthUserService users, IAuthRecoveryService recovery, IAuthAltService alt)
+    public AuthController(IAuthUserService users, IAuthRecoveryService recovery, IAuthAltService alt, IRoleService roles)
     {
         _users = users;
         _recovery = recovery;
         _alt = alt;
+        _roles = roles;
+    }
+
+    /// <summary>
+    /// Authoritative current-session info for the frontend: role + the sidebar nav
+    /// codes it may see (docs/10 C.9 shadow-Role sync). Replaces the frontend's
+    /// previous reliance on a stale, untrusted `roleId` cached in localStorage.
+    /// </summary>
+    [HttpGet("me")]
+    [ProducesResponseType(typeof(MeResponseDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<MeResponseDto>> Me(CancellationToken ct)
+    {
+        var roleCode = User.FindFirst(AuthHexClaims.RoleCode)?.Value;
+        return Ok(await _roles.GetMeAsync(roleCode, ct));
     }
 
     // ---- Session-issuing (UserManager) ------------------------------------

Backend/ERPCore/Controllers/NavController.cs

@@ -0,0 +1,39 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Dtos.Rbac;
+using ERPCore.Repositories.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+
+namespace ERPCore.Controllers;
+
+/// <summary>
+/// Read-only sidebar nav tree, used by the Role permission-assignment checkbox
+/// UI and by `GET /auth/me` (see AuthController) to resolve a role's visible codes.
+/// NavItem/SubNavItem rows are seeded (NavItemConfiguration/SubNavItemConfiguration)
+/// to match the frontend's hardcoded sidebar — not admin-editable in this phase.
+/// </summary>
+[Route("api/v1/nav")]
+public sealed class NavController : ApiControllerBase
+{
+    private readonly IRepository<NavItem> _navItems;
+
+    public NavController(IRepository<NavItem> navItems) => _navItems = navItems;
+
+    [HttpGet]
+    [ProducesResponseType(typeof(List<NavItemDto>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<List<NavItemDto>>> GetTree(CancellationToken ct)
+    {
+        var items = await _navItems.Query().AsNoTracking()
+            .Include(n => n.Children)
+            .OrderBy(n => n.SortOrder)
+            .ToListAsync(ct);
+
+        var dto = items.Select(n => new NavItemDto(
+            n.NavItemId, n.Code, n.Label, n.Icon, n.Href, n.SortOrder,
+            n.Children.OrderBy(c => c.SortOrder)
+                .Select(c => new SubNavItemDto(c.SubNavItemId, c.Code, c.Label, c.Icon, c.Href, c.SortOrder))
+                .ToList())).ToList();
+
+        return Ok(dto);
+    }
+}

Backend/ERPCore/Controllers/PurchaseOrdersController.cs

@@ -57,6 +57,25 @@ public sealed class PurchaseOrdersController : ApiControllerBase
         return Ok(result.Value);
     }
 
+    /// <summary>Submit a Draft PO (Draft → Approved). 409 PO_NOT_EDITABLE if not Draft.</summary>
+    [HttpPost("{poId:int}/submit")]
+    [ProducesResponseType(typeof(PurchaseOrderDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    public async Task<ActionResult<PurchaseOrderDto>> Submit(int poId, CancellationToken ct)
+        => Ok(await _pos.SubmitAsync(poId, ct));
+
+    /// <summary>Delete a PO — permitted only while Draft (409 PO_NOT_EDITABLE otherwise).</summary>
+    [HttpDelete("{poId:int}")]
+    [ProducesResponseType(StatusCodes.Status204NoContent)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    public async Task<IActionResult> Delete(int poId, CancellationToken ct)
+    {
+        await _pos.DeleteAsync(poId, ct);
+        return NoContent();
+    }
+
     /// <summary>Approve — no-op in Phase 1 (POs auto-approve); transitions PendingApproval→Approved when enabled.</summary>
     [HttpPost("{poId:int}/approve")]
     [ProducesResponseType(typeof(PurchaseOrderDto), StatusCodes.Status200OK)]

Backend/ERPCore/Controllers/RolesController.cs

@@ -0,0 +1,88 @@
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Rbac;
+using ERPCore.Services.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ERPCore.Controllers;
+
+/// <summary>Role CRUD + permission assignment (mirrors AuthHex's Role; see docs/10 C.9).</summary>
+[Route("api/v1/roles")]
+public sealed class RolesController : ApiControllerBase
+{
+    private readonly IRoleService _roles;
+
+    public RolesController(IRoleService roles) => _roles = roles;
+
+    [HttpGet]
+    [ProducesResponseType(typeof(PagedResponse<RoleDto>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<PagedResponse<RoleDto>>> List(
+        [FromQuery] PageQuery query, [FromQuery] EntityStatus? status, CancellationToken ct)
+        => Ok(await _roles.ListAsync(query, status, ct));
+
+    [HttpGet("{roleId:int}")]
+    [ProducesResponseType(typeof(RoleDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<RoleDto>> GetById(int roleId, CancellationToken ct)
+    {
+        var result = await _roles.GetAsync(roleId, ct);
+        if (result is null) return NotFound();
+
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpPost]
+    [ProducesResponseType(typeof(RoleDto), StatusCodes.Status201Created)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    public async Task<ActionResult<RoleDto>> Create([FromBody] CreateRoleRequest request, CancellationToken ct)
+    {
+        var result = await _roles.CreateAsync(request, ct);
+        SetETag(result.RowVersion);
+        return Created($"/api/v1/roles/{result.Value.RoleId}", result.Value);
+    }
+
+    [HttpPut("{roleId:int}")]
+    [ProducesResponseType(typeof(RoleDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status412PreconditionFailed)]
+    public async Task<ActionResult<RoleDto>> Update(int roleId, [FromBody] UpdateRoleRequest request, CancellationToken ct)
+    {
+        var expected = RequireIfMatch();
+        var result = await _roles.UpdateAsync(roleId, request, expected, ct);
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpPatch("{roleId:int}/status")]
+    [ProducesResponseType(StatusCodes.Status204NoContent)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<IActionResult> SetStatus(int roleId, [FromBody] UpdateRoleStatusRequest request, CancellationToken ct)
+    {
+        await _roles.SetStatusAsync(roleId, request.Status, ct);
+        return NoContent();
+    }
+
+    [HttpDelete("{roleId:int}")]
+    [ProducesResponseType(StatusCodes.Status204NoContent)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    public async Task<IActionResult> Delete(int roleId, CancellationToken ct)
+    {
+        await _roles.DeleteAsync(roleId, ct);
+        return NoContent();
+    }
+
+    [HttpGet("{roleId:int}/permissions")]
+    [ProducesResponseType(typeof(RolePermissionsDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<RolePermissionsDto>> GetPermissions(int roleId, CancellationToken ct)
+        => Ok(await _roles.GetPermissionsAsync(roleId, ct));
+
+    [HttpPut("{roleId:int}/permissions")]
+    [ProducesResponseType(typeof(RolePermissionsDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<RolePermissionsDto>> AssignPermissions(
+        int roleId, [FromBody] AssignRolePermissionsRequest request, CancellationToken ct)
+        => Ok(await _roles.AssignPermissionsAsync(roleId, request, ct));
+}

Backend/ERPCore/Controllers/UsersController.cs

@@ -0,0 +1,53 @@
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Users;
+using ERPCore.Services.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ERPCore.Controllers;
+
+/// <summary>
+/// User management: local shadow `User` list/detail + role assignment, and
+/// account creation orchestrated against AuthHex (see <see cref="IUserManagementService.CreateAsync"/>).
+/// </summary>
+[Route("api/v1/users")]
+public sealed class UsersController : ApiControllerBase
+{
+    private readonly IUserManagementService _users;
+
+    public UsersController(IUserManagementService users) => _users = users;
+
+    [HttpGet]
+    [ProducesResponseType(typeof(PagedResponse<ManagedUserDto>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<PagedResponse<ManagedUserDto>>> List([FromQuery] PageQuery query, CancellationToken ct)
+        => Ok(await _users.ListAsync(query, ct));
+
+    /// <summary>AuthHex UserType options for the create-user form's select.</summary>
+    [HttpGet("user-types")]
+    [ProducesResponseType(typeof(List<UserTypeOptionDto>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<List<UserTypeOptionDto>>> ListUserTypes(CancellationToken ct)
+        => Ok(await _users.ListUserTypesAsync(ct));
+
+    [HttpGet("{userId:int}")]
+    [ProducesResponseType(typeof(ManagedUserDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<ManagedUserDto>> GetById(int userId, CancellationToken ct)
+    {
+        var result = await _users.GetAsync(userId, ct);
+        return result is null ? NotFound() : Ok(result);
+    }
+
+    [HttpPost]
+    [ProducesResponseType(typeof(ManagedUserDto), StatusCodes.Status201Created)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    public async Task<ActionResult<ManagedUserDto>> Create([FromBody] CreateUserRequest request, CancellationToken ct)
+    {
+        var result = await _users.CreateAsync(request, ct);
+        return Created($"/api/v1/users/{result.UserId}", result);
+    }
+
+    [HttpPut("{userId:int}/role")]
+    [ProducesResponseType(typeof(ManagedUserDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<ManagedUserDto>> UpdateRole(int userId, [FromBody] UpdateUserRoleRequest request, CancellationToken ct)
+        => Ok(await _users.UpdateRoleAsync(userId, request, ct));
+}

Backend/ERPCore/Domain/Entities/GrnLine.cs

@@ -3,9 +3,13 @@ using ERPCore.Domain.Enums;
 namespace ERPCore.Domain.Entities;
 
 /// <summary>
-/// GRN line (FR-GRN-04..08). <see cref="UnitCost"/> is the PO-derived cost for
-/// PO-based receipts (client cost ignored — 02-SECURITY C.3) or the entered cost
-/// for direct receipts. <see cref="ReceivedValue"/> = qty × unitCost.
+/// GRN line (FR-GRN-04..08). <see cref="UnitCost"/> is the gross cost received at:
+/// entered on the line, defaulting to the PO price when omitted (a per-receipt price
+/// override is now permitted — see docs/02-SECURITY C.3, revised). <see cref="PoUnitPrice"/>
+/// snapshots the PO price at receipt so the variance survives later PO edits.
+/// <see cref="NetUnitCost"/> = unitCost after trade discount — this is what the FIFO layer
+/// costs at (VAT never enters stock value; it is recoverable input tax).
+/// <see cref="ReceivedValue"/> = qty × netUnitCost (after discount, before VAT).
 /// <see cref="HoldStatus"/> gates issuability. Model: docs/10 Part C.3.
 /// </summary>
 public class GrnLine
@@ -31,7 +35,30 @@ public class GrnLine
     public Batch? Batch { get; set; }
 
     public decimal Qty { get; set; }
+
+    /// <summary>Gross unit cost received at (entered, or PO price when omitted).</summary>
     public decimal UnitCost { get; set; }
+
+    /// <summary>Snapshot of the PO line price at receipt; null for direct receipts.</summary>
+    public decimal? PoUnitPrice { get; set; }
+
+    /// <summary>Trade discount percentage (0–100), entered.</summary>
+    public decimal DiscountPct { get; set; }
+
+    /// <summary>UnitCost × (1 − DiscountPct/100) — the inventory (FIFO layer) cost.</summary>
+    public decimal NetUnitCost { get; set; }
+
+    /// <summary>VAT percentage (0–100), entered. Recoverable — does not affect stock value.</summary>
+    public decimal VatPct { get; set; }
+
+    /// <summary>Qty × NetUnitCost × VatPct/100.</summary>
+    public decimal VatAmount { get; set; }
+
+    /// <summary>Qty × NetUnitCost (after discount, before VAT).</summary>
     public decimal ReceivedValue { get; set; }
+
+    /// <summary>Qty × NetUnitCost + VatAmount — payable to the vendor.</summary>
+    public decimal LineTotal { get; set; }
+
     public HoldStatus HoldStatus { get; set; } = HoldStatus.Available;
 }

Backend/ERPCore/Domain/Entities/Item.cs

@@ -33,6 +33,14 @@ public class Item
     public StockNature StockNature { get; set; }
     public TrackingMode TrackingMode { get; set; }
     public string? TaxClass { get; set; }
+
+    /// <summary>
+    /// Optional fixed selling price used by Sales only. <c>null</c> means "use stock value"
+    /// (the item is sold at its FIFO stock cost at sale time); a value is the fixed sale price.
+    /// Never enters costing/GRN/FIFO (docs/10 Part C.1, C.9).
+    /// </summary>
+    public decimal? SalePrice { get; set; }
+
     public EntityStatus Status { get; set; } = EntityStatus.Active;
 
     public DateTime CreatedAt { get; set; }

Backend/ERPCore/Domain/Entities/NavItem.cs

@@ -0,0 +1,22 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+/// <summary>
+/// A top-level sidebar entry (mirrors the frontend's hardcoded nav list,
+/// components/Layouts/AppSidebar.tsx). Seeded to match the current app routes;
+/// per-role visibility is controlled via <see cref="Permission"/>/<see cref="RolePermission"/>,
+/// not by editing these rows through the UI.
+/// </summary>
+public class NavItem
+{
+    public int NavItemId { get; set; }
+    public string Code { get; set; } = string.Empty;
+    public string Label { get; set; } = string.Empty;
+    public string? Icon { get; set; }
+    public string? Href { get; set; }
+    public int SortOrder { get; set; }
+    public EntityStatus Status { get; set; } = EntityStatus.Active;
+
+    public ICollection<SubNavItem> Children { get; set; } = new List<SubNavItem>();
+}

Backend/ERPCore/Domain/Entities/Permission.cs

@@ -0,0 +1,18 @@
+namespace ERPCore.Domain.Entities;
+
+/// <summary>
+/// A grantable sidebar-visibility unit — exactly one of <see cref="NavItemId"/> /
+/// <see cref="SubNavItemId"/> is set (enforced in <c>NavSeedService</c>/service layer,
+/// not by a DB constraint). One row is seeded per <see cref="NavItem"/>/<see cref="SubNavItem"/>;
+/// <see cref="RolePermission"/> grants it to a role.
+/// </summary>
+public class Permission
+{
+    public int PermissionId { get; set; }
+    public string Code { get; set; } = string.Empty;
+    public int? NavItemId { get; set; }
+    public int? SubNavItemId { get; set; }
+
+    public NavItem? NavItem { get; set; }
+    public SubNavItem? SubNavItem { get; set; }
+}

Backend/ERPCore/Domain/Entities/PoLine.cs

@@ -22,7 +22,7 @@ public class PoLine
     public Warehouse? Warehouse { get; set; }
 
     public decimal Qty { get; set; }
-    public decimal UnitPrice { get; set; }
+    public decimal UnitPrice { get; set; }//
     public decimal Tax { get; set; }
     public decimal QtyReceived { get; set; }
 }

Backend/ERPCore/Domain/Entities/Role.cs

@@ -0,0 +1,27 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+/// <summary>
+/// Local shadow/projection of an AuthHex <c>Role</c> row, mirroring the same
+/// pattern <see cref="User"/> uses for AuthHex identities: <see cref="AuthRoleId"/>
+/// maps to AuthHex's Guid <c>RoleId</c>, while the local <see cref="RoleId"/> (int)
+/// is what <see cref="Permission"/>/<see cref="RolePermission"/>/<see cref="User.RoleId"/>
+/// FKs reference. AuthHex remains the source of truth; writes are forwarded there
+/// first (<c>IAuthHexClient</c>) and mirrored here on success.
+/// </summary>
+public class Role
+{
+    public int RoleId { get; set; }
+    public Guid AuthRoleId { get; set; }
+    public string Code { get; set; } = string.Empty;
+    public string Name { get; set; } = string.Empty;
+    public bool IsSystemRole { get; set; }
+    public EntityStatus Status { get; set; } = EntityStatus.Active;
+
+    public DateTime CreatedAt { get; set; }
+    public DateTime? UpdatedAt { get; set; }
+
+    /// <summary>PostgreSQL xmin-backed optimistic concurrency token (ETag source).</summary>
+    public uint RowVersion { get; set; }
+}

Backend/ERPCore/Domain/Entities/RolePermission.cs

@@ -0,0 +1,11 @@
+namespace ERPCore.Domain.Entities;
+
+/// <summary>Join row granting a <see cref="Role"/> visibility of a <see cref="Permission"/> (nav node).</summary>
+public class RolePermission
+{
+    public int RoleId { get; set; }
+    public int PermissionId { get; set; }
+
+    public Role? Role { get; set; }
+    public Permission? Permission { get; set; }
+}

Backend/ERPCore/Domain/Entities/SubNavItem.cs

@@ -0,0 +1,18 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+/// <summary>A child sidebar entry under a <see cref="NavItem"/> (e.g. Products' children).</summary>
+public class SubNavItem
+{
+    public int SubNavItemId { get; set; }
+    public int NavItemId { get; set; }
+    public string Code { get; set; } = string.Empty;
+    public string Label { get; set; } = string.Empty;
+    public string? Icon { get; set; }
+    public string? Href { get; set; }
+    public int SortOrder { get; set; }
+    public EntityStatus Status { get; set; } = EntityStatus.Active;
+
+    public NavItem? NavItem { get; set; }
+}

Backend/ERPCore/Domain/Entities/User.cs

@@ -22,4 +22,8 @@ public class User
 
     /// <summary>AuthHex identity (token <c>UserId</c> GUID); null for the seeded system user.</summary>
     public Guid? AuthUserId { get; set; }
+
+    /// <summary>Local shadow <see cref="Role"/> assignment; null until an admin assigns one.</summary>
+    public int? RoleId { get; set; }
+    public Role? Role { get; set; }
 }

Backend/ERPCore/Dtos/Auth/AuthRoleDtos.cs

@@ -0,0 +1,28 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace ERPCore.Dtos.Auth;
+
+/// <summary>AuthHex's Role projection (ERP_Auth_Service/API_DOCUMENTATION.md, RoleManager section).</summary>
+public sealed class AuthHexRoleDto
+{
+    public Guid RoleId { get; set; }
+    public string? Code { get; set; }
+    public string? Name { get; set; }
+    public bool? IsSystemRole { get; set; }
+    public DateTime CreatedAt { get; set; }
+}
+
+public sealed class CreateAuthHexRoleRequest
+{
+    [Required] public string Code { get; set; } = string.Empty;
+    public string? Name { get; set; }
+    public bool? IsSystemRole { get; set; }
+}
+
+public sealed class UpdateAuthHexRoleRequest
+{
+    [Required] public Guid RoleId { get; set; }
+    public string? Code { get; set; }
+    public string? Name { get; set; }
+    public bool? IsSystemRole { get; set; }
+}

Backend/ERPCore/Dtos/Auth/AuthUserDtos.cs

@@ -82,6 +82,14 @@ public sealed class GetUserDetailsResponse
     public JsonElement? UserType { get; set; }
 }
 
+/// <summary>AuthHex's UserType lookup (ERP_Auth_Service/API_DOCUMENTATION.md, listUserTypes).</summary>
+public sealed class UserTypeDto
+{
+    public Guid UserTypeId { get; set; }
+    public string? Code { get; set; }
+    public string? Description { get; set; }
+}
+
 public sealed class SessionDto
 {
     public string? SessionId { get; set; }

Backend/ERPCore/Dtos/Grn/GrnDtos.cs

@@ -7,7 +7,10 @@ namespace ERPCore.Dtos.Grn;
 
 public sealed record GrnLineDto(
     int GrnLineId, int? PoLineId, int ItemId, int UomId, int? BinId,
-    decimal Qty, decimal UnitCost, decimal ReceivedValue, HoldStatus HoldStatus, int? BatchId);
+    decimal Qty, decimal UnitCost, decimal? PoUnitPrice,
+    decimal DiscountPct, decimal NetUnitCost, decimal VatPct, decimal VatAmount,
+    decimal ReceivedValue, decimal LineTotal, decimal PriceVariance,
+    HoldStatus HoldStatus, int? BatchId);
 
 public sealed record GrnDto(
     int GrnId, string DocNo, int? PoId, int VendorId, int WarehouseId, GrnStatus Status,
@@ -44,8 +47,16 @@ public sealed class CreateGrnLineInput
     [Required] public int UomId { get; set; }
     public int? BinId { get; set; }
     [Range(0.0001, double.MaxValue)] public decimal Qty { get; set; }
-    /// <summary>Used only for direct (no-PO) receipts; ignored when <see cref="PoLineId"/> is set.</summary>
+    /// <summary>
+    /// Gross unit cost. Required for direct (no-PO) receipts. For a PO line it is an optional
+    /// per-receipt price override — when 0/omitted the PO line price is used; when supplied it
+    /// wins and a variance is recorded against the PO snapshot (docs/02-SECURITY C.3, revised).
+    /// </summary>
     [Range(0, double.MaxValue)] public decimal UnitCost { get; set; }
+    /// <summary>Trade discount percentage (0–100). Reduces the inventory cost.</summary>
+    [Range(0, 100)] public decimal DiscountPct { get; set; }
+    /// <summary>VAT percentage (0–100). Recoverable — does not affect stock value.</summary>
+    [Range(0, 100)] public decimal VatPct { get; set; }
     [EnumDataType(typeof(HoldStatus))] public HoldStatus HoldStatus { get; set; } = HoldStatus.Available;
     public BatchInput? Batch { get; set; }
 }

Backend/ERPCore/Dtos/Items/ItemDtos.cs

@@ -9,7 +9,7 @@ namespace ERPCore.Dtos.Items;
 public sealed record ItemListItemDto(
     int ItemId, string Sku, string Name, int CategoryId, int? SubCategoryId, int? BrandId,
     int BaseUomId, int? DefaultVendorId, StockNature StockNature, TrackingMode TrackingMode,
-    string? TaxClass, EntityStatus Status);
+    string? TaxClass, decimal? SalePrice, EntityStatus Status);
 
 /// <summary>A single per-warehouse reorder policy row.</summary>
 public sealed record ItemReorderDto(int WarehouseId, decimal ReorderPoint, decimal ReorderQty);
@@ -27,7 +27,7 @@ public sealed record ItemDetailDto(
     int ItemId, string Sku, string Name, string? Description, int CategoryId,
     int? SubCategoryId, int? BrandId, int BaseUomId, int? DefaultVendorId,
     StockNature StockNature, TrackingMode TrackingMode,
-    string? TaxClass, EntityStatus Status, IReadOnlyList<ItemReorderDto> Reorder,
+    string? TaxClass, decimal? SalePrice, EntityStatus Status, IReadOnlyList<ItemReorderDto> Reorder,
     IReadOnlyList<UomConversionDto> Conversions,
     DateTime CreatedAt, DateTime? UpdatedAt);
 
@@ -62,6 +62,8 @@ public sealed class CreateItemRequest
     [Required, EnumDataType(typeof(StockNature))] public StockNature StockNature { get; set; }
     [EnumDataType(typeof(TrackingMode))] public TrackingMode TrackingMode { get; set; } = TrackingMode.None;
     [StringLength(20)] public string? TaxClass { get; set; }
+    /// <summary>Optional fixed sale price (Sales only). Null ⇒ sell at stock/FIFO value.</summary>
+    [Range(0, double.MaxValue)] public decimal? SalePrice { get; set; }
 }
 
 public sealed class UpdateItemRequest
@@ -79,6 +81,8 @@ public sealed class UpdateItemRequest
     [Required, EnumDataType(typeof(StockNature))] public StockNature StockNature { get; set; }
     [EnumDataType(typeof(TrackingMode))] public TrackingMode TrackingMode { get; set; } = TrackingMode.None;
     [StringLength(20)] public string? TaxClass { get; set; }
+    /// <summary>Optional fixed sale price (Sales only). Null ⇒ sell at stock/FIFO value.</summary>
+    [Range(0, double.MaxValue)] public decimal? SalePrice { get; set; }
 }
 
 public sealed class UpdateItemStatusRequest

Backend/ERPCore/Dtos/Procurement/PurchaseOrderDtos.cs

@@ -37,6 +37,13 @@ public sealed class CreatePurchaseOrderRequest
     [Required] public int VendorId { get; set; }
     public int? RequisitionId { get; set; }
     [Required, MinLength(1)] public List<CreatePoLineInput> Lines { get; set; } = new();
+
+    /// <summary>
+    /// When true the PO is created in <c>Draft</c> (editable/deletable, not yet issued).
+    /// When false (default) it auto-approves on creation, preserving the Requisition→PO
+    /// and RFQ→PO flows unchanged (docs/11 §3.3).
+    /// </summary>
+    public bool SaveAsDraft { get; set; }
 }
 
 public sealed class UpdatePurchaseOrderRequest

Backend/ERPCore/Dtos/Rbac/MeDtos.cs

@@ -0,0 +1,6 @@
+namespace ERPCore.Dtos.Rbac;
+
+/// <summary>Response for `GET /api/v1/auth/me` — the frontend's authoritative source
+/// for the current user's role and permitted sidebar nav codes (replaces trusting
+/// the stale, client-only `roleId` cached in localStorage).</summary>
+public sealed record MeResponseDto(string? RoleCode, string? RoleName, IReadOnlyList<string> NavCodes);

Backend/ERPCore/Dtos/Rbac/NavDtos.cs

@@ -0,0 +1,7 @@
+namespace ERPCore.Dtos.Rbac;
+
+public sealed record SubNavItemDto(int SubNavItemId, string Code, string Label, string? Icon, string? Href, int SortOrder);
+
+public sealed record NavItemDto(
+    int NavItemId, string Code, string Label, string? Icon, string? Href, int SortOrder,
+    IReadOnlyList<SubNavItemDto> Children);

Backend/ERPCore/Dtos/Rbac/RoleDtos.cs

@@ -0,0 +1,34 @@
+using System.ComponentModel.DataAnnotations;
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Dtos.Rbac;
+
+public sealed record RoleDto(
+    int RoleId, string Code, string Name, bool IsSystemRole, EntityStatus Status,
+    DateTime CreatedAt, DateTime? UpdatedAt);
+
+public sealed class CreateRoleRequest
+{
+    [Required, StringLength(50)] public string Code { get; set; } = string.Empty;
+    [Required, StringLength(200)] public string Name { get; set; } = string.Empty;
+}
+
+public sealed class UpdateRoleRequest
+{
+    [Required, StringLength(50)] public string Code { get; set; } = string.Empty;
+    [Required, StringLength(200)] public string Name { get; set; } = string.Empty;
+}
+
+public sealed class UpdateRoleStatusRequest
+{
+    [Required, EnumDataType(typeof(EntityStatus))] public EntityStatus Status { get; set; }
+}
+
+/// <summary>Replaces a role's full permission set (checkbox-tree save from the frontend).</summary>
+public sealed class AssignRolePermissionsRequest
+{
+    public List<int> NavItemIds { get; set; } = new();
+    public List<int> SubNavItemIds { get; set; } = new();
+}
+
+public sealed record RolePermissionsDto(int RoleId, List<int> NavItemIds, List<int> SubNavItemIds);

Backend/ERPCore/Dtos/Users/UserDtos.cs

@@ -0,0 +1,35 @@
+using System.ComponentModel.DataAnnotations;
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Dtos.Users;
+
+public sealed record ManagedUserDto(
+    int UserId, string Username, string DisplayName, EntityStatus Status,
+    int? RoleId, string? RoleCode, string? RoleName);
+
+/// <summary>
+/// Creates a user in both backends: forwards to AuthHex's `registerUser` (source
+/// of truth for credentials), then mirrors the account into ERPCore's local
+/// shadow `User` row immediately (rather than waiting for next-login JIT
+/// provisioning). AuthHex emails the generated/supplied password to `Email`.
+/// </summary>
+public sealed class CreateUserRequest
+{
+    [Required, StringLength(100)] public string Username { get; set; } = string.Empty;
+    [Required, StringLength(200)] public string FullName { get; set; } = string.Empty;
+    [Required] public int RoleId { get; set; }
+    [Required] public Guid UserTypeId { get; set; }
+    [Required, EmailAddress] public string Email { get; set; } = string.Empty;
+    public string? Nic { get; set; }
+    public string? MobileNumber { get; set; }
+    /// <summary>Left empty to auto-generate (AuthHex emails it to <see cref="Email"/>).</summary>
+    public string? Password { get; set; }
+}
+
+public sealed class UpdateUserRoleRequest
+{
+    [Required] public int RoleId { get; set; }
+}
+
+/// <summary>AuthHex UserType lookup, for populating the create-user form's select (no local shadow — read-only passthrough).</summary>
+public sealed record UserTypeOptionDto(Guid UserTypeId, string? Code, string? Description);

Backend/ERPCore/Infra/Auth/AuthHex/AuthHexClient.cs

@@ -1,6 +1,7 @@
 using System.Net.Http.Headers;
 using System.Net.Http.Json;
 using System.Text.Json;
+using System.Text.Json.Serialization;
 using ERPCore.Dtos.Auth;
 using ERPCore.System.Errors;
 
@@ -16,9 +17,14 @@ namespace ERPCore.Infra.Auth.AuthHex;
 /// </summary>
 public sealed class AuthHexClient : IAuthHexClient
 {
+    // WhenWritingNull: AuthHex's dispatcher reads payload fields as raw JsonElements and some
+    // (e.g. RoleManager's isSystemRole) call type-specific getters like GetBoolean() that throw
+    // on an explicit JSON null rather than treating it as "absent" — omit null properties instead
+    // of serializing them, so unset nullable request fields behave as ContainsKey == false upstream.
     private static readonly JsonSerializerOptions JsonOptions = new(JsonSerializerDefaults.Web)
     {
-        PropertyNameCaseInsensitive = true
+        PropertyNameCaseInsensitive = true,
+        DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull
     };
 
     private readonly HttpClient _http;
@@ -42,6 +48,9 @@ public sealed class AuthHexClient : IAuthHexClient
     public Task<GetUserDetailsResponse> GetUserDetailsAsync(Guid userId, CancellationToken ct)
         => CallAsync<GetUserDetailsResponse>("user", "getUserDetails", new { userId }, null, ct);
 
+    public Task<List<UserTypeDto>> ListUserTypesAsync(CancellationToken ct)
+        => CallAsync<List<UserTypeDto>>("user", "listUserTypes", new { }, null, ct);
+
     public Task<List<SessionDto>> GetUserSessionsAsync(string bearerToken, CancellationToken ct)
         => CallAsync<List<SessionDto>>("user", "getUserSessions", new { }, bearerToken, ct);
 
@@ -103,6 +112,23 @@ public sealed class AuthHexClient : IAuthHexClient
     public Task<AuthHexSessionResult> VerifyAltOtpAsync(VerifyAltOtpRequest request, CancellationToken ct)
         => CallAsync<AuthHexSessionResult>("alt", "VerifyOTP", request, null, ct);
 
+    // ---- RoleManager --------------------------------------------------
+
+    public Task<AuthHexRoleDto> CreateRoleAsync(CreateAuthHexRoleRequest request, CancellationToken ct)
+        => CallAsync<AuthHexRoleDto>("role", "createRole", request, null, ct);
+
+    public Task<List<AuthHexRoleDto>> ListRolesAsync(CancellationToken ct)
+        => CallAsync<List<AuthHexRoleDto>>("role", "listRoles", new { }, null, ct);
+
+    public Task<AuthHexRoleDto> GetRoleAsync(Guid roleId, CancellationToken ct)
+        => CallAsync<AuthHexRoleDto>("role", "getRole", new { roleId }, null, ct);
+
+    public Task<AuthHexRoleDto> UpdateRoleAsync(UpdateAuthHexRoleRequest request, CancellationToken ct)
+        => CallAsync<AuthHexRoleDto>("role", "updateRole", request, null, ct);
+
+    public Task DeleteRoleAsync(Guid roleId, CancellationToken ct)
+        => CallVoidAsync("role", "deleteRole", new { roleId }, null, ct);
+
     // ---- Transport --------------------------------------------------------
 
     private async Task CallVoidAsync(string routeGroup, string functionName, object payload, string? bearerToken, CancellationToken ct)

Backend/ERPCore/Infra/Auth/AuthHex/IAuthHexClient.cs

@@ -16,6 +16,7 @@ public interface IAuthHexClient
     Task<AuthHexSessionResult> VerifyOtpForLoginAsync(VerifyOtpForLoginRequest request, CancellationToken ct);
     Task<AuthHexSessionResult> RefreshTokenAsync(string refreshToken, string? deviceName, CancellationToken ct);
     Task<GetUserDetailsResponse> GetUserDetailsAsync(Guid userId, CancellationToken ct);
+    Task<List<UserTypeDto>> ListUserTypesAsync(CancellationToken ct);
     Task<List<SessionDto>> GetUserSessionsAsync(string bearerToken, CancellationToken ct);
     Task ChangeUserStatusAsync(bool isActive, string bearerToken, CancellationToken ct);
     Task LockUserAccountAsync(bool isLocked, string bearerToken, CancellationToken ct);
@@ -39,4 +40,12 @@ public interface IAuthHexClient
     Task<IsAvailableResponse> IsAvailableAsync(IsAvailableRequest request, CancellationToken ct);
     Task<SendOtpResponse> SendOtpAsync(SendOtpRequest request, CancellationToken ct);
     Task<AuthHexSessionResult> VerifyAltOtpAsync(VerifyAltOtpRequest request, CancellationToken ct);
+
+    // RoleManager (POST /api/role) — AuthHex is the source of truth for Role;
+    // ERPCore mirrors the result into a local shadow Role row (see RoleService).
+    Task<AuthHexRoleDto> CreateRoleAsync(CreateAuthHexRoleRequest request, CancellationToken ct);
+    Task<List<AuthHexRoleDto>> ListRolesAsync(CancellationToken ct);
+    Task<AuthHexRoleDto> GetRoleAsync(Guid roleId, CancellationToken ct);
+    Task<AuthHexRoleDto> UpdateRoleAsync(UpdateAuthHexRoleRequest request, CancellationToken ct);
+    Task DeleteRoleAsync(Guid roleId, CancellationToken ct);
 }

Backend/ERPCore/Infra/Persistence/Configurations/GrnConfiguration.cs

@@ -37,7 +37,13 @@ public sealed class GrnLineConfiguration : IEntityTypeConfiguration<GrnLine>
 
         builder.Property(l => l.Qty).HasPrecision(18, 4);
         builder.Property(l => l.UnitCost).HasPrecision(18, 6);
+        builder.Property(l => l.PoUnitPrice).HasPrecision(18, 6);
+        builder.Property(l => l.DiscountPct).HasPrecision(9, 4);
+        builder.Property(l => l.NetUnitCost).HasPrecision(18, 6);
+        builder.Property(l => l.VatPct).HasPrecision(9, 4);
+        builder.Property(l => l.VatAmount).HasPrecision(18, 4);
         builder.Property(l => l.ReceivedValue).HasPrecision(18, 4);
+        builder.Property(l => l.LineTotal).HasPrecision(18, 4);
         builder.Property(l => l.HoldStatus).HasConversion<string>().HasMaxLength(20).IsRequired();
 
         builder.HasOne(l => l.Grn).WithMany(g => g.Lines).HasForeignKey(l => l.GrnId).OnDelete(DeleteBehavior.Cascade);

Backend/ERPCore/Infra/Persistence/Configurations/ItemConfiguration.cs

@@ -19,6 +19,9 @@ public sealed class ItemConfiguration : IEntityTypeConfiguration<Item>
         builder.Property(i => i.Description).HasMaxLength(1000);
         builder.Property(i => i.TaxClass).HasMaxLength(20);
 
+        // Sales-only fixed selling price; nullable (null ⇒ sell at stock/FIFO value).
+        builder.Property(i => i.SalePrice).HasPrecision(18, 4);
+
         builder.Property(i => i.StockNature)
             .HasConversion<string>().HasMaxLength(20).IsRequired();
         builder.Property(i => i.TrackingMode)

Backend/ERPCore/Infra/Persistence/Configurations/NavItemConfiguration.cs

@@ -0,0 +1,42 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+/// <summary>
+/// Seeded to mirror the frontend's hardcoded sidebar
+/// (ERP-core/Frontend/erp-system/components/Layouts/AppSidebar.tsx). Codes here
+/// must match the <c>code</c> given to each frontend nav entry.
+/// </summary>
+public sealed class NavItemConfiguration : IEntityTypeConfiguration<NavItem>
+{
+    public void Configure(EntityTypeBuilder<NavItem> builder)
+    {
+        builder.ToTable("nav_items");
+        builder.HasKey(n => n.NavItemId);
+
+        builder.Property(n => n.Code).IsRequired().HasMaxLength(50);
+        builder.HasIndex(n => n.Code).IsUnique();
+        builder.Property(n => n.Label).IsRequired().HasMaxLength(100);
+        builder.Property(n => n.Icon).HasMaxLength(50);
+        builder.Property(n => n.Href).HasMaxLength(200);
+        builder.Property(n => n.Status)
+            .HasConversion<string>().HasMaxLength(20).IsRequired()
+            .HasDefaultValue(EntityStatus.Active);
+
+        builder.HasData(
+            new NavItem { NavItemId = 1, Code = "dashboard", Label = "Dashboard", Href = "/dashboard", SortOrder = 1 },
+            new NavItem { NavItemId = 2, Code = "products", Label = "Products", Href = "/dashboard/products", SortOrder = 2 },
+            new NavItem { NavItemId = 3, Code = "vendors", Label = "Vendors", Href = "/dashboard/vendors", SortOrder = 3 },
+            new NavItem { NavItemId = 4, Code = "procurement", Label = "Procurement", Href = "/dashboard/procurement", SortOrder = 4 },
+            new NavItem { NavItemId = 5, Code = "receiving", Label = "Receiving", Href = "/dashboard/receiving/grn", SortOrder = 5 },
+            new NavItem { NavItemId = 6, Code = "stock", Label = "Stock", Href = "/dashboard/stock", SortOrder = 6 },
+            new NavItem { NavItemId = 7, Code = "warehouses", Label = "Warehouses", Href = "/dashboard/warehouse", SortOrder = 7 },
+            new NavItem { NavItemId = 8, Code = "orders", Label = "Orders", Href = "/dashboard/orders", SortOrder = 8 },
+            new NavItem { NavItemId = 9, Code = "settings", Label = "Settings", Href = "/dashboard/settings", SortOrder = 9 },
+            new NavItem { NavItemId = 10, Code = "help", Label = "Help", Href = "/dashboard/help", SortOrder = 10 }
+        );
+    }
+}

Backend/ERPCore/Infra/Persistence/Configurations/PermissionConfiguration.cs

@@ -0,0 +1,51 @@
+using ERPCore.Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+/// <summary>
+/// One row per <see cref="NavItem"/>/<see cref="SubNavItem"/>, seeded in lockstep
+/// with <see cref="NavItemConfiguration"/>/<see cref="SubNavItemConfiguration"/>.
+/// </summary>
+public sealed class PermissionConfiguration : IEntityTypeConfiguration<Permission>
+{
+    public void Configure(EntityTypeBuilder<Permission> builder)
+    {
+        builder.ToTable("permissions");
+        builder.HasKey(p => p.PermissionId);
+
+        builder.Property(p => p.Code).IsRequired().HasMaxLength(80);
+        builder.HasIndex(p => p.Code).IsUnique();
+
+        builder.HasOne(p => p.NavItem).WithMany()
+            .HasForeignKey(p => p.NavItemId).OnDelete(DeleteBehavior.Cascade);
+        builder.HasOne(p => p.SubNavItem).WithMany()
+            .HasForeignKey(p => p.SubNavItemId).OnDelete(DeleteBehavior.Cascade);
+
+        builder.HasData(
+            new Permission { PermissionId = 1, Code = "NAV:dashboard", NavItemId = 1 },
+            new Permission { PermissionId = 2, Code = "NAV:products", NavItemId = 2 },
+            new Permission { PermissionId = 3, Code = "NAV:vendors", NavItemId = 3 },
+            new Permission { PermissionId = 4, Code = "NAV:procurement", NavItemId = 4 },
+            new Permission { PermissionId = 5, Code = "NAV:receiving", NavItemId = 5 },
+            new Permission { PermissionId = 6, Code = "NAV:stock", NavItemId = 6 },
+            new Permission { PermissionId = 7, Code = "NAV:warehouses", NavItemId = 7 },
+            new Permission { PermissionId = 8, Code = "NAV:orders", NavItemId = 8 },
+            new Permission { PermissionId = 9, Code = "NAV:settings", NavItemId = 9 },
+            new Permission { PermissionId = 10, Code = "NAV:help", NavItemId = 10 },
+            new Permission { PermissionId = 11, Code = "NAV:products.item", SubNavItemId = 1 },
+            new Permission { PermissionId = 12, Code = "NAV:products.category", SubNavItemId = 2 },
+            new Permission { PermissionId = 13, Code = "NAV:products.brand", SubNavItemId = 3 },
+            new Permission { PermissionId = 14, Code = "NAV:products.item-type", SubNavItemId = 4 },
+            new Permission { PermissionId = 15, Code = "NAV:products.uom", SubNavItemId = 5 },
+            new Permission { PermissionId = 16, Code = "NAV:products.configuration", SubNavItemId = 6 },
+            new Permission { PermissionId = 17, Code = "NAV:settings.roles", SubNavItemId = 7 },
+            new Permission { PermissionId = 18, Code = "NAV:settings.users", SubNavItemId = 8 },
+            new Permission { PermissionId = 19, Code = "NAV:procurement.requisitions", SubNavItemId = 9 },
+            new Permission { PermissionId = 20, Code = "NAV:procurement.rfqs", SubNavItemId = 10 },
+            new Permission { PermissionId = 21, Code = "NAV:procurement.purchase-orders", SubNavItemId = 11 },
+            new Permission { PermissionId = 22, Code = "NAV:procurement.purchase-returns", SubNavItemId = 12 }
+        );
+    }
+}

Backend/ERPCore/Infra/Persistence/Configurations/RoleConfiguration.cs

@@ -0,0 +1,33 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+public sealed class RoleConfiguration : IEntityTypeConfiguration<Role>
+{
+    public void Configure(EntityTypeBuilder<Role> builder)
+    {
+        builder.ToTable("roles");
+        builder.HasKey(r => r.RoleId);
+
+        builder.Property(r => r.AuthRoleId).HasColumnName("auth_role_id").IsRequired();
+        builder.HasIndex(r => r.AuthRoleId).IsUnique();
+
+        builder.Property(r => r.Code).IsRequired().HasMaxLength(50);
+        builder.HasIndex(r => r.Code).IsUnique();
+
+        builder.Property(r => r.Name).IsRequired().HasMaxLength(200);
+        builder.Property(r => r.IsSystemRole).IsRequired().HasDefaultValue(false);
+
+        builder.Property(r => r.Status)
+            .HasConversion<string>().HasMaxLength(20).IsRequired()
+            .HasDefaultValue(EntityStatus.Active);
+
+        builder.Property(r => r.CreatedAt).IsRequired();
+
+        // PostgreSQL xmin system column as the optimistic concurrency token (ETag).
+        builder.Property(r => r.RowVersion).IsRowVersion();
+    }
+}

Backend/ERPCore/Infra/Persistence/Configurations/RolePermissionConfiguration.cs

@@ -0,0 +1,19 @@
+using ERPCore.Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+public sealed class RolePermissionConfiguration : IEntityTypeConfiguration<RolePermission>
+{
+    public void Configure(EntityTypeBuilder<RolePermission> builder)
+    {
+        builder.ToTable("role_permissions");
+        builder.HasKey(rp => new { rp.RoleId, rp.PermissionId });
+
+        builder.HasOne(rp => rp.Role).WithMany()
+            .HasForeignKey(rp => rp.RoleId).OnDelete(DeleteBehavior.Cascade);
+        builder.HasOne(rp => rp.Permission).WithMany()
+            .HasForeignKey(rp => rp.PermissionId).OnDelete(DeleteBehavior.Cascade);
+    }
+}

Backend/ERPCore/Infra/Persistence/Configurations/SubNavItemConfiguration.cs

@@ -0,0 +1,43 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+public sealed class SubNavItemConfiguration : IEntityTypeConfiguration<SubNavItem>
+{
+    public void Configure(EntityTypeBuilder<SubNavItem> builder)
+    {
+        builder.ToTable("sub_nav_items");
+        builder.HasKey(n => n.SubNavItemId);
+
+        builder.Property(n => n.Code).IsRequired().HasMaxLength(50);
+        builder.HasIndex(n => n.Code).IsUnique();
+        builder.Property(n => n.Label).IsRequired().HasMaxLength(100);
+        builder.Property(n => n.Icon).HasMaxLength(50);
+        builder.Property(n => n.Href).HasMaxLength(200);
+        builder.Property(n => n.Status)
+            .HasConversion<string>().HasMaxLength(20).IsRequired()
+            .HasDefaultValue(EntityStatus.Active);
+
+        builder.HasOne(n => n.NavItem).WithMany(n => n.Children)
+            .HasForeignKey(n => n.NavItemId).OnDelete(DeleteBehavior.Cascade);
+
+        builder.HasData(
+            new SubNavItem { SubNavItemId = 1, NavItemId = 2, Code = "products.item", Label = "Item", Href = "/dashboard/products", SortOrder = 1 },
+            new SubNavItem { SubNavItemId = 2, NavItemId = 2, Code = "products.category", Label = "Category", Href = "/dashboard/products/categories", SortOrder = 2 },
+            new SubNavItem { SubNavItemId = 3, NavItemId = 2, Code = "products.brand", Label = "Brand", Href = "/dashboard/products/brands", SortOrder = 3 },
+            new SubNavItem { SubNavItemId = 4, NavItemId = 2, Code = "products.item-type", Label = "Item Type", Href = "/dashboard/products/item-types", SortOrder = 4 },
+            new SubNavItem { SubNavItemId = 5, NavItemId = 2, Code = "products.uom", Label = "UOM", Href = "/dashboard/products/uoms", SortOrder = 5 },
+            new SubNavItem { SubNavItemId = 6, NavItemId = 2, Code = "products.configuration", Label = "Configuration", Href = "/dashboard/products/settings", SortOrder = 6 },
+            new SubNavItem { SubNavItemId = 7, NavItemId = 9, Code = "settings.roles", Label = "Roles", Href = "/dashboard/settings/roles", SortOrder = 1 },
+            new SubNavItem { SubNavItemId = 8, NavItemId = 9, Code = "settings.users", Label = "Users", Href = "/dashboard/settings/users", SortOrder = 2 },
+            // Procurement (NavItemId 4) children — mirror the hub page order.
+            new SubNavItem { SubNavItemId = 9, NavItemId = 4, Code = "procurement.requisitions", Label = "Requisitions", Href = "/dashboard/procurement/requisitions", SortOrder = 1 },
+            new SubNavItem { SubNavItemId = 10, NavItemId = 4, Code = "procurement.rfqs", Label = "RFQs", Href = "/dashboard/procurement/rfqs", SortOrder = 2 },
+            new SubNavItem { SubNavItemId = 11, NavItemId = 4, Code = "procurement.purchase-orders", Label = "Purchase Orders", Href = "/dashboard/procurement/purchase-orders", SortOrder = 3 },
+            new SubNavItem { SubNavItemId = 12, NavItemId = 4, Code = "procurement.purchase-returns", Label = "Purchase Returns", Href = "/dashboard/procurement/purchase-returns", SortOrder = 4 }
+        );
+    }
+}

Backend/ERPCore/Infra/Persistence/Configurations/UserConfiguration.cs

@@ -23,6 +23,10 @@ public sealed class UserConfiguration : IEntityTypeConfiguration<User>
         builder.Property(u => u.AuthUserId).HasColumnName("auth_user_id");
         builder.HasIndex(u => u.AuthUserId).IsUnique();
 
+        // Local shadow Role assignment (nullable — unset until an admin assigns one).
+        builder.HasOne(u => u.Role).WithMany()
+            .HasForeignKey(u => u.RoleId).OnDelete(DeleteBehavior.Restrict);
+
         // Seeded fallback audit actor while auth is deferred (§6).
         builder.HasData(new User
         {

Backend/ERPCore/Infra/Persistence/ErpDbContext.cs

@@ -41,6 +41,13 @@ public class ErpDbContext : DbContext
     public DbSet<User> Users => Set<User>();
     public DbSet<NumberSequence> NumberSequences => Set<NumberSequence>();
 
+    // --- RBAC / sidebar (docs/10 Part C.8) ---
+    public DbSet<Role> Roles => Set<Role>();
+    public DbSet<NavItem> NavItems => Set<NavItem>();
+    public DbSet<SubNavItem> SubNavItems => Set<SubNavItem>();
+    public DbSet<Permission> Permissions => Set<Permission>();
+    public DbSet<RolePermission> RolePermissions => Set<RolePermission>();
+
     // --- Procurement (docs/10 Part C.2) ---
     public DbSet<Requisition> Requisitions => Set<Requisition>();
     public DbSet<RequisitionLine> RequisitionLines => Set<RequisitionLine>();

Backend/ERPCore/Infra/Persistence/Migrations/20260718081219_ini2.cs

@@ -0,0 +1,22 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ERPCore.Infra.Persistence.Migrations
+{
+    /// <inheritdoc />
+    public partial class ini2 : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+
+        }
+    }
+}

Backend/ERPCore/Infra/Persistence/Migrations/20260718092655_AddRolesNavPermissions.cs

@@ -0,0 +1,303 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+#pragma warning disable CA1814 // Prefer jagged arrays over multidimensional
+
+namespace ERPCore.Infra.Persistence.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddRolesNavPermissions : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "RoleId",
+                table: "users",
+                type: "integer",
+                nullable: true);
+
+            migrationBuilder.CreateTable(
+                name: "nav_items",
+                columns: table => new
+                {
+                    NavItemId = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    Code = table.Column<string>(type: "character varying(50)", maxLength: 50, nullable: false),
+                    Label = table.Column<string>(type: "character varying(100)", maxLength: 100, nullable: false),
+                    Icon = table.Column<string>(type: "character varying(50)", maxLength: 50, nullable: true),
+                    Href = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: true),
+                    SortOrder = table.Column<int>(type: "integer", nullable: false),
+                    Status = table.Column<string>(type: "character varying(20)", maxLength: 20, nullable: false, defaultValue: "Active")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_nav_items", x => x.NavItemId);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "roles",
+                columns: table => new
+                {
+                    RoleId = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    auth_role_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    Code = table.Column<string>(type: "character varying(50)", maxLength: 50, nullable: false),
+                    Name = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: false),
+                    IsSystemRole = table.Column<bool>(type: "boolean", nullable: false, defaultValue: false),
+                    Status = table.Column<string>(type: "character varying(20)", maxLength: 20, nullable: false, defaultValue: "Active"),
+                    CreatedAt = table.Column<DateTime>(type: "timestamp with time zone", nullable: false),
+                    UpdatedAt = table.Column<DateTime>(type: "timestamp with time zone", nullable: true),
+                    xmin = table.Column<uint>(type: "xid", rowVersion: true, nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_roles", x => x.RoleId);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "sub_nav_items",
+                columns: table => new
+                {
+                    SubNavItemId = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    NavItemId = table.Column<int>(type: "integer", nullable: false),
+                    Code = table.Column<string>(type: "character varying(50)", maxLength: 50, nullable: false),
+                    Label = table.Column<string>(type: "character varying(100)", maxLength: 100, nullable: false),
+                    Icon = table.Column<string>(type: "character varying(50)", maxLength: 50, nullable: true),
+                    Href = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: true),
+                    SortOrder = table.Column<int>(type: "integer", nullable: false),
+                    Status = table.Column<string>(type: "character varying(20)", maxLength: 20, nullable: false, defaultValue: "Active")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_sub_nav_items", x => x.SubNavItemId);
+                    table.ForeignKey(
+                        name: "FK_sub_nav_items_nav_items_NavItemId",
+                        column: x => x.NavItemId,
+                        principalTable: "nav_items",
+                        principalColumn: "NavItemId",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "permissions",
+                columns: table => new
+                {
+                    PermissionId = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    Code = table.Column<string>(type: "character varying(80)", maxLength: 80, nullable: false),
+                    NavItemId = table.Column<int>(type: "integer", nullable: true),
+                    SubNavItemId = table.Column<int>(type: "integer", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_permissions", x => x.PermissionId);
+                    table.ForeignKey(
+                        name: "FK_permissions_nav_items_NavItemId",
+                        column: x => x.NavItemId,
+                        principalTable: "nav_items",
+                        principalColumn: "NavItemId",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "FK_permissions_sub_nav_items_SubNavItemId",
+                        column: x => x.SubNavItemId,
+                        principalTable: "sub_nav_items",
+                        principalColumn: "SubNavItemId",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "role_permissions",
+                columns: table => new
+                {
+                    RoleId = table.Column<int>(type: "integer", nullable: false),
+                    PermissionId = table.Column<int>(type: "integer", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_role_permissions", x => new { x.RoleId, x.PermissionId });
+                    table.ForeignKey(
+                        name: "FK_role_permissions_permissions_PermissionId",
+                        column: x => x.PermissionId,
+                        principalTable: "permissions",
+                        principalColumn: "PermissionId",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "FK_role_permissions_roles_RoleId",
+                        column: x => x.RoleId,
+                        principalTable: "roles",
+                        principalColumn: "RoleId",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.InsertData(
+                table: "nav_items",
+                columns: new[] { "NavItemId", "Code", "Href", "Icon", "Label", "SortOrder" },
+                values: new object[,]
+                {
+                    { 1, "dashboard", "/dashboard", null, "Dashboard", 1 },
+                    { 2, "products", "/dashboard/products", null, "Products", 2 },
+                    { 3, "vendors", "/dashboard/vendors", null, "Vendors", 3 },
+                    { 4, "procurement", "/dashboard/procurement", null, "Procurement", 4 },
+                    { 5, "receiving", "/dashboard/receiving/grn", null, "Receiving", 5 },
+                    { 6, "stock", "/dashboard/stock", null, "Stock", 6 },
+                    { 7, "warehouses", "/dashboard/warehouse", null, "Warehouses", 7 },
+                    { 8, "orders", "/dashboard/orders", null, "Orders", 8 },
+                    { 9, "settings", "/dashboard/settings", null, "Settings", 9 },
+                    { 10, "help", "/dashboard/help", null, "Help", 10 }
+                });
+
+            migrationBuilder.UpdateData(
+                table: "users",
+                keyColumn: "UserId",
+                keyValue: 1,
+                column: "RoleId",
+                value: null);
+
+            migrationBuilder.InsertData(
+                table: "permissions",
+                columns: new[] { "PermissionId", "Code", "NavItemId", "SubNavItemId" },
+                values: new object[,]
+                {
+                    { 1, "NAV:dashboard", 1, null },
+                    { 2, "NAV:products", 2, null },
+                    { 3, "NAV:vendors", 3, null },
+                    { 4, "NAV:procurement", 4, null },
+                    { 5, "NAV:receiving", 5, null },
+                    { 6, "NAV:stock", 6, null },
+                    { 7, "NAV:warehouses", 7, null },
+                    { 8, "NAV:orders", 8, null },
+                    { 9, "NAV:settings", 9, null },
+                    { 10, "NAV:help", 10, null }
+                });
+
+            migrationBuilder.InsertData(
+                table: "sub_nav_items",
+                columns: new[] { "SubNavItemId", "Code", "Href", "Icon", "Label", "NavItemId", "SortOrder" },
+                values: new object[,]
+                {
+                    { 1, "products.item", "/dashboard/products", null, "Item", 2, 1 },
+                    { 2, "products.category", "/dashboard/products/categories", null, "Category", 2, 2 },
+                    { 3, "products.brand", "/dashboard/products/brands", null, "Brand", 2, 3 },
+                    { 4, "products.item-type", "/dashboard/products/item-types", null, "Item Type", 2, 4 },
+                    { 5, "products.uom", "/dashboard/products/uoms", null, "UOM", 2, 5 },
+                    { 6, "products.configuration", "/dashboard/products/settings", null, "Configuration", 2, 6 },
+                    { 7, "settings.roles", "/dashboard/settings/roles", null, "Roles", 9, 1 },
+                    { 8, "settings.users", "/dashboard/settings/users", null, "Users", 9, 2 }
+                });
+
+            migrationBuilder.InsertData(
+                table: "permissions",
+                columns: new[] { "PermissionId", "Code", "NavItemId", "SubNavItemId" },
+                values: new object[,]
+                {
+                    { 11, "NAV:products.item", null, 1 },
+                    { 12, "NAV:products.category", null, 2 },
+                    { 13, "NAV:products.brand", null, 3 },
+                    { 14, "NAV:products.item-type", null, 4 },
+                    { 15, "NAV:products.uom", null, 5 },
+                    { 16, "NAV:products.configuration", null, 6 },
+                    { 17, "NAV:settings.roles", null, 7 },
+                    { 18, "NAV:settings.users", null, 8 }
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_users_RoleId",
+                table: "users",
+                column: "RoleId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_nav_items_Code",
+                table: "nav_items",
+                column: "Code",
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_permissions_Code",
+                table: "permissions",
+                column: "Code",
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_permissions_NavItemId",
+                table: "permissions",
+                column: "NavItemId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_permissions_SubNavItemId",
+                table: "permissions",
+                column: "SubNavItemId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_role_permissions_PermissionId",
+                table: "role_permissions",
+                column: "PermissionId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_roles_auth_role_id",
+                table: "roles",
+                column: "auth_role_id",
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_roles_Code",
+                table: "roles",
+                column: "Code",
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_sub_nav_items_Code",
+                table: "sub_nav_items",
+                column: "Code",
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_sub_nav_items_NavItemId",
+                table: "sub_nav_items",
+                column: "NavItemId");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_users_roles_RoleId",
+                table: "users",
+                column: "RoleId",
+                principalTable: "roles",
+                principalColumn: "RoleId",
+                onDelete: ReferentialAction.Restrict);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_users_roles_RoleId",
+                table: "users");
+
+            migrationBuilder.DropTable(
+                name: "role_permissions");
+
+            migrationBuilder.DropTable(
+                name: "permissions");
+
+            migrationBuilder.DropTable(
+                name: "roles");
+
+            migrationBuilder.DropTable(
+                name: "sub_nav_items");
+
+            migrationBuilder.DropTable(
+                name: "nav_items");
+
+            migrationBuilder.DropIndex(
+                name: "IX_users_RoleId",
+                table: "users");
+
+            migrationBuilder.DropColumn(
+                name: "RoleId",
+                table: "users");
+        }
+    }
+}

Backend/ERPCore/Infra/Persistence/Migrations/ErpDbContextModelSnapshot.cs

@@ -277,6 +277,10 @@ namespace ERPCore.Infra.Persistence.Migrations
                     b.Property<int?>("BinId")
                         .HasColumnType("integer");
 
+                    b.Property<decimal>("DiscountPct")
+                        .HasPrecision(9, 4)
+                        .HasColumnType("numeric(9,4)");
+
                     b.Property<int>("GrnId")
                         .HasColumnType("integer");
 
@@ -288,9 +292,21 @@ namespace ERPCore.Infra.Persistence.Migrations
                     b.Property<int>("ItemId")
                         .HasColumnType("integer");
 
+                    b.Property<decimal>("LineTotal")
+                        .HasPrecision(18, 4)
+                        .HasColumnType("numeric(18,4)");
+
+                    b.Property<decimal>("NetUnitCost")
+                        .HasPrecision(18, 6)
+                        .HasColumnType("numeric(18,6)");
+
                     b.Property<int?>("PoLineId")
                         .HasColumnType("integer");
 
+                    b.Property<decimal?>("PoUnitPrice")
+                        .HasPrecision(18, 6)
+                        .HasColumnType("numeric(18,6)");
+
                     b.Property<decimal>("Qty")
                         .HasPrecision(18, 4)
                         .HasColumnType("numeric(18,4)");
@@ -306,6 +322,14 @@ namespace ERPCore.Infra.Persistence.Migrations
                     b.Property<int>("UomId")
                         .HasColumnType("integer");
 
+                    b.Property<decimal>("VatAmount")
+                        .HasPrecision(18, 4)
+                        .HasColumnType("numeric(18,4)");
+
+                    b.Property<decimal>("VatPct")
+                        .HasPrecision(9, 4)
+                        .HasColumnType("numeric(9,4)");
+
                     b.HasKey("GrnLineId");
 
                     b.HasIndex("BatchId");
@@ -361,6 +385,10 @@ namespace ERPCore.Infra.Persistence.Migrations
                         .HasColumnType("xid")
                         .HasColumnName("xmin");
 
+                    b.Property<decimal?>("SalePrice")
+                        .HasPrecision(18, 4)
+                        .HasColumnType("numeric(18,4)");
+
                     b.Property<string>("Sku")
                         .IsRequired()
                         .HasMaxLength(50)
@@ -524,6 +552,142 @@ namespace ERPCore.Infra.Persistence.Migrations
                     b.ToTable("journal_entry_stubs", (string)null);
                 });
 
+            modelBuilder.Entity("ERPCore.Domain.Entities.NavItem", b =>
+                {
+                    b.Property<int>("NavItemId")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("NavItemId"));
+
+                    b.Property<string>("Code")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)");
+
+                    b.Property<string>("Href")
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)");
+
+                    b.Property<string>("Icon")
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)");
+
+                    b.Property<string>("Label")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)");
+
+                    b.Property<int>("SortOrder")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Status")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasMaxLength(20)
+                        .HasColumnType("character varying(20)")
+                        .HasDefaultValue("Active");
+
+                    b.HasKey("NavItemId");
+
+                    b.HasIndex("Code")
+                        .IsUnique();
+
+                    b.ToTable("nav_items", (string)null);
+
+                    b.HasData(
+                        new
+                        {
+                            NavItemId = 1,
+                            Code = "dashboard",
+                            Href = "/dashboard",
+                            Label = "Dashboard",
+                            SortOrder = 1,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            NavItemId = 2,
+                            Code = "products",
+                            Href = "/dashboard/products",
+                            Label = "Products",
+                            SortOrder = 2,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            NavItemId = 3,
+                            Code = "vendors",
+                            Href = "/dashboard/vendors",
+                            Label = "Vendors",
+                            SortOrder = 3,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            NavItemId = 4,
+                            Code = "procurement",
+                            Href = "/dashboard/procurement",
+                            Label = "Procurement",
+                            SortOrder = 4,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            NavItemId = 5,
+                            Code = "receiving",
+                            Href = "/dashboard/receiving/grn",
+                            Label = "Receiving",
+                            SortOrder = 5,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            NavItemId = 6,
+                            Code = "stock",
+                            Href = "/dashboard/stock",
+                            Label = "Stock",
+                            SortOrder = 6,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            NavItemId = 7,
+                            Code = "warehouses",
+                            Href = "/dashboard/warehouse",
+                            Label = "Warehouses",
+                            SortOrder = 7,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            NavItemId = 8,
+                            Code = "orders",
+                            Href = "/dashboard/orders",
+                            Label = "Orders",
+                            SortOrder = 8,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            NavItemId = 9,
+                            Code = "settings",
+                            Href = "/dashboard/settings",
+                            Label = "Settings",
+                            SortOrder = 9,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            NavItemId = 10,
+                            Code = "help",
+                            Href = "/dashboard/help",
+                            Label = "Help",
+                            SortOrder = 10,
+                            Status = "Active"
+                        });
+                });
+
             modelBuilder.Entity("ERPCore.Domain.Entities.NumberSequence", b =>
                 {
                     b.Property<int>("SequenceId")
@@ -554,6 +718,171 @@ namespace ERPCore.Infra.Persistence.Migrations
                     b.ToTable("number_sequences", (string)null);
                 });
 
+            modelBuilder.Entity("ERPCore.Domain.Entities.Permission", b =>
+                {
+                    b.Property<int>("PermissionId")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("PermissionId"));
+
+                    b.Property<string>("Code")
+                        .IsRequired()
+                        .HasMaxLength(80)
+                        .HasColumnType("character varying(80)");
+
+                    b.Property<int?>("NavItemId")
+                        .HasColumnType("integer");
+
+                    b.Property<int?>("SubNavItemId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("PermissionId");
+
+                    b.HasIndex("Code")
+                        .IsUnique();
+
+                    b.HasIndex("NavItemId");
+
+                    b.HasIndex("SubNavItemId");
+
+                    b.ToTable("permissions", (string)null);
+
+                    b.HasData(
+                        new
+                        {
+                            PermissionId = 1,
+                            Code = "NAV:dashboard",
+                            NavItemId = 1
+                        },
+                        new
+                        {
+                            PermissionId = 2,
+                            Code = "NAV:products",
+                            NavItemId = 2
+                        },
+                        new
+                        {
+                            PermissionId = 3,
+                            Code = "NAV:vendors",
+                            NavItemId = 3
+                        },
+                        new
+                        {
+                            PermissionId = 4,
+                            Code = "NAV:procurement",
+                            NavItemId = 4
+                        },
+                        new
+                        {
+                            PermissionId = 5,
+                            Code = "NAV:receiving",
+                            NavItemId = 5
+                        },
+                        new
+                        {
+                            PermissionId = 6,
+                            Code = "NAV:stock",
+                            NavItemId = 6
+                        },
+                        new
+                        {
+                            PermissionId = 7,
+                            Code = "NAV:warehouses",
+                            NavItemId = 7
+                        },
+                        new
+                        {
+                            PermissionId = 8,
+                            Code = "NAV:orders",
+                            NavItemId = 8
+                        },
+                        new
+                        {
+                            PermissionId = 9,
+                            Code = "NAV:settings",
+                            NavItemId = 9
+                        },
+                        new
+                        {
+                            PermissionId = 10,
+                            Code = "NAV:help",
+                            NavItemId = 10
+                        },
+                        new
+                        {
+                            PermissionId = 11,
+                            Code = "NAV:products.item",
+                            SubNavItemId = 1
+                        },
+                        new
+                        {
+                            PermissionId = 12,
+                            Code = "NAV:products.category",
+                            SubNavItemId = 2
+                        },
+                        new
+                        {
+                            PermissionId = 13,
+                            Code = "NAV:products.brand",
+                            SubNavItemId = 3
+                        },
+                        new
+                        {
+                            PermissionId = 14,
+                            Code = "NAV:products.item-type",
+                            SubNavItemId = 4
+                        },
+                        new
+                        {
+                            PermissionId = 15,
+                            Code = "NAV:products.uom",
+                            SubNavItemId = 5
+                        },
+                        new
+                        {
+                            PermissionId = 16,
+                            Code = "NAV:products.configuration",
+                            SubNavItemId = 6
+                        },
+                        new
+                        {
+                            PermissionId = 17,
+                            Code = "NAV:settings.roles",
+                            SubNavItemId = 7
+                        },
+                        new
+                        {
+                            PermissionId = 18,
+                            Code = "NAV:settings.users",
+                            SubNavItemId = 8
+                        },
+                        new
+                        {
+                            PermissionId = 19,
+                            Code = "NAV:procurement.requisitions",
+                            SubNavItemId = 9
+                        },
+                        new
+                        {
+                            PermissionId = 20,
+                            Code = "NAV:procurement.rfqs",
+                            SubNavItemId = 10
+                        },
+                        new
+                        {
+                            PermissionId = 21,
+                            Code = "NAV:procurement.purchase-orders",
+                            SubNavItemId = 11
+                        },
+                        new
+                        {
+                            PermissionId = 22,
+                            Code = "NAV:procurement.purchase-returns",
+                            SubNavItemId = 12
+                        });
+                });
+
             modelBuilder.Entity("ERPCore.Domain.Entities.PoLine", b =>
                 {
                     b.Property<int>("PoLineId")
@@ -942,6 +1271,78 @@ namespace ERPCore.Infra.Persistence.Migrations
                     b.ToTable("rfq_lines", (string)null);
                 });
 
+            modelBuilder.Entity("ERPCore.Domain.Entities.Role", b =>
+                {
+                    b.Property<int>("RoleId")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("RoleId"));
+
+                    b.Property<Guid>("AuthRoleId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("auth_role_id");
+
+                    b.Property<string>("Code")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<bool>("IsSystemRole")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(false);
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)");
+
+                    b.Property<uint>("RowVersion")
+                        .IsConcurrencyToken()
+                        .ValueGeneratedOnAddOrUpdate()
+                        .HasColumnType("xid")
+                        .HasColumnName("xmin");
+
+                    b.Property<string>("Status")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasMaxLength(20)
+                        .HasColumnType("character varying(20)")
+                        .HasDefaultValue("Active");
+
+                    b.Property<DateTime?>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.HasKey("RoleId");
+
+                    b.HasIndex("AuthRoleId")
+                        .IsUnique();
+
+                    b.HasIndex("Code")
+                        .IsUnique();
+
+                    b.ToTable("roles", (string)null);
+                });
+
+            modelBuilder.Entity("ERPCore.Domain.Entities.RolePermission", b =>
+                {
+                    b.Property<int>("RoleId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("PermissionId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("RoleId", "PermissionId");
+
+                    b.HasIndex("PermissionId");
+
+                    b.ToTable("role_permissions", (string)null);
+                });
+
             modelBuilder.Entity("ERPCore.Domain.Entities.Serial", b =>
                 {
                     b.Property<int>("SerialId")
@@ -1439,6 +1840,177 @@ namespace ERPCore.Infra.Persistence.Migrations
                     b.ToTable("subcategories", (string)null);
                 });
 
+            modelBuilder.Entity("ERPCore.Domain.Entities.SubNavItem", b =>
+                {
+                    b.Property<int>("SubNavItemId")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("SubNavItemId"));
+
+                    b.Property<string>("Code")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)");
+
+                    b.Property<string>("Href")
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)");
+
+                    b.Property<string>("Icon")
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)");
+
+                    b.Property<string>("Label")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)");
+
+                    b.Property<int>("NavItemId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SortOrder")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Status")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasMaxLength(20)
+                        .HasColumnType("character varying(20)")
+                        .HasDefaultValue("Active");
+
+                    b.HasKey("SubNavItemId");
+
+                    b.HasIndex("Code")
+                        .IsUnique();
+
+                    b.HasIndex("NavItemId");
+
+                    b.ToTable("sub_nav_items", (string)null);
+
+                    b.HasData(
+                        new
+                        {
+                            SubNavItemId = 1,
+                            Code = "products.item",
+                            Href = "/dashboard/products",
+                            Label = "Item",
+                            NavItemId = 2,
+                            SortOrder = 1,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            SubNavItemId = 2,
+                            Code = "products.category",
+                            Href = "/dashboard/products/categories",
+                            Label = "Category",
+                            NavItemId = 2,
+                            SortOrder = 2,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            SubNavItemId = 3,
+                            Code = "products.brand",
+                            Href = "/dashboard/products/brands",
+                            Label = "Brand",
+                            NavItemId = 2,
+                            SortOrder = 3,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            SubNavItemId = 4,
+                            Code = "products.item-type",
+                            Href = "/dashboard/products/item-types",
+                            Label = "Item Type",
+                            NavItemId = 2,
+                            SortOrder = 4,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            SubNavItemId = 5,
+                            Code = "products.uom",
+                            Href = "/dashboard/products/uoms",
+                            Label = "UOM",
+                            NavItemId = 2,
+                            SortOrder = 5,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            SubNavItemId = 6,
+                            Code = "products.configuration",
+                            Href = "/dashboard/products/settings",
+                            Label = "Configuration",
+                            NavItemId = 2,
+                            SortOrder = 6,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            SubNavItemId = 7,
+                            Code = "settings.roles",
+                            Href = "/dashboard/settings/roles",
+                            Label = "Roles",
+                            NavItemId = 9,
+                            SortOrder = 1,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            SubNavItemId = 8,
+                            Code = "settings.users",
+                            Href = "/dashboard/settings/users",
+                            Label = "Users",
+                            NavItemId = 9,
+                            SortOrder = 2,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            SubNavItemId = 9,
+                            Code = "procurement.requisitions",
+                            Href = "/dashboard/procurement/requisitions",
+                            Label = "Requisitions",
+                            NavItemId = 4,
+                            SortOrder = 1,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            SubNavItemId = 10,
+                            Code = "procurement.rfqs",
+                            Href = "/dashboard/procurement/rfqs",
+                            Label = "RFQs",
+                            NavItemId = 4,
+                            SortOrder = 2,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            SubNavItemId = 11,
+                            Code = "procurement.purchase-orders",
+                            Href = "/dashboard/procurement/purchase-orders",
+                            Label = "Purchase Orders",
+                            NavItemId = 4,
+                            SortOrder = 3,
+                            Status = "Active"
+                        },
+                        new
+                        {
+                            SubNavItemId = 12,
+                            Code = "procurement.purchase-returns",
+                            Href = "/dashboard/procurement/purchase-returns",
+                            Label = "Purchase Returns",
+                            NavItemId = 4,
+                            SortOrder = 4,
+                            Status = "Active"
+                        });
+                });
+
             modelBuilder.Entity("ERPCore.Domain.Entities.Uom", b =>
                 {
                     b.Property<int>("UomId")
@@ -1510,6 +2082,9 @@ namespace ERPCore.Infra.Persistence.Migrations
                         .HasMaxLength(200)
                         .HasColumnType("character varying(200)");
 
+                    b.Property<int?>("RoleId")
+                        .HasColumnType("integer");
+
                     b.Property<string>("Status")
                         .IsRequired()
                         .HasMaxLength(20)
@@ -1525,6 +2100,8 @@ namespace ERPCore.Infra.Persistence.Migrations
                     b.HasIndex("AuthUserId")
                         .IsUnique();
 
+                    b.HasIndex("RoleId");
+
                     b.HasIndex("Username")
                         .IsUnique();
 
@@ -1857,6 +2434,23 @@ namespace ERPCore.Infra.Persistence.Migrations
                     b.Navigation("Warehouse");
                 });
 
+            modelBuilder.Entity("ERPCore.Domain.Entities.Permission", b =>
+                {
+                    b.HasOne("ERPCore.Domain.Entities.NavItem", "NavItem")
+                        .WithMany()
+                        .HasForeignKey("NavItemId")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.HasOne("ERPCore.Domain.Entities.SubNavItem", "SubNavItem")
+                        .WithMany()
+                        .HasForeignKey("SubNavItemId")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.Navigation("NavItem");
+
+                    b.Navigation("SubNavItem");
+                });
+
             modelBuilder.Entity("ERPCore.Domain.Entities.PoLine", b =>
                 {
                     b.HasOne("ERPCore.Domain.Entities.Item", "Item")
@@ -2049,6 +2643,25 @@ namespace ERPCore.Infra.Persistence.Migrations
                     b.Navigation("Rfq");
                 });
 
+            modelBuilder.Entity("ERPCore.Domain.Entities.RolePermission", b =>
+                {
+                    b.HasOne("ERPCore.Domain.Entities.Permission", "Permission")
+                        .WithMany()
+                        .HasForeignKey("PermissionId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("ERPCore.Domain.Entities.Role", "Role")
+                        .WithMany()
+                        .HasForeignKey("RoleId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Permission");
+
+                    b.Navigation("Role");
+                });
+
             modelBuilder.Entity("ERPCore.Domain.Entities.Serial", b =>
                 {
                     b.HasOne("ERPCore.Domain.Entities.Item", "Item")
@@ -2317,6 +2930,17 @@ namespace ERPCore.Infra.Persistence.Migrations
                     b.Navigation("Category");
                 });
 
+            modelBuilder.Entity("ERPCore.Domain.Entities.SubNavItem", b =>
+                {
+                    b.HasOne("ERPCore.Domain.Entities.NavItem", "NavItem")
+                        .WithMany("Children")
+                        .HasForeignKey("NavItemId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("NavItem");
+                });
+
             modelBuilder.Entity("ERPCore.Domain.Entities.UomConversion", b =>
                 {
                     b.HasOne("ERPCore.Domain.Entities.Uom", "FromUom")
@@ -2344,6 +2968,16 @@ namespace ERPCore.Infra.Persistence.Migrations
                     b.Navigation("ToUom");
                 });
 
+            modelBuilder.Entity("ERPCore.Domain.Entities.User", b =>
+                {
+                    b.HasOne("ERPCore.Domain.Entities.Role", "Role")
+                        .WithMany()
+                        .HasForeignKey("RoleId")
+                        .OnDelete(DeleteBehavior.Restrict);
+
+                    b.Navigation("Role");
+                });
+
             modelBuilder.Entity("ERPCore.Domain.Entities.VendorQuotation", b =>
                 {
                     b.HasOne("ERPCore.Domain.Entities.Rfq", "Rfq")
@@ -2399,6 +3033,11 @@ namespace ERPCore.Infra.Persistence.Migrations
                     b.Navigation("UomConversions");
                 });
 
+            modelBuilder.Entity("ERPCore.Domain.Entities.NavItem", b =>
+                {
+                    b.Navigation("Children");
+                });
+
             modelBuilder.Entity("ERPCore.Domain.Entities.PurchaseOrder", b =>
                 {
                     b.Navigation("Lines");

Backend/ERPCore/Program.cs

@@ -68,6 +68,10 @@ builder.Services.AddScoped<IProductConfigService, ProductConfigService>();
 builder.Services.AddScoped<IVendorService, VendorService>();
 builder.Services.AddScoped<IWarehouseService, WarehouseService>();
 
+// RBAC / sidebar: Role (shadow of AuthHex) + Permission assignment + user management
+builder.Services.AddScoped<IRoleService, RoleService>();
+builder.Services.AddScoped<IUserManagementService, UserManagementService>();
+
 // Cross-cutting + procurement services (docs/11 §3)
 builder.Services.AddScoped<INumberSequenceService, NumberSequenceService>();
 builder.Services.AddScoped<IRequisitionService, RequisitionService>();

Backend/ERPCore/Services/GrnService.cs

@@ -138,8 +138,11 @@ public sealed class GrnService : IGrnService
             if (input.BinId is not null && !await _bins.Query().AnyAsync(b => b.BinId == input.BinId && b.WarehouseId == request.WarehouseId, ct))
                 throw new DomainException(ErrorCodes.Validation, $"Bin {input.BinId} is not in warehouse {request.WarehouseId}.", 422);
 
-            // Cost: PO-derived for PO lines (client cost ignored, C.3); entered for direct.
+            // Cost: for a PO line, the PO price is used unless an override is entered (then it
+            // wins and a variance is recorded against the PO snapshot — docs/02-SECURITY C.3,
+            // revised). Direct receipts always use the entered cost.
             decimal unitCost;
+            decimal? poUnitPrice = null;
             if (input.PoLineId is not null)
             {
                 var poLine = po?.Lines.FirstOrDefault(l => l.PoLineId == input.PoLineId)
@@ -152,13 +155,19 @@ public sealed class GrnService : IGrnService
                     throw new DomainException(ErrorCodes.OverReceiptTolerance,
                         $"Receiving {input.Qty} exceeds the open quantity {openQty} on PO line {input.PoLineId}.", 422);
 
-                unitCost = poLine.UnitPrice;
+                poUnitPrice = poLine.UnitPrice;
+                unitCost = input.UnitCost > 0 ? input.UnitCost : poLine.UnitPrice;
             }
             else
             {
                 unitCost = input.UnitCost;
             }
 
+            // Derived figures are always computed server-side, never accepted from the client.
+            var netUnitCost = Math.Round(unitCost * (1 - input.DiscountPct / 100m), 6, MidpointRounding.AwayFromZero);
+            var receivedValue = Math.Round(input.Qty * netUnitCost, 4, MidpointRounding.AwayFromZero);
+            var vatAmount = Math.Round(receivedValue * input.VatPct / 100m, 4, MidpointRounding.AwayFromZero);
+
             var batch = await ResolveBatchAsync(item, input.Batch, batchCache, ct);
 
             lines.Add(new GrnLine
@@ -170,7 +179,13 @@ public sealed class GrnService : IGrnService
                 Batch = batch, // navigation so EF fixes up BatchId once the batch is inserted
                 Qty = input.Qty,
                 UnitCost = unitCost,
-                ReceivedValue = Math.Round(input.Qty * unitCost, 4, MidpointRounding.AwayFromZero),
+                PoUnitPrice = poUnitPrice,
+                DiscountPct = input.DiscountPct,
+                NetUnitCost = netUnitCost,
+                VatPct = input.VatPct,
+                VatAmount = vatAmount,
+                ReceivedValue = receivedValue,
+                LineTotal = receivedValue + vatAmount,
                 HoldStatus = input.HoldStatus
             });
         }
@@ -220,7 +235,9 @@ public sealed class GrnService : IGrnService
             foreach (var line in grn.Lines.OrderBy(l => l.GrnLineId))
             {
                 var item = await _items.Query().AsNoTracking().FirstAsync(i => i.ItemId == line.ItemId, token);
-                var (qtyBase, unitCostBase) = await ToBaseAsync(item, line.UomId, line.Qty, line.UnitCost, token);
+                // FIFO layer costs at the after-discount net price; VAT is recoverable and never
+                // enters stock value (docs/10 FR-GRN-06, revised).
+                var (qtyBase, unitCostBase) = await ToBaseAsync(item, line.UomId, line.Qty, line.NetUnitCost, token);
 
                 var layer = await _fifo.CreateInboundLayerAsync(
                     line.ItemId, grn.WarehouseId, line.BatchId, null, line.GrnLineId,
@@ -380,5 +397,8 @@ public sealed class GrnService : IGrnService
     private static GrnDto Map(Grn g) => new(
         g.GrnId, g.DocNo, g.PoId, g.VendorId, g.WarehouseId, g.Status, g.CreatedBy, g.CreatedAt, g.PostedAt,
         g.Lines.OrderBy(l => l.GrnLineId).Select(l => new GrnLineDto(
-            l.GrnLineId, l.PoLineId, l.ItemId, l.UomId, l.BinId, l.Qty, l.UnitCost, l.ReceivedValue, l.HoldStatus, l.BatchId)).ToList());
+            l.GrnLineId, l.PoLineId, l.ItemId, l.UomId, l.BinId, l.Qty, l.UnitCost, l.PoUnitPrice,
+            l.DiscountPct, l.NetUnitCost, l.VatPct, l.VatAmount, l.ReceivedValue, l.LineTotal,
+            l.PoUnitPrice is null ? 0m : Math.Round((l.UnitCost - l.PoUnitPrice.Value) * l.Qty, 4, MidpointRounding.AwayFromZero),
+            l.HoldStatus, l.BatchId)).ToList());
 }

Backend/ERPCore/Services/Interfaces/IPurchaseOrderService.cs

@@ -16,4 +16,10 @@ public interface IPurchaseOrderService
     Task<ETagged<PurchaseOrderDto>> UpdateAsync(int poId, UpdatePurchaseOrderRequest request, uint expectedRowVersion, CancellationToken ct = default);
     Task<PurchaseOrderDto> ApproveAsync(int poId, CancellationToken ct = default);
     Task<PurchaseOrderDto> CancelAsync(int poId, string? reason, CancellationToken ct = default);
+
+    /// <summary>Submit a Draft PO (Draft → Approved). 409 PO_NOT_EDITABLE if not Draft.</summary>
+    Task<PurchaseOrderDto> SubmitAsync(int poId, CancellationToken ct = default);
+
+    /// <summary>Delete a PO — permitted only while Draft, else 409 PO_NOT_EDITABLE.</summary>
+    Task DeleteAsync(int poId, CancellationToken ct = default);
 }

Backend/ERPCore/Services/Interfaces/IRoleService.cs

@@ -0,0 +1,28 @@
+using ERPCore.Common.Http;
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Rbac;
+
+namespace ERPCore.Services.Interfaces;
+
+/// <summary>
+/// Role CRUD + permission assignment. AuthHex is the source of truth for Role
+/// identity (docs/10 C.9 "shadow user" pattern, applied to Role): every write is
+/// forwarded to AuthHex first, then mirrored into the local shadow <c>Role</c> row.
+/// Permission assignment is purely local (ERPCore/UI concern, not an AuthHex one).
+/// </summary>
+public interface IRoleService
+{
+    Task<PagedResponse<RoleDto>> ListAsync(PageQuery query, EntityStatus? status, CancellationToken ct = default);
+    Task<ETagged<RoleDto>?> GetAsync(int roleId, CancellationToken ct = default);
+    Task<ETagged<RoleDto>> CreateAsync(CreateRoleRequest request, CancellationToken ct = default);
+    Task<ETagged<RoleDto>> UpdateAsync(int roleId, UpdateRoleRequest request, uint expectedRowVersion, CancellationToken ct = default);
+    Task SetStatusAsync(int roleId, EntityStatus status, CancellationToken ct = default);
+    Task DeleteAsync(int roleId, CancellationToken ct = default);
+
+    Task<RolePermissionsDto> GetPermissionsAsync(int roleId, CancellationToken ct = default);
+    Task<RolePermissionsDto> AssignPermissionsAsync(int roleId, AssignRolePermissionsRequest request, CancellationToken ct = default);
+
+    /// <summary>Resolves the nav codes a role (by AuthHex `RoleCode` claim) may see. Used by `GET /auth/me`.</summary>
+    Task<MeResponseDto> GetMeAsync(string? roleCode, CancellationToken ct = default);
+}

Backend/ERPCore/Services/Interfaces/IUserManagementService.cs

@@ -0,0 +1,20 @@
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Users;
+
+namespace ERPCore.Services.Interfaces;
+
+/// <summary>
+/// Admin-facing user management: list/create/reassign-role against the local
+/// shadow `User` table, orchestrating account creation in AuthHex too (see
+/// <see cref="CreateUserRequest"/>).
+/// </summary>
+public interface IUserManagementService
+{
+    Task<PagedResponse<ManagedUserDto>> ListAsync(PageQuery query, CancellationToken ct = default);
+    Task<ManagedUserDto?> GetAsync(int userId, CancellationToken ct = default);
+    Task<ManagedUserDto> CreateAsync(CreateUserRequest request, CancellationToken ct = default);
+    Task<ManagedUserDto> UpdateRoleAsync(int userId, UpdateUserRoleRequest request, CancellationToken ct = default);
+
+    /// <summary>AuthHex UserType options for the create-user form's select.</summary>
+    Task<List<UserTypeOptionDto>> ListUserTypesAsync(CancellationToken ct = default);
+}

Backend/ERPCore/Services/ItemService.cs

@@ -79,7 +79,7 @@ public sealed class ItemService : IItemService
             .Select(i => new ItemListItemDto(
                 i.ItemId, i.Sku, i.Name, i.CategoryId, i.SubCategoryId, i.BrandId,
                 i.BaseUomId, i.DefaultVendorId,
-                i.StockNature, i.TrackingMode, i.TaxClass, i.Status))
+                i.StockNature, i.TrackingMode, i.TaxClass, i.SalePrice, i.Status))
             .ToListAsync(ct);
 
         return PagedResponse<ItemListItemDto>.Create(rows, query.Page, query.PageSize, total);
@@ -117,6 +117,7 @@ public sealed class ItemService : IItemService
             StockNature = request.StockNature,
             TrackingMode = request.TrackingMode,
             TaxClass = request.TaxClass,
+            SalePrice = request.SalePrice,
             Status = EntityStatus.Active,
             CreatedAt = DateTime.UtcNow
         };
@@ -158,6 +159,7 @@ public sealed class ItemService : IItemService
         item.StockNature = request.StockNature;
         item.TrackingMode = request.TrackingMode;
         item.TaxClass = request.TaxClass;
+        item.SalePrice = request.SalePrice;
         item.UpdatedAt = DateTime.UtcNow;
 
         await SaveGuardingConcurrencyAsync(ct);
@@ -348,7 +350,7 @@ public sealed class ItemService : IItemService
     private static ItemDetailDto ToDetail(Item i) => new(
         i.ItemId, i.Sku, i.Name, i.Description, i.CategoryId, i.SubCategoryId, i.BrandId,
         i.BaseUomId, i.DefaultVendorId,
-        i.StockNature, i.TrackingMode, i.TaxClass, i.Status,
+        i.StockNature, i.TrackingMode, i.TaxClass, i.SalePrice, i.Status,
         i.ReorderSettings
             .OrderBy(r => r.WarehouseId)
             .Select(r => new ItemReorderDto(r.WarehouseId, r.ReorderPoint, r.ReorderQty))

Backend/ERPCore/Services/PurchaseOrderService.cs

@@ -92,9 +92,10 @@ public sealed class PurchaseOrderService : IPurchaseOrderService
                 DocNo = docNo,
                 VendorId = request.VendorId,
                 RequisitionId = request.RequisitionId,
-                // Phase 1: approvalRequired defaults off → auto-approved on creation (FR-PROC-04).
+                // Phase 1: approvalRequired defaults off → auto-approved on creation (FR-PROC-04),
+                // unless the caller explicitly saves a Draft (editable/deletable until submitted).
                 ApprovalRequired = false,
-                Status = PurchaseOrderStatus.Approved,
+                Status = request.SaveAsDraft ? PurchaseOrderStatus.Draft : PurchaseOrderStatus.Approved,
                 CreatedBy = actor,
                 CreatedAt = DateTime.UtcNow,
                 Lines = request.Lines.Select(ToLine).ToList()
@@ -182,8 +183,41 @@ public sealed class PurchaseOrderService : IPurchaseOrderService
         return Map(po);
     }
 
-    private static bool IsEditable(PurchaseOrderStatus status) => status is not (
-        PurchaseOrderStatus.FullyReceived or PurchaseOrderStatus.Closed or PurchaseOrderStatus.Cancelled);
+    public async Task<PurchaseOrderDto> SubmitAsync(int poId, CancellationToken ct = default)
+    {
+        var po = await _pos.Query()
+            .Include(p => p.Lines)
+            .FirstOrDefaultAsync(p => p.PoId == poId, ct)
+            ?? throw new NotFoundException($"Purchase order {poId} was not found.");
+
+        if (po.Status != PurchaseOrderStatus.Draft)
+            throw new DomainException(ErrorCodes.PoNotEditable, $"Purchase order {poId} is {po.Status} and cannot be submitted.", 409);
+
+        // Phase 1: no value gate, so a submitted draft goes straight to Approved (FR-PROC-04).
+        po.Status = PurchaseOrderStatus.Approved;
+        po.UpdatedAt = DateTime.UtcNow;
+        await _uow.SaveChangesAsync(ct);
+
+        return Map(po);
+    }
+
+    public async Task DeleteAsync(int poId, CancellationToken ct = default)
+    {
+        var po = await _pos.Query()
+            .Include(p => p.Lines)
+            .FirstOrDefaultAsync(p => p.PoId == poId, ct)
+            ?? throw new NotFoundException($"Purchase order {poId} was not found.");
+
+        if (po.Status != PurchaseOrderStatus.Draft)
+            throw new DomainException(ErrorCodes.PoNotEditable, $"Purchase order {poId} is {po.Status} and cannot be deleted; only a Draft can be deleted.", 409);
+
+        _pos.Remove(po);
+        await _uow.SaveChangesAsync(ct);
+    }
+
+    // FR-PROC-05 (revised): a PO is editable/deletable only while Draft. Submitting locks it.
+    // Supersedes Phase-1 Option B "freely editable while open" — see docs/10 FR-PROC-05.
+    private static bool IsEditable(PurchaseOrderStatus status) => status is PurchaseOrderStatus.Draft;
 
     private static PoLine ToLine(CreatePoLineInput l) => new()
     {

Backend/ERPCore/Services/RoleService.cs

@@ -0,0 +1,218 @@
+using ERPCore.Common.Http;
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Auth;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Rbac;
+using ERPCore.Infra.Auth.AuthHex;
+using ERPCore.Infra.UoW;
+using ERPCore.Repositories.Interfaces;
+using ERPCore.Services.Interfaces;
+using ERPCore.System.Errors;
+using Microsoft.EntityFrameworkCore;
+
+namespace ERPCore.Services;
+
+public sealed class RoleService : IRoleService
+{
+    private readonly IRepository<Role> _roles;
+    private readonly IRepository<RolePermission> _rolePermissions;
+    private readonly IRepository<Permission> _permissions;
+    private readonly IAuthHexClient _authHex;
+    private readonly IUnitOfWork _uow;
+
+    public RoleService(
+        IRepository<Role> roles, IRepository<RolePermission> rolePermissions, IRepository<Permission> permissions,
+        IAuthHexClient authHex, IUnitOfWork uow)
+    {
+        _roles = roles;
+        _rolePermissions = rolePermissions;
+        _permissions = permissions;
+        _authHex = authHex;
+        _uow = uow;
+    }
+
+    public async Task<PagedResponse<RoleDto>> ListAsync(PageQuery query, EntityStatus? status, CancellationToken ct = default)
+    {
+        var q = _roles.Query().AsNoTracking();
+        if (!string.IsNullOrWhiteSpace(query.Q))
+        {
+            var term = query.Q.Trim();
+            q = q.Where(r => EF.Functions.ILike(r.Code, $"%{term}%") || EF.Functions.ILike(r.Name, $"%{term}%"));
+        }
+        if (status is not null) q = q.Where(r => r.Status == status);
+
+        var total = await q.CountAsync(ct);
+        var rows = await q.OrderBy(r => r.Code)
+            .Skip(query.Skip).Take(query.PageSize)
+            .ToListAsync(ct);
+
+        return PagedResponse<RoleDto>.Create(rows.Select(Map).ToList(), query.Page, query.PageSize, total);
+    }
+
+    public async Task<ETagged<RoleDto>?> GetAsync(int roleId, CancellationToken ct = default)
+    {
+        var role = await _roles.Query().AsNoTracking().FirstOrDefaultAsync(r => r.RoleId == roleId, ct);
+        return role is null ? null : new ETagged<RoleDto>(Map(role), role.RowVersion);
+    }
+
+    public async Task<ETagged<RoleDto>> CreateAsync(CreateRoleRequest request, CancellationToken ct = default)
+    {
+        var code = request.Code.Trim();
+        if (await _roles.Query().AnyAsync(r => r.Code == code, ct))
+            throw new ConflictException($"A role with code '{code}' already exists.");
+
+        var authRole = await _authHex.CreateRoleAsync(
+            new CreateAuthHexRoleRequest { Code = code, Name = request.Name.Trim() }, ct);
+
+        var role = new Role
+        {
+            AuthRoleId = authRole.RoleId,
+            Code = code,
+            Name = request.Name.Trim(),
+            IsSystemRole = authRole.IsSystemRole ?? false,
+            Status = EntityStatus.Active,
+            CreatedAt = DateTime.UtcNow
+        };
+
+        await _roles.AddAsync(role, ct);
+        await _uow.SaveChangesAsync(ct);
+
+        return new ETagged<RoleDto>(Map(role), role.RowVersion);
+    }
+
+    public async Task<ETagged<RoleDto>> UpdateAsync(
+        int roleId, UpdateRoleRequest request, uint expectedRowVersion, CancellationToken ct = default)
+    {
+        var role = await _roles.GetByIdAsync(roleId, ct)
+            ?? throw new NotFoundException($"Role {roleId} was not found.");
+
+        if (role.RowVersion != expectedRowVersion)
+            throw new DomainException(ErrorCodes.ConcurrencyConflict, "The role was modified by another request.", 412);
+
+        var code = request.Code.Trim();
+        if (!string.Equals(role.Code, code, StringComparison.Ordinal)
+            && await _roles.Query().AnyAsync(r => r.Code == code && r.RoleId != roleId, ct))
+            throw new ConflictException($"A role with code '{code}' already exists.");
+
+        await _authHex.UpdateRoleAsync(
+            new UpdateAuthHexRoleRequest { RoleId = role.AuthRoleId, Code = code, Name = request.Name.Trim() }, ct);
+
+        role.Code = code;
+        role.Name = request.Name.Trim();
+        role.UpdatedAt = DateTime.UtcNow;
+
+        try
+        {
+            await _uow.SaveChangesAsync(ct);
+        }
+        catch (DbUpdateConcurrencyException)
+        {
+            throw new DomainException(ErrorCodes.ConcurrencyConflict, "The role was modified by another request.", 412);
+        }
+
+        return new ETagged<RoleDto>(Map(role), role.RowVersion);
+    }
+
+    public async Task SetStatusAsync(int roleId, EntityStatus status, CancellationToken ct = default)
+    {
+        var role = await _roles.GetByIdAsync(roleId, ct)
+            ?? throw new NotFoundException($"Role {roleId} was not found.");
+
+        role.Status = status;
+        role.UpdatedAt = DateTime.UtcNow;
+        await _uow.SaveChangesAsync(ct);
+    }
+
+    public async Task DeleteAsync(int roleId, CancellationToken ct = default)
+    {
+        var role = await _roles.GetByIdAsync(roleId, ct)
+            ?? throw new NotFoundException($"Role {roleId} was not found.");
+
+        try
+        {
+            await _authHex.DeleteRoleAsync(role.AuthRoleId, ct);
+        }
+        catch (DomainException ex) when (ex.Message.Contains("ROLE_IN_USE", StringComparison.OrdinalIgnoreCase))
+        {
+            throw new DomainException(ErrorCodes.RoleInUse, "This role is assigned to one or more users.", 409);
+        }
+
+        _roles.Remove(role);
+        await _uow.SaveChangesAsync(ct);
+    }
+
+    public async Task<RolePermissionsDto> GetPermissionsAsync(int roleId, CancellationToken ct = default)
+    {
+        _ = await _roles.GetByIdAsync(roleId, ct) ?? throw new NotFoundException($"Role {roleId} was not found.");
+
+        var granted = await _rolePermissions.Query().AsNoTracking()
+            .Where(rp => rp.RoleId == roleId)
+            .Include(rp => rp.Permission)
+            .Select(rp => rp.Permission!)
+            .ToListAsync(ct);
+
+        return new RolePermissionsDto(
+            roleId,
+            granted.Where(p => p.NavItemId is not null).Select(p => p.NavItemId!.Value).ToList(),
+            granted.Where(p => p.SubNavItemId is not null).Select(p => p.SubNavItemId!.Value).ToList());
+    }
+
+    public async Task<RolePermissionsDto> AssignPermissionsAsync(int roleId, AssignRolePermissionsRequest request, CancellationToken ct = default)
+    {
+        _ = await _roles.GetByIdAsync(roleId, ct) ?? throw new NotFoundException($"Role {roleId} was not found.");
+
+        var existing = await _rolePermissions.Query().Where(rp => rp.RoleId == roleId).ToListAsync(ct);
+        foreach (var rp in existing) _rolePermissions.Remove(rp);
+
+        var navIds = request.NavItemIds.Distinct().ToList();
+        var subNavIds = request.SubNavItemIds.Distinct().ToList();
+
+        var permissionIds = await _permissions.Query().AsNoTracking()
+            .Where(p => (p.NavItemId != null && navIds.Contains(p.NavItemId.Value))
+                     || (p.SubNavItemId != null && subNavIds.Contains(p.SubNavItemId.Value)))
+            .Select(p => p.PermissionId)
+            .ToListAsync(ct);
+
+        foreach (var permissionId in permissionIds)
+            await _rolePermissions.AddAsync(new RolePermission { RoleId = roleId, PermissionId = permissionId }, ct);
+
+        await _uow.SaveChangesAsync(ct);
+
+        return await GetPermissionsAsync(roleId, ct);
+    }
+
+    public async Task<MeResponseDto> GetMeAsync(string? roleCode, CancellationToken ct = default)
+    {
+        if (string.IsNullOrWhiteSpace(roleCode))
+            return new MeResponseDto(null, null, Array.Empty<string>());
+
+        // AuthHex mints the RoleCode claim independently of ERPCore's stored casing
+        // (e.g. token "ADMIN" vs seeded "Admin"), so match case-insensitively — an
+        // identity code differing only by case must not lock the user out of the nav.
+        var normalized = roleCode.Trim();
+        var role = await _roles.Query().AsNoTracking()
+            .FirstOrDefaultAsync(r => r.Code.ToLower() == normalized.ToLower(), ct);
+        if (role is null)
+            return new MeResponseDto(roleCode, null, Array.Empty<string>());
+
+        var permissions = await _rolePermissions.Query().AsNoTracking()
+            .Where(rp => rp.RoleId == role.RoleId)
+            .Include(rp => rp.Permission!).ThenInclude(p => p.NavItem)
+            .Include(rp => rp.Permission!).ThenInclude(p => p.SubNavItem)
+            .Select(rp => rp.Permission!)
+            .ToListAsync(ct);
+
+        var navCodes = permissions
+            .Select(p => p.NavItem?.Code ?? p.SubNavItem?.Code)
+            .Where(code => code is not null)
+            .Select(code => code!)
+            .Distinct()
+            .ToList();
+
+        return new MeResponseDto(role.Code, role.Name, navCodes);
+    }
+
+    private static RoleDto Map(Role r) => new(
+        r.RoleId, r.Code, r.Name, r.IsSystemRole, r.Status, r.CreatedAt, r.UpdatedAt);
+}

Backend/ERPCore/Services/UserManagementService.cs

@@ -0,0 +1,124 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Auth;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Users;
+using ERPCore.Infra.Auth.AuthHex;
+using ERPCore.Infra.UoW;
+using ERPCore.Repositories.Interfaces;
+using ERPCore.Services.Interfaces;
+using ERPCore.System.Errors;
+using Microsoft.EntityFrameworkCore;
+
+namespace ERPCore.Services;
+
+public sealed class UserManagementService : IUserManagementService
+{
+    private readonly IRepository<User> _users;
+    private readonly IRepository<Role> _roles;
+    private readonly IAuthUserService _authUsers;
+    private readonly IAuthHexClient _authHex;
+    private readonly IUnitOfWork _uow;
+
+    public UserManagementService(
+        IRepository<User> users, IRepository<Role> roles, IAuthUserService authUsers, IAuthHexClient authHex, IUnitOfWork uow)
+    {
+        _users = users;
+        _roles = roles;
+        _authUsers = authUsers;
+        _authHex = authHex;
+        _uow = uow;
+    }
+
+    public async Task<PagedResponse<ManagedUserDto>> ListAsync(PageQuery query, CancellationToken ct = default)
+    {
+        IQueryable<User> q = _users.Query().AsNoTracking().Include(u => u.Role);
+        if (!string.IsNullOrWhiteSpace(query.Q))
+        {
+            var term = query.Q.Trim();
+            q = q.Where(u => EF.Functions.ILike(u.Username, $"%{term}%") || EF.Functions.ILike(u.DisplayName, $"%{term}%"));
+        }
+
+        var total = await q.CountAsync(ct);
+        var rows = await q.OrderBy(u => u.Username)
+            .Skip(query.Skip).Take(query.PageSize)
+            .ToListAsync(ct);
+
+        return PagedResponse<ManagedUserDto>.Create(rows.Select(Map).ToList(), query.Page, query.PageSize, total);
+    }
+
+    public async Task<ManagedUserDto?> GetAsync(int userId, CancellationToken ct = default)
+    {
+        var user = await _users.Query().AsNoTracking().Include(u => u.Role)
+            .FirstOrDefaultAsync(u => u.UserId == userId, ct);
+        return user is null ? null : Map(user);
+    }
+
+    public async Task<ManagedUserDto> CreateAsync(CreateUserRequest request, CancellationToken ct = default)
+    {
+        var role = await _roles.GetByIdAsync(request.RoleId, ct)
+            ?? throw new NotFoundException($"Role {request.RoleId} was not found.");
+
+        var username = request.Username.Trim();
+        if (await _users.Query().AnyAsync(u => u.Username == username, ct))
+            throw new ConflictException($"A user with username '{username}' already exists.");
+
+        var authUserId = Guid.NewGuid();
+
+        // Source of truth: AuthHex creates the credential + emails it (registerUser,
+        // ERP_Auth_Service/Services/UserManager/UserManagerService.cs).
+        await _authUsers.RegisterAsync(new RegisterRequest
+        {
+            UserId = authUserId,
+            RoleId = role.AuthRoleId,
+            UserTypeId = request.UserTypeId,
+            Fullname = request.FullName.Trim(),
+            UserName = username,
+            Nic = request.Nic,
+            Email = request.Email.Trim(),
+            MobileNumber = request.MobileNumber,
+            Password = request.Password,
+            ChkUser = true
+        }, ct);
+
+        // Mirror into the local shadow User row immediately, rather than waiting
+        // for ShadowUserClaimsTransformation's next-login JIT provisioning.
+        var user = new User
+        {
+            AuthUserId = authUserId,
+            Username = username,
+            DisplayName = request.FullName.Trim(),
+            RoleId = role.RoleId,
+            Status = EntityStatus.Active
+        };
+
+        await _users.AddAsync(user, ct);
+        await _uow.SaveChangesAsync(ct);
+
+        user.Role = role;
+        return Map(user);
+    }
+
+    public async Task<ManagedUserDto> UpdateRoleAsync(int userId, UpdateUserRoleRequest request, CancellationToken ct = default)
+    {
+        var user = await _users.GetByIdAsync(userId, ct)
+            ?? throw new NotFoundException($"User {userId} was not found.");
+        var role = await _roles.GetByIdAsync(request.RoleId, ct)
+            ?? throw new NotFoundException($"Role {request.RoleId} was not found.");
+
+        user.RoleId = role.RoleId;
+        await _uow.SaveChangesAsync(ct);
+
+        user.Role = role;
+        return Map(user);
+    }
+
+    public async Task<List<UserTypeOptionDto>> ListUserTypesAsync(CancellationToken ct = default)
+    {
+        var userTypes = await _authHex.ListUserTypesAsync(ct);
+        return userTypes.Select(t => new UserTypeOptionDto(t.UserTypeId, t.Code, t.Description)).ToList();
+    }
+
+    private static ManagedUserDto Map(User u) => new(
+        u.UserId, u.Username, u.DisplayName, u.Status, u.RoleId, u.Role?.Code, u.Role?.Name);
+}

Backend/ERPCore/System/Errors/ErrorCodes.cs

@@ -25,6 +25,7 @@ public static class ErrorCodes
     public const string ConcurrencyConflict = "CONCURRENCY_CONFLICT";
     public const string IdempotencyReplay = "IDEMPOTENCY_REPLAY";
     public const string ConfigDisabled = "CONFIG_DISABLED";
+    public const string RoleInUse = "ROLE_IN_USE";
 
     // Auth proxy (AuthController → AuthHex, docs/11 §2.0)
     public const string AuthUpstreamError = "AUTH_UPSTREAM_ERROR";

Backend/ERPCore/appsettings.json

@@ -6,7 +6,7 @@
     }
   },
   "ConnectionStrings": {
-    "DefaultConnection": "Host=localhost;Port=5432;Database=ERPCore;Username=CHANGE_ME;Password=CHANGE_ME"
+    "DefaultConnection": "Host=localhost;Port=5432;Database=ERPCore;Username=root;Password=root"
   },
   "Auth": {
     "Issuer": "AuthHex",
@@ -16,7 +16,7 @@
     "RequiredRoleCode": ""
   },
   "AuthHex": {
-    "BaseUrl": "CHANGE_ME"
+    "BaseUrl": "http://localhost:5011"
   },
   "AllowedHosts": "*"
 }

Backend/PROGRESS.md

@@ -27,6 +27,7 @@ Convention: `docs/01-DOC-GUIDE.md §6`. Update this file in the **same commit**
 - [x] Item Type master (FR-MD-10) — CRUD + status + ETag; **unreferenced by design**, feeds the builder dropdown only
 - [x] SubCategory (FR-MD-04) — nested list/create under a category, `PUT`/`PATCH status` by id; `Item.subCategoryId` nullable FK, validated to belong to `categoryId`
 - [x] Product Configuration (FR-MD-11) — singleton `GET`/`PUT /product-config`; `CONFIG_DISABLED` gating on item writes
+- [x] Item **sale price** (FR-MD-01, 2026-07-22) — nullable `Item.SalePrice` (`numeric(18,4)`); on all Item DTOs (list/detail/create/update), validated `>= 0`. **Sales-only** — never enters GRN/FIFO/ledger. `null` ⇒ sell at stock value. Migration `AddItemSalePrice`. See the 2026-07-22 Done entry.
 
 > ### 2026-07-16 — Brands, Subcategories, Item Types, Product Config (migration #2)
 > Makes real three concepts the frontend had been faking on mock data (`Frontend/erp-system/lib/api/mock-data.ts`), per docs/10 §B.3.1 FR-MD-09/10/11 and docs/11 §2.3/2.6/2.7/2.8.
@@ -55,7 +56,7 @@ Convention: `docs/01-DOC-GUIDE.md §6`. Update this file in the **same commit**
 > Requisition/RFQ/PO implemented 2026-07-10. **Live smoke test PASSED** (docNo `PR/RFQ/PO-2026-#####` gap-controlled + incrementing, requestedBy/createdBy = seeded system user, RFQ comparison matrix, duplicate quotation→409, PO auto-approve + server-computed totals matching the spec example `112100/20178/132278`, edit-while-open with recomputed totals + ETag 200/412, PO_NOT_EDITABLE→409 on cancelled, cancel→200, bad reference→422). Same `[~]` reason as §1: the §6 security gate (auth + audit) is not yet wired.
 - [x] Requisition (+ lines) + submit (`POST /requisitions`, `/{id}/submit`, list, get)
 - [x] RFQ + quotations + comparison (`POST /rfqs`, `/{id}/quotations` [one per vendor], `GET /{id}/comparison` matrix)
-- [x] Purchase Order: create (auto-approve, `approvalRequired` flag), edit-while-open (If-Match), approve (no-op), cancel
+- [x] Purchase Order: create (auto-approve **or `saveAsDraft`**, `approvalRequired` flag), edit **Draft-only** (If-Match), **submit** (Draft→Approved), **delete** (Draft-only), approve (no-op), cancel — see the 2026-07-20 entry (FR-PROC-05 revised: draft-lock supersedes edit-while-open)
 - [x] Purchase Return (outbound movement, reason code) — `POST /purchase-returns` auto-posts an outbound FIFO consume via shared `StockMutator`; mandatory Return-context reason (`REASON_CODE_REQUIRED`→400, wrong context→422), references the GRN line for traceability, over-return→`409 STOCK_NEGATIVE_BLOCKED`. Verified. (Cumulative return-vs-received cap still relies on the stock-availability guard.)
 
 > **Deviation (recorded):** `VendorQuotation` is modelled as header + `VendorQuotationLine` (per-item pricing) to satisfy the API contract (docs/11 §3.2); docs/10 Part C.2's scalar `VENDOR_QUOTATION(unit_price, lead_days)` with no item ref cannot represent it. Update the ER model doc to match.
@@ -74,7 +75,8 @@ Convention: `docs/01-DOC-GUIDE.md §6`. Update this file in the **same commit**
 
 ## 3. Goods Receipt
 > Implemented + **smoke test PASSED** 2026-07-13 (see §4 note for the shared stock verification). Same `[~]` reason as §1/§2: the §6 auth+audit gate.
-- [x] GRN create (against PO / direct), over-receipt tolerance — `unitCost` **PO-derived server-side** (client `999` verified ignored → PO price used, 02-SECURITY C.3); direct receipt requires `vendorId` + entered cost (AR-04); over-receipt → `422 OVER_RECEIPT_TOLERANCE` (verified at open-qty boundary); batch created/reused per (item, batchNo). Serial capture deferred.
+- [x] GRN create (against PO / direct), over-receipt tolerance — `unitCost` **defaults to the PO price but is now overridable per line** (variance recorded vs `poUnitPrice` snapshot — 02-SECURITY C.3 revised 2026-07-20; the old "client cost ignored" block is gone); direct receipt requires `vendorId` + entered cost (AR-04); over-receipt → `422 OVER_RECEIPT_TOLERANCE` (verified at open-qty boundary); batch created/reused per (item, batchNo). Serial capture deferred. **Discount/VAT added** — see the 2026-07-20 entry.
+- [x] **Off-PO lines on a PO-based GRN** (FR-GRN-01, 2026-07-22) — a line with `poLineId: null` on a PO-based GRN is received like a direct line (entered `unitCost`, no over-receipt check, PO balances untouched). **No code change was needed** — `GrnService.CreateAsync` already branches per-line on `input.PoLineId is not null`; documented + frontend-enabled. Same review/audit surface as AR-04 (02-SECURITY C.3).
 - [x] GRN confirm → FIFO layer + ledger + PO `qtyReceived` (single UoW txn) — verified: layers+ledger posted, running balance, PO → PartiallyReceived/FullyReceived, UOM→base conversion (10 Box-12 → 120 base @10). **Idempotent** re-confirm verified (no double-post). Note: `Idempotency-Key` accepted but idempotency is resource-state based (already-Confirmed replays existing result); a keyed idempotency store is deferred.
 - [x] Inspection hold release / reject — Release fully verified (OnHold excluded from `available`, then released). Reject removes on-hand + posts a reversing ledger entry; formal link to a Purchase Return is deferred (§3.4).
 
@@ -111,6 +113,20 @@ Convention: `docs/01-DOC-GUIDE.md §6`. Update this file in the **same commit**
 ## Done
 <!-- move [x] items here with date + note if the active list grows long -->
 
+### 2026-07-22 — Item fixed sale price + GRN off-PO items (migration `AddItemSalePrice`)
+- **Item sale price (FR-MD-01).** New nullable `Item.SalePrice` (`numeric(18,4)`, `ItemConfiguration.HasPrecision(18,4)`), threaded through `ItemListItemDto`/`ItemDetailDto`/`CreateItemRequest`/`UpdateItemRequest` (`[Range(0, …)]`) and mapped in `ItemService` (create/update/`ToDetail`/list projection). **Sales-only** — it never touches `GrnService`, FIFO, `StockLayer`, or the ledger, so receipt/costing behaviour is byte-for-byte unchanged. `null` ⇒ "use stock value"; the fixed-vs-stock choice is a frontend toggle, not a server field (no `price_mode` enum). docs/10 C.1/C.9 + decision #14, docs/11 §2.1, 02-SECURITY C.1.
+- **GRN off-PO items (FR-GRN-01).** A PO-based GRN may now carry lines with `poLineId: null` (item not on the PO). **No backend change** — `GrnService.CreateAsync` already routed such lines through the direct-receipt path (entered cost, no over-receipt check, no PO-balance update). Documented as intended behaviour; the frontend now exposes it. docs/10 FR-GRN-01/C.3 (`po_line_id` nullable) + decision #15, docs/11 §4.1, 02-SECURITY C.3.
+- **Migration** `AddItemSalePrice` — single nullable column add; no backfill (`Down()` drops it). **Applied** to the local DB (`dotnet ef database update` → Done).
+- **Verified:** `dotnet build` clean (compile succeeded; the only earlier failure was the running dev exe holding a file lock, resolved by stopping it). Migration Up applied. Frontend `tsc --noEmit` clean. End-to-end runtime smoke (Swagger/UI) still to be run by the user.
+- **PO draft lifecycle (FR-PROC-05 revised).** `CreatePurchaseOrderRequest.SaveAsDraft` (default `false` → auto-approve unchanged; `true` → `Draft`). New `POST /purchase-orders/{id}/submit` (Draft→Approved, else `409 PO_NOT_EDITABLE`) and `DELETE /purchase-orders/{id}` (Draft-only, else 409). `IsEditable` narrowed from "not FullyReceived/Closed/Cancelled" to **`Draft` only** — so `PUT` now 409s on any submitted PO. **Option B ("freely edit while open") is superseded**; docs/10 FR-PROC-05, docs/11 §3.3 updated. ⚠️ **Every pre-existing PO is `Approved` and therefore now uneditable/undeletable** — intended, not a regression. No schema change (reuses the existing `Draft` enum value).
+- **GRN discount + VAT + price override.** `GrnLine` gained `PoUnitPrice`(nullable snapshot), `DiscountPct`, `NetUnitCost`, `VatPct`, `VatAmount`, `LineTotal`. All derived figures **server-computed**, never client-supplied. FIFO layer + ledger now cost at **`NetUnitCost`** (after discount) — VAT is recoverable and never enters stock value (docs/10 FR-GRN-06 revised). For a PO line, `unitCost` defaults to the PO price but an entered override wins and a **variance** is recorded against `PoUnitPrice` (02-SECURITY C.3 revised — the "client cost ignored, decision locked" control is deliberately loosened; the variance trail + audit log are the compensating control). Multi-GRN-per-PO at differing prices (the 20/50/30 case) already worked via `openQty`/`QtyReceived` and is untouched.
+- **Migration** `AddGrnPricingAndPoDraft` — hand-added a data backfill (`UPDATE grn_lines SET NetUnitCost = UnitCost, LineTotal = ReceivedValue`) so existing GRN lines stay consistent with their already-posted FIFO layers; `PoUnitPrice` left NULL for historical rows (no retroactive variance). `Down()` drops the six columns cleanly.
+- **Verified:** `dotnet build` clean (0/0); migration **Up and Down** exercised against the live DB (rollback to `AddRolesNavPermissions` then re-apply — both `Done`). **Runtime end-to-end PASSED — 22/22 assertions** (Node script, register→cookie session): PO draft→edit→submit→edit/delete-locked (409), draft delete (204→404), plain create still auto-approves; **costing proof** (100 @10, 10% disc, 18% VAT → net 9.00, receivedValue 900, VAT 162, lineTotal 1062, **FIFO layer @9.00, valuation 900 — VAT absent from stock**); multi-GRN 20@10/50@11/30@12 → variances +50/+60, PO FullyReceived, blended valuation 2010.
+
+### 2026-07-20 (2) — Procurement sidebar submenu (migration `AddProcurementSubNav`)
+- The sidebar submenu is driven by seeded `SubNavItem` rows + `GET /auth/me` navCodes; only Products/Settings had children, so **Purchase Orders had no sidebar section**. Added 4 `SubNavItem`s (ids 9–12, `NavItemId 4`) + 4 `Permission`s (ids 19–22) for Requisitions/RFQs/Purchase Orders/Purchase Returns via `AddProcurementSubNav`. The migration also grants the 4 to any role already holding the parent `NAV:procurement` (raw SQL, `ON CONFLICT DO NOTHING`); `Down()` removes the grants then the rows.
+- **Found:** the `Admin` role (`RoleId 2`) was never granted `NAV:procurement` at all (nor Vendors), so its whole Procurement branch was hidden — granted the parent + 4 children directly. **Verified:** `/auth/me` for Admin returns `procurement` + all 4 children; frontend `tsc`/`eslint` clean.
+
 ### 2026-07-09 — Bootstrap verified + Master Data (§1) implemented
 - Bootstrap scaffolding confirmed against 00-CORE §5 (solution, packages, `Program.cs` wiring, UoW, generic repo, `ICurrentUser`, ProblemDetails handler). Added enum-as-string JSON (`JsonStringEnumConverter`) and registered the 5 master-data services.
 - Domain: 3 enums (`ItemType`, `TrackingMode`, `EntityStatus`) + 8 entities (Category, Uom, UomConversion, Item, ItemReorder, Vendor, Warehouse, Bin) with one `IEntityTypeConfiguration` each; FKs `Restrict` (masters deactivate, not cascade-delete), unique indexes (SKU, vendor/warehouse code, uom name, bin code per-warehouse), decimal precision, `xmin` concurrency token on Item/Vendor.

Frontend/PROGRESS.md

@@ -27,7 +27,7 @@ Convention: `docs/01-DOC-GUIDE.md §6`. Update this file in the **same commit**
 - [~] Forgot password — change password screen — UI built (`app/login/forgot/reset`); not yet wired to API
 
 ## 2. Master Data screens
-- [~] Items (`app/dashboard/products` list + filters, `/new` create, `/[id]` full edit + ETag/If-Match with 412-conflict handling + activate/deactivate) — FR-MD-01/08. Reused the pre-existing "Products" sidebar entry/stub route rather than adding a new nav item. **2026-07-15, rebuilt twice this session — see the two same-day entries below for the full history; current state:** `/new` is now Category → Subcategory (always visible, disabled with "No subcategories" when the category has none) → Brand → a checkbox-driven **variant builder** sourced live from `variantCategoriesApi`, with no SKU/Name/Description/Default vendor/Tax class/Item type/Tracking mode/Base UOM fields left on the form at all (Item type/tracking mode/base UOM are now fixed constants — `"Stocked"`/`"None"`/`uomId 1` — baked into the submit call, not user-facing). Checking a category (Color, Size, or any custom one) reveals its value-entry UI; Color gets a native color picker + a required name field (stored internally as `"name|hex"`, decoded everywhere it's displayed/used for SKU) while every other category is free-text chips. A flat table (one column per checked category + SKU + Quantity) generalizes to any number of active categories via a cartesian-product `useMemo`, replacing the earlier hardcoded 2-column Color×Size matrix. Submitting loops `itemsApi.create()` once per combination; SKU is `<CategoryCode>-<value1Code>-<value2Code>...`; item name is `<Brand> <Category> - <value1>/<value2>...`. Added optional `brandId`/`initialQty` to `Item`/`CreateItemRequest`/`ItemListItem` (`types/master-data.ts`) — **deviation:** neither field is in the documented Item DTO (`docs/11-BACKEND-PHASE1.md` §2.1); `initialQty` is captured but not wired into the Stock Core ledger (informational only, no warehouse/GRN behind it).
+- [~] Items (`app/dashboard/products` list + filters, `/new` create, `/[id]` full edit + ETag/If-Match with 412-conflict handling + activate/deactivate) — FR-MD-01/08. **2026-07-22:** `/new` gained a **"Fixed price / Use stock value" sale-price toggle** — see the 2026-07-22 entry. Reused the pre-existing "Products" sidebar entry/stub route rather than adding a new nav item. **2026-07-15, rebuilt twice this session — see the two same-day entries below for the full history; current state:** `/new` is now Category → Subcategory (always visible, disabled with "No subcategories" when the category has none) → Brand → a checkbox-driven **variant builder** sourced live from `variantCategoriesApi`, with no SKU/Name/Description/Default vendor/Tax class/Item type/Tracking mode/Base UOM fields left on the form at all (Item type/tracking mode/base UOM are now fixed constants — `"Stocked"`/`"None"`/`uomId 1` — baked into the submit call, not user-facing). Checking a category (Color, Size, or any custom one) reveals its value-entry UI; Color gets a native color picker + a required name field (stored internally as `"name|hex"`, decoded everywhere it's displayed/used for SKU) while every other category is free-text chips. A flat table (one column per checked category + SKU + Quantity) generalizes to any number of active categories via a cartesian-product `useMemo`, replacing the earlier hardcoded 2-column Color×Size matrix. Submitting loops `itemsApi.create()` once per combination; SKU is `<CategoryCode>-<value1Code>-<value2Code>...`; item name is `<Brand> <Category> - <value1>/<value2>...`. Added optional `brandId`/`initialQty` to `Item`/`CreateItemRequest`/`ItemListItem` (`types/master-data.ts`) — **deviation:** neither field is in the documented Item DTO (`docs/11-BACKEND-PHASE1.md` §2.1); `initialQty` is captured but not wired into the Stock Core ledger (informational only, no warehouse/GRN behind it).
 - [~] UOM + conversions (`app/dashboard/products/uoms` flat list + create dialog; conversions edited inline on the Item detail page via `PUT /items/{itemId}/uom-conversions`) — FR-MD-02/03
 - [~] Categories (`app/dashboard/products/categories` indented tree view + create dialog with parent picker) — FR-MD-04. **2026-07-15:** added debounced search + Previous/Next pagination (`categoriesApi.list()` now takes `page`/`pageSize`/`q`/`sortOrder`, page size 5), matching the Vendor list's pagination pattern.
 - [~] Brands (`app/dashboard/products/brands` list + create/edit dialog + delete) — **not a documented FR/endpoint**; `lib/api/brands.ts` treats it as a standalone name-only master, same shape as Categories, since Item has no `brandId` in the doc. **2026-07-15:** added the same debounced search + pagination as Categories; `Item`/`CreateItemRequest`/`ItemListItem` gained `brandId` so the new-item variant builder (above) can attach a brand.
@@ -39,12 +39,12 @@ Convention: `docs/01-DOC-GUIDE.md §6`. Update this file in the **same commit**
 ## 3. Procurement screens
 - [~] Requisition (`app/dashboard/procurement/requisitions` list, `/new` create, `/[id]` detail + Submit) — FR-PROC-01
 - [~] RFQ + quotations + comparison view (`.../rfqs` list, `/new` create with vendor multi-invite, `/[id]` detail: lines, comparison matrix, record-quotation form, "Create PO from vendor") — FR-PROC-02
-- [~] Purchase Order (`.../purchase-orders` list, `/new` create — auto-approved, prefillable from a Requisition or an RFQ+vendor quotation via query params — `/[id]` detail: edit-while-open with ETag/If-Match, Cancel with reason) — FR-PROC-03..07
+- [~] Purchase Order (`.../purchase-orders` list, `/new` create — **Save as draft** or **Create & submit** (auto-approve), prefillable from a Requisition or an RFQ+vendor quotation via query params — `/[id]` detail: **Draft** is editable (ETag/If-Match) with **Submit** + **Delete**; a submitted/open PO is read-only with **Cancel** (with reason)) — FR-PROC-03..07. **2026-07-20:** rewired to the draft lifecycle — `isPoEditable` is now `Draft`-only, `submit`/`remove` added to `lib/api/purchase-orders.ts`, `saveAsDraft` on the create request. See the 2026-07-20 entry.
 - [~] Purchase Return (`.../purchase-returns` list, `/new` create against a Confirmed/Closed GRN's lines) — FR-PROC-08; also reachable from a `Rejected` GRN line via a "Create Return" button on the GRN detail page
 
 ## 4. Receiving screens
 - [~] GRN list (`app/dashboard/receiving/grn/page.tsx`) — loading/empty/error states, links to detail
-- [~] GRN create (`app/dashboard/receiving/grn/new/page.tsx`) — "Against PO" (picks an Approved/PartiallyReceived PO, prefills open lines) and "Direct receipt" (vendor + manual lines) modes; per-line bin, qty, unit cost, hold status, and batch (batchNo+expiryDate) or serial-number-list capture driven by the item's `trackingMode`
+- [~] GRN create (`app/dashboard/receiving/grn/new/page.tsx`) — "Against PO" (picks an Approved/PartiallyReceived PO, prefills open lines) and "Direct receipt" (vendor + manual lines) modes; per-line bin, qty, unit cost, **discount % / VAT %** (with live after-discount/after-VAT line total + a per-row PO-price variance hint and a document total), hold status, and batch (batchNo+expiryDate) or serial-number-list capture driven by the item's `trackingMode`. **2026-07-20:** discount/VAT/variance added — see the 2026-07-20 entry. **2026-07-22:** "Add line" now works in **PO mode** (off-PO items) + **"New item"** (opens `/dashboard/products/new` in a new tab) + **refresh** icon — see the 2026-07-22 entry.
 - [~] GRN confirm (`app/dashboard/receiving/grn/[id]/page.tsx`) — renders returned `createdLayers`/`ledgerRefs`/`poStatus` as a confirmation panel (20-FRONTEND §4); sends a stable `Idempotency-Key` per detail-page session
 - [~] Inspection hold release / reject — Release/Reject buttons per on-hold line, shown once the GRN is `Confirmed`
 - Sidebar: added "Receiving" nav entry (`components/Layouts/AppSidebar.tsx`) → `/dashboard/receiving/grn`
@@ -90,6 +90,19 @@ Convention: `docs/01-DOC-GUIDE.md §6`. Update this file in the **same commit**
 ## Done
 <!-- move [x] items here with date + note if the active list grows long -->
 
+### 2026-07-22 — Item fixed sale price + GRN off-PO items / inline create
+- **Item sale-price toggle** (`app/dashboard/products/new/page.tsx`). New "Fixed price / Use stock value" segmented toggle (default **stock**). **Stock** sends `salePrice: null` on every created item. **Fixed** reveals a top "fix value" input that pre-fills a per-variant **Sale price** column (`priceFor(key) = pricesByKey[key] ?? fixValue`, so editing a row overrides only it while the rest follow the shared value); submit is blocked until **every** generated variant has a price `> 0` (`validateVariantPrices` in `lib/validations/master-data.ts`). Each variant's price rides its own `POST /items` in the existing non-transactional create loop. `types/master-data.ts`: `salePrice` added to `CreateItemRequest` (optional) and `Item`/`ItemListItem` (`number|null`).
+- **GRN off-PO items + inline create** (`app/dashboard/receiving/grn/new/page.tsx`). "Add line" is now shown in **both** PO and direct mode — an added PO-mode line has `poLineId: null` (editable item/UOM, `unitCost` required) and the server receives it as a direct line. New **"New item"** button opens `/dashboard/products/new` in a new browser tab (`window.open(..., "_blank", "noopener,noreferrer")` — the first new-tab pattern in the app), and a **refresh** icon (`refreshItems`) re-pulls `GET /items?status=Active` so the new item is selectable without reloading the in-progress GRN. Existing `validateLine` covers off-PO lines unchanged.
+- **Verified:** `tsc --noEmit` clean. Runtime browser verification (create fixed-priced variants; add an off-PO line + inline item on a PO GRN) is the next step.
+
+### 2026-07-20 — PO draft lifecycle + GRN discount/VAT/price-override (backend + frontend, same pass)
+- **PO draft lifecycle.** `lib/api/purchase-orders.ts`: `isPoEditable` narrowed to `status === "Draft"` (was the three-status exclusion); added `submit(poId)` and `remove(poId)`. `types/procurement.ts`: `saveAsDraft?` on `CreatePurchaseOrderRequest`; `UpdatePurchaseOrderRequest` now `Omit`s it. `/new`: the single "Create PO" button split into **Save as draft** / **Create & submit**. `/[id]`: **Draft** shows the editable line grid + **Submit** + **Delete draft**; an issued-but-open PO (`Approved`/`PartiallyReceived`) is read-only with **Cancel PO** (with reason, disabled once receipts exist); closed/cancelled are terminal. The old Cancel button was gated on `isPoEditable` — that would have shown Cancel only for Draft, so the affordances were re-split into `editable` (Draft) vs `cancellable` (Approved/PartiallyReceived).
+- **GRN discount/VAT/variance.** `types/grn.ts`: `discountPct`/`vatPct` on `CreateGrnLineInput`; `poUnitPrice`/`discountPct`/`netUnitCost`/`vatPct`/`vatAmount`/`lineTotal`/`priceVariance` on `GrnLine`. `/new`: per-line Disc %/VAT % inputs, a client mirror of the server arithmetic (`computeLine`, display-only — server stays authoritative) driving a live Line total + document total, and a PO-price variance hint when the entered unit cost differs from the prefilled PO price. `/[id]`: renders the full cost breakdown (unit cost + variance, disc %, net cost, received value, VAT, line total) and a stock-value/VAT/document-total footer. `lib/validations/grn.ts`: 0–100 range checks on the two percentages.
+- **Deliberately not touched:** the item picker already showed `sku — name` (the request's stated need); multi-GRN-per-PO and adding a non-PO item to a PO GRN already worked. Vendor stays PO-derived (non-selectable) for a PO-based GRN — selecting a different vendor than the PO's would be wrong.
+- **Select trigger showed the id, not the label (global fix).** Base UI's `Select.Value` renders the raw selected value unless the `Select.Root` is given an `items` map — the popup items unmount when closed, so their text isn't available to the trigger (confirmed in `@base-ui/react`'s `resolveSelectedLabel`, which `find`s `items` by value and only falls back to stringifying the value when none is supplied). Fixed once in the shared wrapper (`components/ui/select.tsx`): `Select` now walks its own `SelectItem` children and derives the `items` array automatically, so all ~60 `<SelectValue>` call sites across 26 files show the selected label without any per-site change. `tsc`/`eslint` clean; verified against Base UI's label-resolution source.
+- **Procurement sidebar submenu.** The sidebar builds submenus from backend-seeded `SubNavItem` rows filtered by `GET /auth/me`'s `navCodes`; only Products and Settings had children, so Purchase Orders had no sidebar section (only reachable via the Procurement hub card). Added a `children` array to the Procurement nav entry (`components/Layouts/AppSidebar.tsx`) — Requisitions, RFQs, Purchase Orders, Purchase Returns — matching new backend sub-nav codes. Also found the Admin role (`RoleId 2`) was never granted `NAV:procurement` at all, so the whole Procurement branch was hidden for it; granted the parent + 4 children. **Verified:** `/auth/me` for Admin now returns all five procurement codes → submenu renders. Stale PO hub-card copy ("freely editable while open") updated to the draft/submit wording.
+- **Verified:** `tsc --noEmit` clean; `eslint` unchanged from baseline (7 pre-existing `set-state-in-effect` on the PO/GRN screens before and after — 0 new issues, confirmed by stashing and re-counting). Runtime browser verification is the next step in this pass.
+
 ### 2026-07-17 — connected to the real API (mock-data.ts deleted)
 
 **The app now talks to ERPCore.** Every `lib/api/*.ts` module calls the backend; `lib/api/mock-data.ts` is gone. This is the pass the 2026-07-15 note anticipated.

Frontend/erp-system/app/dashboard/layout.tsx

@@ -2,6 +2,7 @@ import { AppSidebar } from "@/components/Layouts/AppSidebar"
 import { Header } from "@/components/Layouts/Header"
 import { Breadcrumbs } from "@/components/Layouts/Breadcrumbs"
 import { Toaster } from "@/components/ui/toast"
+import { AuthProvider } from "@/components/auth/AuthProvider"
 
 export default function DashboardLayout({
   children,
@@ -9,22 +10,24 @@ export default function DashboardLayout({
   children: React.ReactNode
 }) {
   return (
-    <div className="flex h-screen overflow-hidden bg-background">
-      <AppSidebar />
-      <main className="flex flex-1 flex-col">
-        <Header />
-        <div className="flex-1 overflow-auto">
-          <div className="p-6 lg:p-8">
-            <Breadcrumbs />
-            <div className="rounded-xl bg-card border border-gray-200 shadow-sm">
-              <div className="p-6">
-                {children}
+    <AuthProvider>
+      <div className="flex h-screen overflow-hidden bg-background">
+        <AppSidebar />
+        <main className="flex flex-1 flex-col">
+          <Header />
+          <div className="flex-1 overflow-auto">
+            <div className="p-6 lg:p-8">
+              <Breadcrumbs />
+              <div className="rounded-xl bg-card border border-gray-200 shadow-sm">
+                <div className="p-6">
+                  {children}
+                </div>
               </div>
             </div>
           </div>
-        </div>
-      </main>
-      <Toaster />
-    </div>
+        </main>
+        <Toaster />
+      </div>
+    </AuthProvider>
   )
 }

Frontend/erp-system/app/dashboard/procurement/page.tsx

@@ -18,7 +18,7 @@ const areas: { title: string; description: string; href: string; icon: LucideIco
   },
   {
     title: "Purchase Orders",
-    description: "Auto-approved on creation, freely editable while open, cancellable before receipt.",
+    description: "Save as draft (editable/deletable) or submit to lock; cancel an issued PO before receipt.",
     href: "/dashboard/procurement/purchase-orders",
     icon: ShoppingCart,
   },

Frontend/erp-system/app/dashboard/procurement/purchase-orders/[id]/page.tsx

@@ -3,7 +3,7 @@
 import { useEffect, useState } from "react"
 import { useParams, useRouter } from "next/navigation"
 import Link from "next/link"
-import { AlertTriangle, ArrowLeft, Ban, Plus, Save, Trash2 } from "lucide-react"
+import { AlertTriangle, ArrowLeft, Ban, Plus, Save, Send, Trash2 } from "lucide-react"
 
 import { isPoEditable, purchaseOrdersApi } from "@/lib/api/purchase-orders"
 import { warehousesApi } from "@/lib/api/warehouses"
@@ -65,6 +65,8 @@ export default function PurchaseOrderDetailPage() {
   const [showCancelForm, setShowCancelForm] = useState(false)
   const [cancelReason, setCancelReason] = useState("")
   const [cancelling, setCancelling] = useState(false)
+  const [submitting, setSubmitting] = useState(false)
+  const [deleting, setDeleting] = useState(false)
 
   function toDraftLines(order: PurchaseOrder): DraftLine[] {
     return order.lines.map((l) => ({
@@ -185,6 +187,39 @@ export default function PurchaseOrderDetailPage() {
     }
   }
 
+  async function handleSubmitPo() {
+    if (!po) return
+    setSaveError(null)
+    setSubmitting(true)
+    try {
+      const updated = await purchaseOrdersApi.submit(po.poId)
+      setPo(updated)
+      setLines(toDraftLines(updated))
+      toast.success("Purchase order submitted", `${updated.docNo} — now ${updated.status} and locked for editing.`)
+    } catch (err) {
+      setSaveError(errorMessage(err))
+      toast.error("Could not submit purchase order", errorMessage(err))
+    } finally {
+      setSubmitting(false)
+    }
+  }
+
+  async function handleDelete() {
+    if (!po) return
+    if (!window.confirm(`Delete draft ${po.docNo}? This cannot be undone.`)) return
+    setSaveError(null)
+    setDeleting(true)
+    try {
+      await purchaseOrdersApi.remove(po.poId)
+      toast.success("Draft deleted", po.docNo)
+      router.push("/dashboard/procurement/purchase-orders")
+    } catch (err) {
+      setSaveError(errorMessage(err))
+      toast.error("Could not delete purchase order", errorMessage(err))
+      setDeleting(false)
+    }
+  }
+
   async function handleCancel() {
     if (!po) return
     if (!cancelReason.trim()) {
@@ -226,6 +261,9 @@ export default function PurchaseOrderDetailPage() {
 
   const editable = isPoEditable(po.status) && !conflict
   const hasReceipts = po.lines.some((l) => l.qtyReceived > 0)
+  // A submitted-but-still-open PO (issued to the vendor) is cancellable with a reason;
+  // a Draft is deleted instead, and closed/cancelled POs are terminal.
+  const cancellable = po.status === "Approved" || po.status === "PartiallyReceived"
 
   return (
     <div className="flex flex-col gap-6">
@@ -245,18 +283,32 @@ export default function PurchaseOrderDetailPage() {
           </div>
         </div>
 
-        {isPoEditable(po.status) && !showCancelForm && (
-          <Button
-            variant="destructive"
-            size="lg"
-            onClick={() => setShowCancelForm(true)}
-            disabled={hasReceipts}
-            title={hasReceipts ? "Cannot cancel — this PO already has receipts against it" : undefined}
-          >
-            <Ban className="size-5" />
-            Cancel PO
-          </Button>
-        )}
+        <div className="flex items-center gap-3">
+          {po.status === "Draft" && (
+            <>
+              <Button variant="outline" size="lg" onClick={handleSubmitPo} disabled={submitting || deleting}>
+                <Send className="size-5" />
+                {submitting ? "Submitting…" : "Submit"}
+              </Button>
+              <Button variant="destructive" size="lg" onClick={handleDelete} disabled={deleting || submitting}>
+                <Trash2 className="size-5" />
+                {deleting ? "Deleting…" : "Delete draft"}
+              </Button>
+            </>
+          )}
+          {cancellable && !showCancelForm && (
+            <Button
+              variant="destructive"
+              size="lg"
+              onClick={() => setShowCancelForm(true)}
+              disabled={hasReceipts}
+              title={hasReceipts ? "Cannot cancel — this PO already has receipts against it" : undefined}
+            >
+              <Ban className="size-5" />
+              Cancel PO
+            </Button>
+          )}
+        </div>
       </div>
 
       {showCancelForm && (

Frontend/erp-system/app/dashboard/procurement/purchase-orders/new/page.tsx

@@ -43,8 +43,12 @@ function newKey() {
   return `poline-${keySeq}`
 }
 
+// Unit price and tax are no longer entered at PO creation — pricing is captured at GRN
+// receipt (with discount/VAT there). They default to 0 here and stay off the form, but
+// remain on the payload because the backend line DTO still requires them; a PO prefilled
+// from an RFQ keeps its negotiated price (below).
 function emptyLine(): DraftLine {
-  return { key: newKey(), itemId: null, uomId: null, warehouseId: null, qty: "", unitPrice: "", tax: "0.18" }
+  return { key: newKey(), itemId: null, uomId: null, warehouseId: null, qty: "", unitPrice: "0", tax: "0" }
 }
 
 function NewPurchaseOrderContent() {
@@ -98,8 +102,8 @@ function NewPurchaseOrderContent() {
                 uomId: null,
                 warehouseId: null,
                 qty: String(l.qty),
-                unitPrice: "",
-                tax: "0.18",
+                unitPrice: "0",
+                tax: "0",
               })
             )
           )
@@ -124,8 +128,8 @@ function NewPurchaseOrderContent() {
                 uomId: null,
                 warehouseId: null,
                 qty: String(l.qty),
-                unitPrice: cell ? String(cell.unitPrice) : "",
-                tax: "0.18",
+                unitPrice: cell ? String(cell.unitPrice) : "0",
+                tax: "0",
               }
             })
           )
@@ -151,7 +155,7 @@ function NewPurchaseOrderContent() {
     return items?.find((i) => i.itemId === itemId) ?? null
   }
 
-  async function handleSubmit() {
+  async function handleSubmit(saveAsDraft: boolean) {
     setHeaderError(null)
     setSubmitError(null)
 
@@ -197,8 +201,12 @@ function NewPurchaseOrderContent() {
         vendorId,
         requisitionId: requisitionId ?? (rfqId ? undefined : null),
         lines: payloadLines,
+        saveAsDraft,
       })
-      toast.success("Purchase order created", `${po.docNo} — auto-approved (FR-PROC-04).`)
+      toast.success(
+        "Purchase order created",
+        saveAsDraft ? `${po.docNo} — saved as draft.` : `${po.docNo} — auto-approved (FR-PROC-04).`
+      )
       router.push(`/dashboard/procurement/purchase-orders/${po.poId}`)
     } catch (err) {
       setSubmitError(errorMessage(err))
@@ -274,8 +282,6 @@ function NewPurchaseOrderContent() {
                       <TableHead className="h-12 w-28 px-3 text-sm">UOM</TableHead>
                       <TableHead className="h-12 w-40 px-3 text-sm">Warehouse</TableHead>
                       <TableHead className="h-12 w-24 px-3 text-sm">Qty</TableHead>
-                      <TableHead className="h-12 w-28 px-3 text-sm">Unit price</TableHead>
-                      <TableHead className="h-12 w-24 px-3 text-sm">Tax</TableHead>
                       <TableHead className="h-12 w-10 px-3" />
                     </TableRow>
                   </TableHeader>
@@ -348,30 +354,6 @@ function NewPurchaseOrderContent() {
                             />
                             <FieldError errors={[errors.qty ? { message: errors.qty } : undefined]} />
                           </TableCell>
-                          <TableCell className="px-3 py-3 align-top">
-                            <Input
-                              type="number"
-                              min="0"
-                              step="any"
-                              value={line.unitPrice}
-                              aria-invalid={!!errors.unitPrice}
-                              onChange={(e) => updateLine(line.key, { unitPrice: e.target.value })}
-                              className="h-11 text-base"
-                            />
-                            <FieldError errors={[errors.unitPrice ? { message: errors.unitPrice } : undefined]} />
-                          </TableCell>
-                          <TableCell className="px-3 py-3 align-top">
-                            <Input
-                              type="number"
-                              min="0"
-                              step="0.01"
-                              value={line.tax}
-                              aria-invalid={!!errors.tax}
-                              onChange={(e) => updateLine(line.key, { tax: e.target.value })}
-                              className="h-11 text-base"
-                            />
-                            <FieldError errors={[errors.tax ? { message: errors.tax } : undefined]} />
-                          </TableCell>
                           <TableCell className="px-3 py-3 align-top">
                             <Button type="button" variant="ghost" size="icon" onClick={() => removeLine(line.key)} aria-label="Remove line">
                               <Trash2 className="size-5" />
@@ -394,8 +376,11 @@ function NewPurchaseOrderContent() {
             <Link href="/dashboard/procurement/purchase-orders" className={cn(buttonVariants({ variant: "outline", size: "lg" }))}>
               Cancel
             </Link>
-            <Button size="lg" type="button" onClick={handleSubmit} disabled={submitting}>
-              {submitting ? "Creating…" : "Create PO"}
+            <Button size="lg" type="button" variant="outline" onClick={() => handleSubmit(true)} disabled={submitting}>
+              {submitting ? "Saving…" : "Save as draft"}
+            </Button>
+            <Button size="lg" type="button" onClick={() => handleSubmit(false)} disabled={submitting}>
+              {submitting ? "Creating…" : "Create & submit"}
             </Button>
           </div>
         </>

Frontend/erp-system/app/dashboard/products/[id]/page.tsx

@@ -3,17 +3,16 @@
 import { useEffect, useState } from "react"
 import { useParams, useRouter } from "next/navigation"
 import Link from "next/link"
-import { AlertTriangle, ArrowLeft, Plus, Save, Trash2 } from "lucide-react"
+import { AlertTriangle, ArrowLeft, Save } from "lucide-react"
 
 import { itemsApi } from "@/lib/api/items"
 import { categoriesApi } from "@/lib/api/categories"
 import { uomsApi } from "@/lib/api/uoms"
-import { vendorsApi } from "@/lib/api/vendors"
 import { warehousesApi } from "@/lib/api/warehouses"
 import { errorMessage, fieldErrors } from "@/lib/error-map"
-import { validateConversionLine, validateItemForm, validateReorderLine } from "@/lib/validations/master-data"
+import { validateItemForm } from "@/lib/validations/master-data"
 import { cn } from "@/lib/utils"
-import { Item, ItemReorderSetting, StockNature, TrackingMode, UomConversion } from "@/types/master-data"
+import { Item, StockNature, TrackingMode } from "@/types/master-data"
 
 import { Badge } from "@/components/ui/badge"
 import { Button, buttonVariants } from "@/components/ui/button"
@@ -21,30 +20,9 @@ import { Input } from "@/components/ui/input"
 import { Label } from "@/components/ui/label"
 import { FieldError } from "@/components/ui/field"
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select"
-import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from "@/components/ui/table"
 import { Skeleton } from "@/components/ui/skeleton"
 import { toast } from "@/components/ui/toast"
 
-interface ReorderDraft {
-  key: string
-  warehouseId: number | null
-  reorderPoint: string
-  reorderQty: string
-}
-
-interface ConversionDraft {
-  key: string
-  fromUom: number | null
-  toUom: number | null
-  factor: string
-}
-
-let keySeq = 0
-function newKey() {
-  keySeq += 1
-  return `row-${keySeq}`
-}
-
 export default function ItemDetailPage() {
   const params = useParams<{ id: string }>()
   const router = useRouter()
@@ -54,13 +32,13 @@ export default function ItemDetailPage() {
   const [etag, setEtag] = useState<string | null>(null)
   const [categories, setCategories] = useState<{ categoryId: number; name: string }[]>([])
   const [uoms, setUoms] = useState<{ uomId: number; name: string }[]>([])
-  const [vendors, setVendors] = useState<{ vendorId: number; code: string; name: string }[]>([])
   const [warehouses, setWarehouses] = useState<{ warehouseId: number; code: string; name: string }[]>([])
   const [loadError, setLoadError] = useState<string | null>(null)
 
   // Basic info form
   const [sku, setSku] = useState("")
   const [name, setName] = useState("")
+  // No longer editable here — carried through unchanged so a save doesn't silently clear it.
   const [description, setDescription] = useState("")
   const [categoryId, setCategoryId] = useState<number | null>(null)
   // Carried through edits so a save doesn't silently drop the item's subcategory/brand.
@@ -68,10 +46,15 @@ export default function ItemDetailPage() {
   const [subCategoryId, setSubCategoryId] = useState<number | null>(null)
   const [brandId, setBrandId] = useState<number | null>(null)
   const [baseUomId, setBaseUomId] = useState<number | null>(null)
-  const [defaultVendorId, setDefaultVendorId] = useState<number | null>(null)
   const [stockNature, setStockNature] = useState<StockNature>("Stocked")
+  // Default vendor, tax class, and tracking mode are no longer editable on this page —
+  // carried through unchanged (from the loaded item) so a save doesn't silently clear them.
+  const [defaultVendorId, setDefaultVendorId] = useState<number | null>(null)
   const [trackingMode, setTrackingMode] = useState<TrackingMode>("None")
   const [taxClass, setTaxClass] = useState("")
+  // Frontend-only: there's no warehouse field anywhere on the Item contract, so this
+  // isn't sent on save — nothing to wire it to server-side.
+  const [warehouseId, setWarehouseId] = useState<number | null>(null)
 
   const [errors, setErrors] = useState<Record<string, string>>({})
   const [conflict, setConflict] = useState(false)
@@ -79,18 +62,6 @@ export default function ItemDetailPage() {
   const [saving, setSaving] = useState(false)
   const [togglingStatus, setTogglingStatus] = useState(false)
 
-  // Reorder settings
-  const [reorderLines, setReorderLines] = useState<ReorderDraft[]>([])
-  const [reorderErrors, setReorderErrors] = useState<Record<string, Record<string, string>>>({})
-  const [reorderSaveError, setReorderSaveError] = useState<string | null>(null)
-  const [savingReorder, setSavingReorder] = useState(false)
-
-  // UOM conversions
-  const [conversionLines, setConversionLines] = useState<ConversionDraft[]>([])
-  const [conversionErrors, setConversionErrors] = useState<Record<string, Record<string, string>>>({})
-  const [conversionSaveError, setConversionSaveError] = useState<string | null>(null)
-  const [savingConversions, setSavingConversions] = useState(false)
-
   function applyItem(data: Item) {
     setItem(data)
     setSku(data.sku)
@@ -104,8 +75,6 @@ export default function ItemDetailPage() {
     setStockNature(data.stockNature)
     setTrackingMode(data.trackingMode)
     setTaxClass(data.taxClass ?? "")
-    setReorderLines(data.reorder.map((r): ReorderDraft => ({ key: newKey(), warehouseId: r.warehouseId, reorderPoint: String(r.reorderPoint), reorderQty: String(r.reorderQty) })))
-    setConversionLines(data.conversions.map((c): ConversionDraft => ({ key: newKey(), fromUom: c.fromUom, toUom: c.toUom, factor: String(c.factor) })))
   }
 
   function load() {
@@ -123,11 +92,10 @@ export default function ItemDetailPage() {
   useEffect(() => {
     if (!Number.isFinite(itemId)) return
     load()
-    Promise.all([categoriesApi.list(), uomsApi.list(), vendorsApi.list({ pageSize: 200 }), warehousesApi.list()])
-      .then(([cat, uo, ve, wh]) => {
+    Promise.all([categoriesApi.list(), uomsApi.list(), warehousesApi.list({ pageSize: 200 })])
+      .then(([cat, uo, wh]) => {
         setCategories(cat.items)
         setUoms(uo.items)
-        setVendors(ve.items)
         setWarehouses(wh.items)
       })
       .catch(() => {})
@@ -183,83 +151,6 @@ export default function ItemDetailPage() {
     }
   }
 
-  function updateReorderLine(key: string, patch: Partial<ReorderDraft>) {
-    setReorderLines((prev) => prev.map((l) => (l.key === key ? { ...l, ...patch } : l)))
-  }
-  function removeReorderLine(key: string) {
-    setReorderLines((prev) => prev.filter((l) => l.key !== key))
-  }
-
-  async function handleSaveReorder() {
-    if (!item) return
-    setReorderSaveError(null)
-    const nextErrors: Record<string, Record<string, string>> = {}
-    for (const line of reorderLines) {
-      const errs = validateReorderLine({ warehouseId: line.warehouseId, reorderPoint: line.reorderPoint, reorderQty: line.reorderQty })
-      if (Object.keys(errs).length > 0) nextErrors[line.key] = errs
-    }
-    setReorderErrors(nextErrors)
-    if (Object.keys(nextErrors).length > 0) {
-      setReorderSaveError("Fix the highlighted rows before saving.")
-      return
-    }
-
-    const settings: ItemReorderSetting[] = reorderLines.map((l) => ({
-      warehouseId: l.warehouseId as number,
-      reorderPoint: Number(l.reorderPoint),
-      reorderQty: Number(l.reorderQty),
-    }))
-
-    setSavingReorder(true)
-    try {
-      const result = await itemsApi.updateReorder(item.itemId, { settings })
-      setItem((prev) => (prev ? { ...prev, reorder: result.settings } : prev))
-      toast.success("Reorder settings saved")
-    } catch (err) {
-      setReorderSaveError(errorMessage(err))
-      toast.error("Could not save reorder settings", errorMessage(err))
-    } finally {
-      setSavingReorder(false)
-    }
-  }
-
-  function updateConversionLine(key: string, patch: Partial<ConversionDraft>) {
-    setConversionLines((prev) => prev.map((l) => (l.key === key ? { ...l, ...patch } : l)))
-  }
-  function removeConversionLine(key: string) {
-    setConversionLines((prev) => prev.filter((l) => l.key !== key))
-  }
-
-  async function handleSaveConversions() {
-    if (!item) return
-    setConversionSaveError(null)
-    const nextErrors: Record<string, Record<string, string>> = {}
-    for (const line of conversionLines) {
-      const errs = validateConversionLine({ fromUom: line.fromUom, toUom: line.toUom, factor: line.factor })
-      if (Object.keys(errs).length > 0) nextErrors[line.key] = errs
-    }
-    setConversionErrors(nextErrors)
-    if (Object.keys(nextErrors).length > 0) {
-      setConversionSaveError("Fix the highlighted rows before saving.")
-      return
-    }
-
-    const conversions = conversionLines.map((l) => ({ fromUom: l.fromUom as number, toUom: l.toUom as number, factor: Number(l.factor) }))
-
-    setSavingConversions(true)
-    try {
-      const result = await itemsApi.updateUomConversions(item.itemId, { conversions })
-      setItem((prev) => (prev ? { ...prev, conversions: result.conversions } : prev))
-      setConversionLines(result.conversions.map((c: UomConversion): ConversionDraft => ({ key: newKey(), fromUom: c.fromUom, toUom: c.toUom, factor: String(c.factor) })))
-      toast.success("UOM conversions saved")
-    } catch (err) {
-      setConversionSaveError(errorMessage(err))
-      toast.error("Could not save UOM conversions", errorMessage(err))
-    } finally {
-      setSavingConversions(false)
-    }
-  }
-
   function uomName(uomId: number) {
     return uoms.find((u) => u.uomId === uomId)?.name ?? `#${uomId}`
   }
@@ -339,13 +230,14 @@ export default function ItemDetailPage() {
             <Input value={name} onChange={(e) => setName(e.target.value)} aria-invalid={!!errors.name} className="h-12 text-base" disabled={conflict} />
             <FieldError errors={[errors.name ? { message: errors.name } : undefined]} />
           </div>
-          <div className="flex flex-col gap-2 sm:col-span-2">
-            <Label className="text-base">Description</Label>
-            <Input value={description} onChange={(e) => setDescription(e.target.value)} className="h-12 text-base" disabled={conflict} />
-          </div>
           <div className="flex flex-col gap-2">
             <Label className="text-base">Category</Label>
-            <Select<number | null> value={categoryId} onValueChange={setCategoryId} disabled={conflict}>
+            <Select<number | null>
+              value={categoryId}
+              onValueChange={setCategoryId}
+              disabled={conflict}
+              items={categories.map((c) => ({ label: c.name, value: c.categoryId }))}
+            >
               <SelectTrigger className="h-12! w-full text-base" aria-invalid={!!errors.categoryId}>
                 <SelectValue placeholder="Select category" />
               </SelectTrigger>
@@ -361,7 +253,12 @@ export default function ItemDetailPage() {
           </div>
           <div className="flex flex-col gap-2">
             <Label className="text-base">Base UOM</Label>
-            <Select<number | null> value={baseUomId} onValueChange={setBaseUomId} disabled={conflict}>
+            <Select<number | null>
+              value={baseUomId}
+              onValueChange={setBaseUomId}
+              disabled={conflict}
+              items={uoms.map((u) => ({ label: u.name, value: u.uomId }))}
+            >
               <SelectTrigger className="h-12! w-full text-base" aria-invalid={!!errors.baseUomId}>
                 <SelectValue placeholder="Select base UOM" />
               </SelectTrigger>
@@ -375,25 +272,6 @@ export default function ItemDetailPage() {
             </Select>
             <FieldError errors={[errors.baseUomId ? { message: errors.baseUomId } : undefined]} />
           </div>
-          <div className="flex flex-col gap-2">
-            <Label className="text-base">Default vendor</Label>
-            <Select<number | null> value={defaultVendorId} onValueChange={setDefaultVendorId} disabled={conflict}>
-              <SelectTrigger className="h-12! w-full text-base">
-                <SelectValue placeholder="None" />
-              </SelectTrigger>
-              <SelectContent>
-                {vendors.map((v) => (
-                  <SelectItem key={v.vendorId} value={v.vendorId} className="text-base">
-                    {v.code} — {v.name}
-                  </SelectItem>
-                ))}
-              </SelectContent>
-            </Select>
-          </div>
-          <div className="flex flex-col gap-2">
-            <Label className="text-base">Tax class</Label>
-            <Input value={taxClass} onChange={(e) => setTaxClass(e.target.value)} className="h-12 text-base" disabled={conflict} />
-          </div>
           <div className="flex flex-col gap-2">
             {/* "Item type" now means a Color/Size dimension master — this field is the
                 stock-nature one it used to be confused with (docs/11 §8). */}
@@ -410,15 +288,22 @@ export default function ItemDetailPage() {
             </Select>
           </div>
           <div className="flex flex-col gap-2">
-            <Label className="text-base">Tracking mode</Label>
-            <Select<TrackingMode> value={trackingMode} onValueChange={(v) => v && setTrackingMode(v)} disabled={conflict}>
+            <Label className="text-base">Warehouse (optional)</Label>
+            <Select<number | null>
+              value={warehouseId}
+              onValueChange={setWarehouseId}
+              disabled={conflict}
+              items={warehouses.map((w) => ({ label: `${w.code} — ${w.name}`, value: w.warehouseId }))}
+            >
               <SelectTrigger className="h-12! w-full text-base">
-                <SelectValue />
+                <SelectValue placeholder="Select warehouse" />
               </SelectTrigger>
               <SelectContent>
-                <SelectItem value="None" className="text-base">None</SelectItem>
-                <SelectItem value="Batch" className="text-base">Batch</SelectItem>
-                <SelectItem value="Serial" className="text-base">Serial</SelectItem>
+                {warehouses.map((w) => (
+                  <SelectItem key={w.warehouseId} value={w.warehouseId} className="text-base">
+                    {w.code} — {w.name}
+                  </SelectItem>
+                ))}
               </SelectContent>
             </Select>
           </div>
@@ -434,165 +319,8 @@ export default function ItemDetailPage() {
         </div>
       </div>
 
-      <div className="flex flex-col gap-4 rounded-xl border p-5">
-        <div className="flex items-center justify-between">
-          <div>
-            <h2 className="text-base font-semibold text-foreground">Reorder settings</h2>
-            <p className="text-sm text-muted-foreground">Per-warehouse reorder point and quantity (FR-MD-05).</p>
-          </div>
-          <Button type="button" variant="outline" onClick={() => setReorderLines((prev) => [...prev, { key: newKey(), warehouseId: null, reorderPoint: "", reorderQty: "" }])}>
-            <Plus className="size-5" />
-            Add row
-          </Button>
-        </div>
-
-        {reorderLines.length > 0 && (
-          <Table className="text-base">
-            <TableHeader>
-              <TableRow>
-                <TableHead className="h-12 px-3 text-sm">Warehouse</TableHead>
-                <TableHead className="h-12 px-3 text-sm">Reorder point</TableHead>
-                <TableHead className="h-12 px-3 text-sm">Reorder qty</TableHead>
-                <TableHead className="h-12 w-10 px-3" />
-              </TableRow>
-            </TableHeader>
-            <TableBody>
-              {reorderLines.map((line) => {
-                const errs = reorderErrors[line.key] ?? {}
-                return (
-                  <TableRow key={line.key}>
-                    <TableCell className="px-3 py-3 align-top">
-                      <Select<number | null> value={line.warehouseId} onValueChange={(v) => updateReorderLine(line.key, { warehouseId: v })}>
-                        <SelectTrigger className="h-11! w-full text-base" aria-invalid={!!errs.warehouseId}>
-                          <SelectValue placeholder="Warehouse" />
-                        </SelectTrigger>
-                        <SelectContent>
-                          {warehouses.map((w) => (
-                            <SelectItem key={w.warehouseId} value={w.warehouseId} className="text-base">
-                              {w.code}
-                            </SelectItem>
-                          ))}
-                        </SelectContent>
-                      </Select>
-                      <FieldError errors={[errs.warehouseId ? { message: errs.warehouseId } : undefined]} />
-                    </TableCell>
-                    <TableCell className="px-3 py-3 align-top">
-                      <Input type="number" min="0" step="any" value={line.reorderPoint} aria-invalid={!!errs.reorderPoint} onChange={(e) => updateReorderLine(line.key, { reorderPoint: e.target.value })} className="h-11 text-base" />
-                      <FieldError errors={[errs.reorderPoint ? { message: errs.reorderPoint } : undefined]} />
-                    </TableCell>
-                    <TableCell className="px-3 py-3 align-top">
-                      <Input type="number" min="0" step="any" value={line.reorderQty} aria-invalid={!!errs.reorderQty} onChange={(e) => updateReorderLine(line.key, { reorderQty: e.target.value })} className="h-11 text-base" />
-                      <FieldError errors={[errs.reorderQty ? { message: errs.reorderQty } : undefined]} />
-                    </TableCell>
-                    <TableCell className="px-3 py-3 align-top">
-                      <Button type="button" variant="ghost" size="icon" onClick={() => removeReorderLine(line.key)} aria-label="Remove row">
-                        <Trash2 className="size-5" />
-                      </Button>
-                    </TableCell>
-                  </TableRow>
-                )
-              })}
-            </TableBody>
-          </Table>
-        )}
-
-        {reorderSaveError && (
-          <div className="rounded-lg border border-destructive/30 bg-destructive/5 p-4 text-base text-destructive">{reorderSaveError}</div>
-        )}
-
-        <div className="flex justify-end">
-          <Button type="button" onClick={handleSaveReorder} disabled={savingReorder}>
-            {savingReorder ? "Saving…" : "Save reorder settings"}
-          </Button>
-        </div>
-      </div>
-
-      <div className="flex flex-col gap-4 rounded-xl border p-5">
-        <div className="flex items-center justify-between">
-          <div>
-            <h2 className="text-base font-semibold text-foreground">UOM conversions</h2>
-            <p className="text-sm text-muted-foreground">Purchase/stock UOM → base UOM conversion factors (FR-MD-02/03).</p>
-          </div>
-          <Button type="button" variant="outline" onClick={() => setConversionLines((prev) => [...prev, { key: newKey(), fromUom: null, toUom: item.baseUomId, factor: "" }])}>
-            <Plus className="size-5" />
-            Add row
-          </Button>
-        </div>
-
-        {conversionLines.length > 0 && (
-          <Table className="text-base">
-            <TableHeader>
-              <TableRow>
-                <TableHead className="h-12 px-3 text-sm">From UOM</TableHead>
-                <TableHead className="h-12 px-3 text-sm">To UOM</TableHead>
-                <TableHead className="h-12 px-3 text-sm">Factor</TableHead>
-                <TableHead className="h-12 w-10 px-3" />
-              </TableRow>
-            </TableHeader>
-            <TableBody>
-              {conversionLines.map((line) => {
-                const errs = conversionErrors[line.key] ?? {}
-                return (
-                  <TableRow key={line.key}>
-                    <TableCell className="px-3 py-3 align-top">
-                      <Select<number | null> value={line.fromUom} onValueChange={(v) => updateConversionLine(line.key, { fromUom: v })}>
-                        <SelectTrigger className="h-11! w-full text-base" aria-invalid={!!errs.fromUom}>
-                          <SelectValue placeholder="From" />
-                        </SelectTrigger>
-                        <SelectContent>
-                          {uoms.map((u) => (
-                            <SelectItem key={u.uomId} value={u.uomId} className="text-base">
-                              {u.name}
-                            </SelectItem>
-                          ))}
-                        </SelectContent>
-                      </Select>
-                      <FieldError errors={[errs.fromUom ? { message: errs.fromUom } : undefined]} />
-                    </TableCell>
-                    <TableCell className="px-3 py-3 align-top">
-                      <Select<number | null> value={line.toUom} onValueChange={(v) => updateConversionLine(line.key, { toUom: v })}>
-                        <SelectTrigger className="h-11! w-full text-base" aria-invalid={!!errs.toUom}>
-                          <SelectValue placeholder="To" />
-                        </SelectTrigger>
-                        <SelectContent>
-                          {uoms.map((u) => (
-                            <SelectItem key={u.uomId} value={u.uomId} className="text-base">
-                              {u.name}
-                            </SelectItem>
-                          ))}
-                        </SelectContent>
-                      </Select>
-                      <FieldError errors={[errs.toUom ? { message: errs.toUom } : undefined]} />
-                    </TableCell>
-                    <TableCell className="px-3 py-3 align-top">
-                      <Input type="number" min="0" step="any" value={line.factor} aria-invalid={!!errs.factor} onChange={(e) => updateConversionLine(line.key, { factor: e.target.value })} className="h-11 text-base" />
-                      <FieldError errors={[errs.factor ? { message: errs.factor } : undefined]} />
-                    </TableCell>
-                    <TableCell className="px-3 py-3 align-top">
-                      <Button type="button" variant="ghost" size="icon" onClick={() => removeConversionLine(line.key)} aria-label="Remove row">
-                        <Trash2 className="size-5" />
-                      </Button>
-                    </TableCell>
-                  </TableRow>
-                )
-              })}
-            </TableBody>
-          </Table>
-        )}
-
-        {conversionSaveError && (
-          <div className="rounded-lg border border-destructive/30 bg-destructive/5 p-4 text-base text-destructive">{conversionSaveError}</div>
-        )}
-
-        <div className="flex justify-end">
-          <Button type="button" onClick={handleSaveConversions} disabled={savingConversions}>
-            {savingConversions ? "Saving…" : "Save conversions"}
-          </Button>
-        </div>
-      </div>
-
       <p className="text-sm text-muted-foreground">
-        {uomName(item.baseUomId)} is the base UOM — every transaction converts to and stores quantities in base UOM (FR-MD-03). {warehouses.length === 0 && "No warehouses configured yet."}
+        {uomName(item.baseUomId)} is the base UOM — every transaction converts to and stores quantities in base UOM (FR-MD-03).
       </p>
     </div>
   )

Frontend/erp-system/app/dashboard/products/brands/page.tsx

@@ -2,13 +2,13 @@
 
 import { useEffect, useState } from "react"
 import Link from "next/link"
-import { ArrowLeft, Ban, CheckCircle2, ChevronLeft, ChevronRight, Pencil, Plus, Search, Tag } from "lucide-react"
+import { ArrowLeft, ArrowUp, ArrowDown, ArrowUpDown, Ban, CheckCircle2, ChevronLeft, ChevronRight, Pencil, Plus, Search, Tag } from "lucide-react"
 
 import { brandsApi } from "@/lib/api/brands"
 import { errorMessage } from "@/lib/error-map"
 import { validateBrandName } from "@/lib/validations/master-data"
 import { cn } from "@/lib/utils"
-import { PaginationMeta } from "@/types/common"
+import { EntityStatus, PaginationMeta } from "@/types/common"
 import { Brand } from "@/types/master-data"
 
 import { AlertDialog, AlertDialogContent, AlertDialogTrigger } from "@/components/ui/alert-dialog"
@@ -23,6 +23,8 @@ import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from "@
 import { toast } from "@/components/ui/toast"
 
 type SortOrder = "asc" | "desc"
+type SortKey = "brandId" | "name" | "status" | "createdAt"
+type StatusFilter = EntityStatus | "All"
 
 const PAGE_SIZE = 5
 
@@ -33,8 +35,12 @@ export default function BrandsPage() {
 
   const [searchInput, setSearchInput] = useState("")
   const [search, setSearch] = useState("")
-  const [sortOrder, setSortOrder] = useState<SortOrder>("asc")
+  const [status, setStatus] = useState<StatusFilter>("All")
   const [page, setPage] = useState(1)
+  // Sorts only the currently loaded page client-side — the backend ignores `sort` and
+  // always returns Name ascending, so this doesn't hold across page turns or other columns.
+  const [sortKey, setSortKey] = useState<SortKey>("name")
+  const [sortOrder, setSortOrder] = useState<SortOrder>("asc")
 
   const [open, setOpen] = useState(false)
   const [editing, setEditing] = useState<Brand | null>(null)
@@ -50,12 +56,12 @@ export default function BrandsPage() {
 
   useEffect(() => {
     setPage(1)
-  }, [search, sortOrder])
+  }, [search, status])
 
   function load() {
     setError(null)
     brandsApi
-      .list({ q: search || undefined, sort: sortOrder === "desc" ? "-name" : "name", page, pageSize: PAGE_SIZE })
+      .list({ q: search || undefined, status: status === "All" ? undefined : status, sort: "name", page, pageSize: PAGE_SIZE })
       .then((res) => {
         setBrands(res.items)
         setPagination(res.pagination)
@@ -63,9 +69,30 @@ export default function BrandsPage() {
       .catch((err) => setError(errorMessage(err)))
   }
 
-  useEffect(load, [search, sortOrder, page])
+  useEffect(load, [search, status, page])
 
-  const hasFilters = search.trim().length > 0
+  const hasFilters = search.trim().length > 0 || status !== "All"
+
+  const sortedBrands = brands
+    ? [...brands].sort((a, b) => {
+        const cmp =
+          sortKey === "brandId"
+            ? a.brandId - b.brandId
+            : sortKey === "createdAt"
+              ? new Date(a.createdAt).getTime() - new Date(b.createdAt).getTime()
+              : a[sortKey].localeCompare(b[sortKey])
+        return sortOrder === "asc" ? cmp : -cmp
+      })
+    : null
+
+  function toggleSort(key: SortKey) {
+    if (key === sortKey) {
+      setSortOrder((o) => (o === "asc" ? "desc" : "asc"))
+    } else {
+      setSortKey(key)
+      setSortOrder("asc")
+    }
+  }
 
   function openCreateDialog() {
     setEditing(null)
@@ -176,13 +203,14 @@ export default function BrandsPage() {
             aria-label="Search brands"
           />
         </div>
-        <Select<SortOrder> value={sortOrder} onValueChange={(v) => setSortOrder(v ?? "asc")}>
-          <SelectTrigger className="h-14! w-full flex-1 basis-0 text-base">
+        <Select<StatusFilter> value={status} onValueChange={(v) => setStatus(v ?? "All")}>
+          <SelectTrigger className="h-14! w-full sm:w-48 text-base">
             <SelectValue />
           </SelectTrigger>
           <SelectContent>
-            <SelectItem value="asc" className="text-base">Name (A–Z)</SelectItem>
-            <SelectItem value="desc" className="text-base">Name (Z–A)</SelectItem>
+            <SelectItem value="All" className="text-base">All statuses</SelectItem>
+            <SelectItem value="Active" className="text-base">Active</SelectItem>
+            <SelectItem value="Inactive" className="text-base">Inactive</SelectItem>
           </SelectContent>
         </Select>
       </div>
@@ -203,7 +231,7 @@ export default function BrandsPage() {
         <div className="flex flex-col items-center gap-4 rounded-xl border border-dashed py-20 text-center">
           <Tag className="size-12 text-muted-foreground" />
           <p className="text-base text-muted-foreground">
-            {hasFilters ? "No brands match your search." : "No brands yet."}
+            {hasFilters ? "No brands match your search/filter." : "No brands yet."}
           </p>
         </div>
       )}
@@ -213,15 +241,23 @@ export default function BrandsPage() {
           <Table className="text-base">
             <TableHeader className="bg-indigo-50">
               <TableRow className="hover:bg-indigo-50">
-                <TableHead className="h-12 px-3 text-sm text-indigo-700">ID</TableHead>
-                <TableHead className="h-12 px-3 text-sm text-indigo-700">Name</TableHead>
-                <TableHead className="h-12 px-3 text-sm text-indigo-700">Status</TableHead>
-                <TableHead className="h-12 px-3 text-sm text-indigo-700">Created At</TableHead>
+                <TableHead className="h-12 px-3 text-sm text-indigo-700">
+                  <SortableHeader label="ID" active={sortKey === "brandId"} order={sortOrder} onClick={() => toggleSort("brandId")} />
+                </TableHead>
+                <TableHead className="h-12 px-3 text-sm text-indigo-700">
+                  <SortableHeader label="Name" active={sortKey === "name"} order={sortOrder} onClick={() => toggleSort("name")} />
+                </TableHead>
+                <TableHead className="h-12 px-3 text-sm text-indigo-700">
+                  <SortableHeader label="Status" active={sortKey === "status"} order={sortOrder} onClick={() => toggleSort("status")} />
+                </TableHead>
+                <TableHead className="h-12 px-3 text-sm text-indigo-700">
+                  <SortableHeader label="Created At" active={sortKey === "createdAt"} order={sortOrder} onClick={() => toggleSort("createdAt")} />
+                </TableHead>
                 <TableHead className="h-12 px-3 text-sm text-indigo-700">Actions</TableHead>
               </TableRow>
             </TableHeader>
             <TableBody>
-              {brands.map((b) => (
+              {sortedBrands!.map((b) => (
                 <TableRow key={b.brandId}>
                   <TableCell className="px-3 py-3.5 text-muted-foreground">#{b.brandId}</TableCell>
                   <TableCell className="px-3 py-3.5 font-medium">{b.name}</TableCell>
@@ -313,3 +349,35 @@ export default function BrandsPage() {
     </div>
   )
 }
+
+function SortableHeader({
+  label,
+  active,
+  order,
+  onClick,
+}: {
+  label: string
+  active: boolean
+  order: SortOrder
+  onClick: () => void
+}) {
+  return (
+    <button
+      type="button"
+      className="flex items-center gap-1 hover:text-indigo-900"
+      onClick={onClick}
+      aria-label={`Sort by ${label}, ${active && order === "asc" ? "descending" : "ascending"}`}
+    >
+      {label}
+      {active ? (
+        order === "asc" ? (
+          <ArrowUp className="size-3.5" />
+        ) : (
+          <ArrowDown className="size-3.5" />
+        )
+      ) : (
+        <ArrowUpDown className="size-3.5 text-indigo-700/40" />
+      )}
+    </button>
+  )
+}

Frontend/erp-system/app/dashboard/products/categories/page.tsx

@@ -2,13 +2,13 @@
 
 import { useEffect, useState } from "react"
 import Link from "next/link"
-import { ArrowLeft, Ban, CheckCircle2, ChevronLeft, ChevronRight, ListTree, Network, Pencil, Plus, Search } from "lucide-react"
+import { ArrowLeft, ArrowDown, ArrowUp, ArrowUpDown, Ban, CheckCircle2, ChevronLeft, ChevronRight, ListTree, Network, Pencil, Plus, Search } from "lucide-react"
 
 import { categoriesApi } from "@/lib/api/categories"
 import { errorMessage } from "@/lib/error-map"
 import { validateCategoryName } from "@/lib/validations/master-data"
 import { cn } from "@/lib/utils"
-import { PaginationMeta } from "@/types/common"
+import { EntityStatus, PaginationMeta } from "@/types/common"
 import { Category } from "@/types/master-data"
 
 import { AlertDialog, AlertDialogContent, AlertDialogTrigger } from "@/components/ui/alert-dialog"
@@ -23,6 +23,8 @@ import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from "@
 import { toast } from "@/components/ui/toast"
 
 type SortOrder = "asc" | "desc"
+type SortKey = "categoryId" | "name" | "status" | "createdAt"
+type StatusFilter = EntityStatus | "All"
 
 const PAGE_SIZE = 5
 
@@ -33,8 +35,12 @@ export default function CategoriesPage() {
 
   const [searchInput, setSearchInput] = useState("")
   const [search, setSearch] = useState("")
-  const [sortOrder, setSortOrder] = useState<SortOrder>("asc")
+  const [status, setStatus] = useState<StatusFilter>("All")
   const [page, setPage] = useState(1)
+  // Sorts only the currently loaded page client-side — the backend ignores `sort` and
+  // always returns Name ascending, so this doesn't hold across page turns or other columns.
+  const [sortKey, setSortKey] = useState<SortKey>("name")
+  const [sortOrder, setSortOrder] = useState<SortOrder>("asc")
 
   const [open, setOpen] = useState(false)
   const [editing, setEditing] = useState<Category | null>(null)
@@ -50,12 +56,12 @@ export default function CategoriesPage() {
 
   useEffect(() => {
     setPage(1)
-  }, [search, sortOrder])
+  }, [search, status])
 
   function load() {
     setError(null)
     categoriesApi
-      .list({ q: search || undefined, sort: sortOrder === "desc" ? "-name" : "name", page, pageSize: PAGE_SIZE })
+      .list({ q: search || undefined, status: status === "All" ? undefined : status, sort: "name", page, pageSize: PAGE_SIZE })
       .then((res) => {
         setCategories(res.items)
         setPagination(res.pagination)
@@ -63,9 +69,30 @@ export default function CategoriesPage() {
       .catch((err) => setError(errorMessage(err)))
   }
 
-  useEffect(load, [search, sortOrder, page])
+  useEffect(load, [search, status, page])
 
-  const hasFilters = search.trim().length > 0
+  const hasFilters = search.trim().length > 0 || status !== "All"
+
+  const sortedCategories = categories
+    ? [...categories].sort((a, b) => {
+        const cmp =
+          sortKey === "categoryId"
+            ? a.categoryId - b.categoryId
+            : sortKey === "createdAt"
+              ? new Date(a.createdAt).getTime() - new Date(b.createdAt).getTime()
+              : a[sortKey].localeCompare(b[sortKey])
+        return sortOrder === "asc" ? cmp : -cmp
+      })
+    : null
+
+  function toggleSort(key: SortKey) {
+    if (key === sortKey) {
+      setSortOrder((o) => (o === "asc" ? "desc" : "asc"))
+    } else {
+      setSortKey(key)
+      setSortOrder("asc")
+    }
+  }
 
   function openCreateDialog() {
     setEditing(null)
@@ -175,13 +202,14 @@ export default function CategoriesPage() {
             aria-label="Search categories"
           />
         </div>
-        <Select<SortOrder> value={sortOrder} onValueChange={(v) => setSortOrder(v ?? "asc")}>
-          <SelectTrigger className="h-14! w-full flex-1 basis-0 text-base">
+        <Select<StatusFilter> value={status} onValueChange={(v) => setStatus(v ?? "All")}>
+          <SelectTrigger className="h-14! w-full sm:w-48 text-base">
             <SelectValue />
           </SelectTrigger>
           <SelectContent>
-            <SelectItem value="asc" className="text-base">Name (A–Z)</SelectItem>
-            <SelectItem value="desc" className="text-base">Name (Z–A)</SelectItem>
+            <SelectItem value="All" className="text-base">All statuses</SelectItem>
+            <SelectItem value="Active" className="text-base">Active</SelectItem>
+            <SelectItem value="Inactive" className="text-base">Inactive</SelectItem>
           </SelectContent>
         </Select>
       </div>
@@ -202,7 +230,7 @@ export default function CategoriesPage() {
         <div className="flex flex-col items-center gap-4 rounded-xl border border-dashed py-20 text-center">
           <ListTree className="size-12 text-muted-foreground" />
           <p className="text-base text-muted-foreground">
-            {hasFilters ? "No categories match your search." : "No categories yet."}
+            {hasFilters ? "No categories match your search/filter." : "No categories yet."}
           </p>
         </div>
       )}
@@ -212,15 +240,23 @@ export default function CategoriesPage() {
           <Table className="text-base">
             <TableHeader className="bg-indigo-50">
               <TableRow className="hover:bg-indigo-50">
-                <TableHead className="h-12 px-3 text-sm text-indigo-700">ID</TableHead>
-                <TableHead className="h-12 px-3 text-sm text-indigo-700">Name</TableHead>
-                <TableHead className="h-12 px-3 text-sm text-indigo-700">Status</TableHead>
-                <TableHead className="h-12 px-3 text-sm text-indigo-700">Created At</TableHead>
+                <TableHead className="h-12 px-3 text-sm text-indigo-700">
+                  <SortableHeader label="ID" active={sortKey === "categoryId"} order={sortOrder} onClick={() => toggleSort("categoryId")} />
+                </TableHead>
+                <TableHead className="h-12 px-3 text-sm text-indigo-700">
+                  <SortableHeader label="Name" active={sortKey === "name"} order={sortOrder} onClick={() => toggleSort("name")} />
+                </TableHead>
+                <TableHead className="h-12 px-3 text-sm text-indigo-700">
+                  <SortableHeader label="Status" active={sortKey === "status"} order={sortOrder} onClick={() => toggleSort("status")} />
+                </TableHead>
+                <TableHead className="h-12 px-3 text-sm text-indigo-700">
+                  <SortableHeader label="Created At" active={sortKey === "createdAt"} order={sortOrder} onClick={() => toggleSort("createdAt")} />
+                </TableHead>
                 <TableHead className="h-12 px-3 text-sm text-indigo-700">Actions</TableHead>
               </TableRow>
             </TableHeader>
             <TableBody>
-              {categories.map((c) => (
+              {sortedCategories!.map((c) => (
                 <TableRow key={c.categoryId}>
                   <TableCell className="px-3 py-3.5 text-muted-foreground">#{c.categoryId}</TableCell>
                   <TableCell className="px-3 py-3.5 font-medium">{c.name}</TableCell>
@@ -320,3 +356,35 @@ export default function CategoriesPage() {
     </div>
   )
 }
+
+function SortableHeader({
+  label,
+  active,
+  order,
+  onClick,
+}: {
+  label: string
+  active: boolean
+  order: SortOrder
+  onClick: () => void
+}) {
+  return (
+    <button
+      type="button"
+      className="flex items-center gap-1 hover:text-indigo-900"
+      onClick={onClick}
+      aria-label={`Sort by ${label}, ${active && order === "asc" ? "descending" : "ascending"}`}
+    >
+      {label}
+      {active ? (
+        order === "asc" ? (
+          <ArrowUp className="size-3.5" />
+        ) : (
+          <ArrowDown className="size-3.5" />
+        )
+      ) : (
+        <ArrowUpDown className="size-3.5 text-indigo-700/40" />
+      )}
+    </button>
+  )
+}

Frontend/erp-system/app/dashboard/products/new/page.tsx

@@ -11,10 +11,11 @@ import { brandsApi } from "@/lib/api/brands"
 import { itemTypesApi } from "@/lib/api/item-types"
 import { productConfig } from "@/lib/api/product-config"
 import { uomsApi } from "@/lib/api/uoms"
+import { warehousesApi } from "@/lib/api/warehouses"
 import { errorMessage } from "@/lib/error-map"
-import { validateItemTypeName, validateVariantItemForm } from "@/lib/validations/master-data"
+import { validateVariantItemForm, validateVariantPrices } from "@/lib/validations/master-data"
 import { cn } from "@/lib/utils"
-import { Brand, Category, ItemType, ProductConfig, SubCategory } from "@/types/master-data"
+import { Brand, Category, ItemType, ProductConfig, StockNature, SubCategory } from "@/types/master-data"
 
 import { Badge } from "@/components/ui/badge"
 import { Button, buttonVariants } from "@/components/ui/button"
@@ -36,26 +37,11 @@ function buildVariantSku(categoryLabel: string, values: string[]): string {
   return [skuSegment(categoryLabel, 3), ...values.map((v) => skuSegment(v, 3))].join("-")
 }
 
-/**
- * Colour is special-cased by name. This stays a frontend concern: item types are names
- * only — there is no value table server-side to hang a hex column off (docs/10 Part C.9).
- */
-function isColorCategory(categoryName: string): boolean {
-  return categoryName.trim().toLowerCase() === "color"
-}
-
-function encodeColorValue(name: string, hex: string): string {
-  return `${name}|${hex}`
-}
-
-function decodeColorValue(value: string): { name: string; hex: string } {
-  const separatorIndex = value.indexOf("|")
-  if (separatorIndex === -1) return { name: value, hex: "#d4d4d8" }
-  return { name: value.slice(0, separatorIndex), hex: value.slice(separatorIndex + 1) }
-}
-
-function partLabel(part: { name: string; value: string }): string {
-  return isColorCategory(part.name) ? decodeColorValue(part.value).name : part.value
+/** The item builder only ever offers these two dimensions, regardless of what else exists
+ * in the Item Types master list. */
+const BUILDER_ITEM_TYPES = ["color", "size"]
+function isBuilderItemType(name: string): boolean {
+  return BUILDER_ITEM_TYPES.includes(name.trim().toLowerCase())
 }
 
 export default function NewItemPage() {
@@ -65,48 +51,60 @@ export default function NewItemPage() {
   const [brands, setBrands] = useState<Brand[] | null>(null)
   const [itemTypes, setItemTypes] = useState<ItemType[] | null>(null)
   const [config, setConfig] = useState<ProductConfig | null>(null)
-  /**
-   * This form has no Base UOM field by design, so it adopts the first UOM as the base.
-   * It used to hardcode `uomId: 1`, which only worked because the mock seeded that id —
-   * against a real database that is a 422 waiting to happen, or worse, silently the wrong
-   * unit. Null here means "no UOM exists yet" and the form says so rather than guessing.
-   */
+  const [uoms, setUoms] = useState<{ uomId: number; name: string }[]>([])
+  /** Defaults to the first UOM once loaded; null only means none exist yet. */
   const [baseUomId, setBaseUomId] = useState<number | null>(null)
+  const [stockNature, setStockNature] = useState<StockNature>("Stocked")
   const [loadError, setLoadError] = useState<string | null>(null)
 
   const [categoryId, setCategoryId] = useState<number | null>(null)
   const [subCategories, setSubCategories] = useState<SubCategory[]>([])
   const [subCategoryId, setSubCategoryId] = useState<number | null>(null)
   const [brandId, setBrandId] = useState<number | null>(null)
+  // Frontend-only: there's no warehouse field anywhere on the Item contract, so this
+  // isn't sent on submit — nothing to wire it to server-side.
+  const [warehouses, setWarehouses] = useState<{ warehouseId: number; code: string; name: string }[]>([])
+  const [warehouseId, setWarehouseId] = useState<number | null>(null)
 
   const [checkedItemTypeIds, setCheckedItemTypeIds] = useState<number[]>([])
   const [valuesByCategory, setValuesByCategory] = useState<Record<number, string[]>>({})
   const [inputByCategory, setInputByCategory] = useState<Record<number, string>>({})
-  const [colorNameByCategory, setColorNameByCategory] = useState<Record<number, string>>({})
+  // Lets a specific generated combination be dropped from the preview table before
+  // submit, without having to remove and re-add the whole value that produced it.
+  const [removedVariantKeys, setRemovedVariantKeys] = useState<Set<string>>(new Set())
 
-  const [addingCategory, setAddingCategory] = useState(false)
-  const [newCategoryName, setNewCategoryName] = useState("")
-  const [newCategoryError, setNewCategoryError] = useState<string | null>(null)
-  const [addingCategorySubmitting, setAddingCategorySubmitting] = useState(false)
+  // Sales pricing (FR-MD-01). "stock" ⇒ salePrice sent as null (sell at FIFO value);
+  // "fixed" ⇒ every variant must carry a price. `fixValue` is the shared default that
+  // pre-fills rows; a per-key entry in `pricesByKey` overrides it for that one row only.
+  const [priceMode, setPriceMode] = useState<"stock" | "fixed">("stock")
+  const [fixValue, setFixValue] = useState<string>("")
+  const [pricesByKey, setPricesByKey] = useState<Record<string, string>>({})
+  const [priceErrors, setPriceErrors] = useState<Record<string, string>>({})
 
   const [errors, setErrors] = useState<Record<string, string>>({})
   const [submitError, setSubmitError] = useState<string | null>(null)
   const [submitting, setSubmitting] = useState(false)
 
+  // A row shows its own override if set, otherwise it follows the shared fix value.
+  const priceFor = (key: string) => pricesByKey[key] ?? fixValue
+
   useEffect(() => {
     Promise.all([
       categoriesApi.list({ pageSize: 200, status: "Active" }),
       brandsApi.list({ pageSize: 200, status: "Active" }),
       itemTypesApi.list({ pageSize: 200, status: "Active" }),
       productConfig(),
-      uomsApi.list({ pageSize: 1 }),
+      uomsApi.list({ pageSize: 200 }),
+      warehousesApi.list({ pageSize: 200 }),
     ])
-      .then(([cat, br, types, cfg, uoms]) => {
+      .then(([cat, br, types, cfg, uoms, wh]) => {
         setCategories(cat.items)
         setBrands(br.items)
         setItemTypes(types.items)
         setConfig(cfg)
+        setUoms(uoms.items)
         setBaseUomId(uoms.items[0]?.uomId ?? null)
+        setWarehouses(wh.items)
       })
       .catch((err) => setLoadError(errorMessage(err)))
   }, [])
@@ -141,30 +139,8 @@ export default function NewItemPage() {
     )
   }
 
-  async function handleAddItemType() {
-    const nextErrors = validateItemTypeName(newCategoryName)
-    if (nextErrors.name) {
-      setNewCategoryError(nextErrors.name)
-      return
-    }
-    setAddingCategorySubmitting(true)
-    try {
-      const created = await itemTypesApi.create({ name: newCategoryName })
-      setItemTypes((prev) => [...(prev ?? []), created.data])
-      setCheckedItemTypeIds((prev) => [...prev, created.data.itemTypeId])
-      setNewCategoryName("")
-      setNewCategoryError(null)
-      setAddingCategory(false)
-      toast.success("Item type created", created.data.name)
-    } catch (err) {
-      setNewCategoryError(errorMessage(err))
-    } finally {
-      setAddingCategorySubmitting(false)
-    }
-  }
-
-  function addValue(itemTypeId: number, overrideValue?: string) {
-    const value = (overrideValue ?? inputByCategory[itemTypeId] ?? "").trim()
+  function addValue(itemTypeId: number) {
+    const value = (inputByCategory[itemTypeId] ?? "").trim()
     if (value) {
       setValuesByCategory((prev) => {
         const existing = prev[itemTypeId] ?? []
@@ -191,7 +167,7 @@ export default function NewItemPage() {
     [itemTypes, checkedItemTypeIds, valuesByCategory]
   )
 
-  const variants = useMemo(() => {
+  const allVariants = useMemo(() => {
     if (activeCategories.length === 0) return []
     let combinations: { key: string; parts: { name: string; value: string }[] }[] = [{ key: "", parts: [] }]
     for (const cat of activeCategories) {
@@ -208,15 +184,28 @@ export default function NewItemPage() {
     }
     return combinations.map((c) => ({
       ...c,
-      sku: buildVariantSku(effectiveLabel, c.parts.map(partLabel)),
+      sku: buildVariantSku(effectiveLabel, c.parts.map((p) => p.value)),
     }))
   }, [activeCategories, effectiveLabel])
 
+  const variants = useMemo(
+    () => allVariants.filter((v) => !removedVariantKeys.has(v.key)),
+    [allVariants, removedVariantKeys]
+  )
+
+  function removeVariant(key: string) {
+    setRemovedVariantKeys((prev) => new Set(prev).add(key))
+  }
+
   async function handleSubmit() {
     setSubmitError(null)
     const nextErrors = validateVariantItemForm({ categoryId, hasVariants: variants.length > 0 })
     setErrors(nextErrors)
-    if (Object.keys(nextErrors).length > 0) return
+    // In fixed mode, block the whole submit until every variant has a price > 0.
+    const nextPriceErrors =
+      priceMode === "fixed" ? validateVariantPrices(variants.map((v) => v.key), priceFor) : {}
+    setPriceErrors(nextPriceErrors)
+    if (Object.keys(nextErrors).length > 0 || Object.keys(nextPriceErrors).length > 0) return
     if (baseUomId === null) {
       setSubmitError("No unit of measure exists yet — create one under Products → UOM before adding items.")
       return
@@ -228,7 +217,7 @@ export default function NewItemPage() {
       for (const variant of variants) {
         await itemsApi.create({
           sku: variant.sku,
-          name: `${brandLabel ? brandLabel + " " : ""}${effectiveLabel} - ${variant.parts.map(partLabel).join("/")}`,
+          name: `${brandLabel ? brandLabel + " " : ""}${effectiveLabel} - ${variant.parts.map((p) => p.value).join("/")}`,
           // Both FKs travel: the old code sent `subCategoryId ?? categoryId` as the
           // category, which lost the parent entirely. The server rejects a mismatched
           // pair with 422.
@@ -236,8 +225,9 @@ export default function NewItemPage() {
           subCategoryId,
           brandId,
           baseUomId,
-          stockNature: "Stocked",
+          stockNature,
           trackingMode: "None",
+          salePrice: priceMode === "fixed" ? Number(priceFor(variant.key)) : null,
         })
         created += 1
       }
@@ -294,7 +284,11 @@ export default function NewItemPage() {
           <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
             <div className="flex flex-col gap-2">
               <Label className="text-base">Category</Label>
-              <Select<number | null> value={categoryId} onValueChange={handleCategoryChange}>
+              <Select<number | null>
+                value={categoryId}
+                onValueChange={handleCategoryChange}
+                items={(categories ?? []).map((c) => ({ label: c.name, value: c.categoryId }))}
+              >
                 <SelectTrigger className="h-12! w-full text-base" aria-invalid={!!errors.categoryId}>
                   <SelectValue placeholder="Select category" />
                 </SelectTrigger>
@@ -313,7 +307,12 @@ export default function NewItemPage() {
             {config?.subcategoriesEnabled && (
               <div className="flex flex-col gap-2">
                 <Label className="text-base">Subcategory (optional)</Label>
-                <Select<number | null> value={subCategoryId} onValueChange={setSubCategoryId} disabled={subCategories.length === 0}>
+                <Select<number | null>
+                  value={subCategoryId}
+                  onValueChange={setSubCategoryId}
+                  disabled={subCategories.length === 0}
+                  items={subCategories.map((s) => ({ label: s.name, value: s.subCategoryId }))}
+                >
                   <SelectTrigger className="h-12! w-full text-base">
                     <SelectValue placeholder={subCategories.length === 0 ? "No subcategories" : "Select subcategory"} />
                   </SelectTrigger>
@@ -330,7 +329,11 @@ export default function NewItemPage() {
             {config?.brandsEnabled && (
               <div className="flex flex-col gap-2">
                 <Label className="text-base">Brand (optional)</Label>
-                <Select<number | null> value={brandId} onValueChange={setBrandId}>
+                <Select<number | null>
+                  value={brandId}
+                  onValueChange={setBrandId}
+                  items={(brands ?? []).map((b) => ({ label: b.name, value: b.brandId }))}
+                >
                   <SelectTrigger className="h-12! w-full text-base">
                     <SelectValue placeholder="Select brand" />
                   </SelectTrigger>
@@ -344,6 +347,110 @@ export default function NewItemPage() {
                 </Select>
               </div>
             )}
+            <div className="flex flex-col gap-2">
+              <Label className="text-base">Warehouse (optional)</Label>
+              <Select<number | null>
+                value={warehouseId}
+                onValueChange={setWarehouseId}
+                items={warehouses.map((w) => ({ label: `${w.code} — ${w.name}`, value: w.warehouseId }))}
+              >
+                <SelectTrigger className="h-12! w-full text-base">
+                  <SelectValue placeholder="Select warehouse" />
+                </SelectTrigger>
+                <SelectContent>
+                  {warehouses.map((w) => (
+                    <SelectItem key={w.warehouseId} value={w.warehouseId} className="text-base">
+                      {w.code} — {w.name}
+                    </SelectItem>
+                  ))}
+                </SelectContent>
+              </Select>
+            </div>
+            <div className="flex flex-col gap-2">
+              <Label className="text-base">Base UOM</Label>
+              <Select<number | null>
+                value={baseUomId}
+                onValueChange={setBaseUomId}
+                items={uoms.map((u) => ({ label: u.name, value: u.uomId }))}
+              >
+                <SelectTrigger className="h-12! w-full text-base">
+                  <SelectValue placeholder="Select base UOM" />
+                </SelectTrigger>
+                <SelectContent>
+                  {uoms.map((u) => (
+                    <SelectItem key={u.uomId} value={u.uomId} className="text-base">
+                      {u.name}
+                    </SelectItem>
+                  ))}
+                </SelectContent>
+              </Select>
+            </div>
+            <div className="flex flex-col gap-2">
+              <Label className="text-base">Stock nature</Label>
+              <Select<StockNature> value={stockNature} onValueChange={(v) => v && setStockNature(v)}>
+                <SelectTrigger className="h-12! w-full text-base">
+                  <SelectValue />
+                </SelectTrigger>
+                <SelectContent>
+                  <SelectItem value="Stocked" className="text-base">Stocked</SelectItem>
+                  <SelectItem value="NonStocked" className="text-base">Non-stocked</SelectItem>
+                  <SelectItem value="Service" className="text-base">Service</SelectItem>
+                </SelectContent>
+              </Select>
+            </div>
+          </div>
+
+          {/* Sales pricing (FR-MD-01). The toggle is frontend-only: "stock" sends
+              salePrice=null (sold at FIFO value); "fixed" requires a price per variant. */}
+          <div className="flex flex-col gap-4 rounded-xl border p-5">
+            <div>
+              <h2 className="text-lg font-semibold text-foreground">Sale price</h2>
+              <p className="text-sm text-muted-foreground">
+                Choose a fixed selling price, or leave it to the item&apos;s stock value.
+              </p>
+            </div>
+
+            <div className="inline-flex w-fit rounded-lg border p-1">
+              <button
+                type="button"
+                onClick={() => setPriceMode("stock")}
+                className={cn(
+                  "rounded-md px-4 py-2 text-base font-medium transition-colors",
+                  priceMode === "stock" ? "bg-primary text-primary-foreground" : "text-muted-foreground hover:bg-muted/50",
+                )}
+              >
+                Use stock value
+              </button>
+              <button
+                type="button"
+                onClick={() => setPriceMode("fixed")}
+                className={cn(
+                  "rounded-md px-4 py-2 text-base font-medium transition-colors",
+                  priceMode === "fixed" ? "bg-primary text-primary-foreground" : "text-muted-foreground hover:bg-muted/50",
+                )}
+              >
+                Fixed price
+              </button>
+            </div>
+
+            {priceMode === "fixed" && (
+              <div className="flex max-w-xs flex-col gap-2">
+                <Label className="text-base">Fix value (applies to all variants)</Label>
+                <Input
+                  type="number"
+                  min="0"
+                  step="0.01"
+                  inputMode="decimal"
+                  value={fixValue}
+                  onChange={(e) => setFixValue(e.target.value)}
+                  placeholder="0.00"
+                  className="h-11 text-base"
+                />
+                <p className="text-sm text-muted-foreground">
+                  Edit any row below to give that variant a different price.
+                </p>
+              </div>
+            )}
           </div>
 
           {/* itemTypesEnabled is advisory — the server cannot enforce it (items hold no
@@ -358,67 +465,19 @@ export default function NewItemPage() {
             </div>
 
             <div className="flex flex-wrap items-center gap-4">
-              {(itemTypes ?? []).map((t) => (
-                <label key={t.itemTypeId} className="flex items-center gap-2.5 rounded-lg border px-3 py-2 hover:bg-muted/50">
-                  <Checkbox
-                    checked={checkedItemTypeIds.includes(t.itemTypeId)}
-                    onCheckedChange={() => toggleItemType(t.itemTypeId)}
-                  />
-                  <span className="text-base font-medium">{t.name}</span>
-                </label>
-              ))}
-              {!addingCategory && (
-                <Button
-                  type="button"
-                  variant="outline"
-                  size="icon-sm"
-                  aria-label="Add another item type"
-                  onClick={() => setAddingCategory(true)}
-                >
-                  <Plus className="size-4" />
-                </Button>
-              )}
+              {(itemTypes ?? [])
+                .filter((t) => isBuilderItemType(t.name))
+                .map((t) => (
+                  <label key={t.itemTypeId} className="flex items-center gap-2.5 rounded-lg border px-3 py-2 hover:bg-muted/50">
+                    <Checkbox
+                      checked={checkedItemTypeIds.includes(t.itemTypeId)}
+                      onCheckedChange={() => toggleItemType(t.itemTypeId)}
+                    />
+                    <span className="text-base font-medium">{t.name}</span>
+                  </label>
+                ))}
             </div>
 
-            {addingCategory && (
-              <div className="flex flex-col gap-2">
-                <div className="flex gap-2">
-                  <Input
-                    value={newCategoryName}
-                    onChange={(e) => setNewCategoryName(e.target.value)}
-                    onKeyDown={(e) => {
-                      if (e.key === "Enter") {
-                        e.preventDefault()
-                        handleAddItemType()
-                      }
-                    }}
-                    placeholder="Material"
-                    className="h-11 max-w-xs text-base"
-                    aria-invalid={!!newCategoryError}
-                    autoFocus
-                  />
-                  <Button type="button" onClick={handleAddItemType} disabled={addingCategorySubmitting}>
-                    <Plus className="size-4" />
-                    Add
-                  </Button>
-                  <Button
-                    type="button"
-                    variant="ghost"
-                    size="icon"
-                    aria-label="Cancel"
-                    onClick={() => {
-                      setAddingCategory(false)
-                      setNewCategoryName("")
-                      setNewCategoryError(null)
-                    }}
-                  >
-                    <X className="size-4" />
-                  </Button>
-                </div>
-                <FieldError errors={[newCategoryError ? { message: newCategoryError } : undefined]} />
-              </div>
-            )}
-
             <FieldError errors={[errors.variants ? { message: errors.variants } : undefined]} />
 
             {checkedItemTypeIds.length > 0 && (
@@ -426,86 +485,43 @@ export default function NewItemPage() {
                 {(itemTypes ?? [])
                   .filter((t) => checkedItemTypeIds.includes(t.itemTypeId))
                   .map((t) => {
-                    const isColor = isColorCategory(t.name)
                     const currentInput = inputByCategory[t.itemTypeId] ?? ""
-                    const currentColorName = colorNameByCategory[t.itemTypeId] ?? ""
-
-                    function addColor() {
-                      const name = currentColorName.trim()
-                      if (!name) return
-                      addValue(t.itemTypeId, encodeColorValue(name, currentInput || "#EF4444"))
-                      setColorNameByCategory((prev) => ({ ...prev, [t.itemTypeId]: "" }))
-                    }
 
                     return (
                       <div key={t.itemTypeId} className="flex flex-col gap-2">
                         <Label className="text-base">{t.name} values</Label>
                         <div className="flex gap-2">
-                          {isColor ? (
-                            <>
-                              <input
-                                type="color"
-                                value={currentInput || "#EF4444"}
-                                onChange={(e) => setInputByCategory((prev) => ({ ...prev, [t.itemTypeId]: e.target.value }))}
-                                className="h-11 w-11 shrink-0 cursor-pointer rounded-md border border-input p-0.5"
-                                aria-label="Pick color"
-                              />
-                              <Input
-                                value={currentColorName}
-                                onChange={(e) => setColorNameByCategory((prev) => ({ ...prev, [t.itemTypeId]: e.target.value }))}
-                                onKeyDown={(e) => {
-                                  if (e.key === "Enter") {
-                                    e.preventDefault()
-                                    addColor()
-                                  }
-                                }}
-                                placeholder="Color name (e.g. Red)"
-                                className="h-11 text-base"
-                              />
-                            </>
-                          ) : (
-                            <Input
-                              value={currentInput}
-                              onChange={(e) => setInputByCategory((prev) => ({ ...prev, [t.itemTypeId]: e.target.value }))}
-                              onKeyDown={(e) => {
-                                if (e.key === "Enter") {
-                                  e.preventDefault()
-                                  addValue(t.itemTypeId)
-                                }
-                              }}
-                              placeholder={t.name}
-                              className="h-11 text-base"
-                            />
-                          )}
-                          <Button type="button" variant="outline" onClick={() => (isColor ? addColor() : addValue(t.itemTypeId))}>
+                          <Input
+                            value={currentInput}
+                            onChange={(e) => setInputByCategory((prev) => ({ ...prev, [t.itemTypeId]: e.target.value }))}
+                            onKeyDown={(e) => {
+                              if (e.key === "Enter") {
+                                e.preventDefault()
+                                addValue(t.itemTypeId)
+                              }
+                            }}
+                            placeholder={t.name}
+                            className="h-11 text-base"
+                          />
+                          <Button type="button" variant="outline" onClick={() => addValue(t.itemTypeId)}>
                             <Plus className="size-4" />
                             Add {t.name}
                           </Button>
                         </div>
                         <div className="flex flex-wrap gap-2">
-                          {(valuesByCategory[t.itemTypeId] ?? []).map((v) => {
-                            const decoded = isColor ? decodeColorValue(v) : null
-                            return (
-                              <Badge key={v} variant="outline" className="h-7 gap-1 pr-1 text-sm">
-                                {decoded && (
-                                  <span
-                                    className="size-3.5 shrink-0 rounded-full border border-black/10"
-                                    style={{ backgroundColor: decoded.hex }}
-                                    aria-hidden="true"
-                                  />
-                                )}
-                                {decoded ? decoded.name : v}
-                                <button
-                                  type="button"
-                                  onClick={() => removeValue(t.itemTypeId, v)}
-                                  className="rounded-full p-0.5 hover:bg-muted"
-                                  aria-label={`Remove ${decoded ? decoded.name : v}`}
-                                >
-                                  <X className="size-3" />
-                                </button>
-                              </Badge>
-                            )
-                          })}
+                          {(valuesByCategory[t.itemTypeId] ?? []).map((v) => (
+                            <Badge key={v} variant="outline" className="h-7 gap-1 pr-1 text-sm">
+                              {v}
+                              <button
+                                type="button"
+                                onClick={() => removeValue(t.itemTypeId, v)}
+                                className="rounded-full p-0.5 hover:bg-muted"
+                                aria-label={`Remove ${v}`}
+                              >
+                                <X className="size-3" />
+                              </button>
+                            </Badge>
+                          ))}
                         </div>
                       </div>
                     )
@@ -522,33 +538,62 @@ export default function NewItemPage() {
                         <TableHead key={cat.itemTypeId} className="h-11 px-3 text-sm text-indigo-700">{cat.name}</TableHead>
                       ))}
                       <TableHead className="h-11 px-3 text-sm text-indigo-700">SKU</TableHead>
+                      {priceMode === "fixed" && (
+                        <TableHead className="h-11 px-3 text-sm text-indigo-700">Sale price</TableHead>
+                      )}
                       {/* Quantity column removed 2026-07-17: there is no `initialQty` on the
                           Item contract and no initial-receipt flow — stock arrives via a GRN.
                           The input was informational-only under the mock and would now be a
                           field that silently discards what you type. */}
+                      <TableHead className="h-11 w-8 px-1" />
                     </TableRow>
                   </TableHeader>
                   <TableBody>
                     {variants.map((variant) => (
                       <TableRow key={variant.key}>
-                        {variant.parts.map((part, i) => {
-                          const decoded = isColorCategory(part.name) ? decodeColorValue(part.value) : null
-                          return (
-                            <TableCell key={i} className="px-3 py-2.5">
-                              <span className="inline-flex items-center gap-1.5">
-                                {decoded && (
-                                  <span
-                                    className="size-3.5 shrink-0 rounded-full border border-black/10"
-                                    style={{ backgroundColor: decoded.hex }}
-                                    aria-hidden="true"
-                                  />
-                                )}
-                                {partLabel(part)}
-                              </span>
-                            </TableCell>
-                          )
-                        })}
-                        <TableCell className="px-3 py-2.5 font-medium">{variant.sku}</TableCell>
+                        {variant.parts.map((part, i) => (
+                          <TableCell key={i} className="px-3 py-2.5">
+                            {part.value}
+                          </TableCell>
+                        ))}
+                        <TableCell className="py-2.5 pr-1 pl-3 font-medium">{variant.sku}</TableCell>
+                        {priceMode === "fixed" && (
+                          <TableCell className="px-3 py-2.5">
+                            <Input
+                              type="number"
+                              min="0"
+                              step="0.01"
+                              inputMode="decimal"
+                              value={priceFor(variant.key)}
+                              onChange={(e) => {
+                                const value = e.target.value
+                                setPricesByKey((prev) => ({ ...prev, [variant.key]: value }))
+                                setPriceErrors((prev) => {
+                                  if (!prev[variant.key]) return prev
+                                  const next = { ...prev }
+                                  delete next[variant.key]
+                                  return next
+                                })
+                              }}
+                              placeholder="0.00"
+                              aria-invalid={!!priceErrors[variant.key]}
+                              className="h-10 w-28 text-base"
+                            />
+                            <FieldError errors={[priceErrors[variant.key] ? { message: priceErrors[variant.key] } : undefined]} />
+                          </TableCell>
+                        )}
+                        <TableCell className="py-2.5 pr-3 pl-0">
+                          <Button
+                            type="button"
+                            variant="ghost"
+                            size="icon-sm"
+                            onClick={() => removeVariant(variant.key)}
+                            aria-label={`Remove ${variant.sku}`}
+                            className="text-destructive hover:bg-destructive/10"
+                          >
+                            <X className="size-4" />
+                          </Button>
+                        </TableCell>
                       </TableRow>
                     ))}
                   </TableBody>

Frontend/erp-system/app/dashboard/products/page.tsx

@@ -6,10 +6,12 @@ import { ChevronLeft, ChevronRight, ListTree, Package, Pencil, Plus, Ruler, Sear
 
 import { itemsApi } from "@/lib/api/items"
 import { categoriesApi } from "@/lib/api/categories"
+import { brandsApi } from "@/lib/api/brands"
+import { productConfig } from "@/lib/api/product-config"
 import { errorMessage } from "@/lib/error-map"
 import { cn } from "@/lib/utils"
 import { EntityStatus, PaginationMeta } from "@/types/common"
-import { Category, ItemListItem, TrackingMode } from "@/types/master-data"
+import { Brand, Category, ItemListItem, ProductConfig, SubCategory, TrackingMode } from "@/types/master-data"
 
 import { Badge } from "@/components/ui/badge"
 import { Button, buttonVariants } from "@/components/ui/button"
@@ -26,6 +28,9 @@ const PAGE_SIZE = 10
 export default function ItemsPage() {
   const [items, setItems] = useState<ItemListItem[] | null>(null)
   const [categories, setCategories] = useState<Category[]>([])
+  const [subCategories, setSubCategories] = useState<SubCategory[]>([])
+  const [brands, setBrands] = useState<Brand[]>([])
+  const [config, setConfig] = useState<ProductConfig | null>(null)
   const [pagination, setPagination] = useState<PaginationMeta | null>(null)
   const [error, setError] = useState<string | null>(null)
 
@@ -64,12 +69,33 @@ export default function ItemsPage() {
   useEffect(load, [page, query, status, categoryId, trackingMode])
   useEffect(() => {
     categoriesApi.list().then((res) => setCategories(res.items)).catch(() => {})
+    brandsApi.list({ pageSize: 200 }).then((res) => setBrands(res.items)).catch(() => {})
+    productConfig().then(setConfig).catch(() => {})
   }, [])
 
+  // No "list all subcategories" endpoint exists — they're scoped per category — so once
+  // categories are in, fetch each one's subcategories in parallel to build a flat lookup.
+  useEffect(() => {
+    if (categories.length === 0) return
+    Promise.all(
+      categories.map((c) =>
+        categoriesApi.listSubCategories(c.categoryId, { pageSize: 200 }).catch(() => ({ items: [] as SubCategory[] }))
+      )
+    ).then((results) => setSubCategories(results.flatMap((r) => r.items)))
+  }, [categories])
+
   function categoryName(id: number) {
     return categories.find((c) => c.categoryId === id)?.name ?? `#${id}`
   }
 
+  function subCategoryName(id: number) {
+    return subCategories.find((s) => s.subCategoryId === id)?.name ?? `#${id}`
+  }
+
+  function brandName(id: number) {
+    return brands.find((b) => b.brandId === id)?.name ?? `#${id}`
+  }
+
   const hasFilters = query.length > 0 || status !== "All" || categoryId !== "All" || trackingMode !== "All"
 
   return (
@@ -106,7 +132,11 @@ export default function ItemsPage() {
             aria-label="Search items"
           />
         </div>
-        <Select<number | "All"> value={categoryId} onValueChange={(v) => setCategoryId(v ?? "All")}>
+        <Select<number | "All">
+          value={categoryId}
+          onValueChange={(v) => setCategoryId(v ?? "All")}
+          items={[{ label: "All categories", value: "All" as const }, ...categories.map((c) => ({ label: c.name, value: c.categoryId }))]}
+        >
           <SelectTrigger className="h-14! w-full flex-1 basis-0 text-base">
             <SelectValue placeholder="All categories" />
           </SelectTrigger>
@@ -175,6 +205,8 @@ export default function ItemsPage() {
                 <TableHead className="h-12 px-3 text-sm">SKU</TableHead>
                 <TableHead className="h-12 px-3 text-sm">Name</TableHead>
                 <TableHead className="h-12 px-3 text-sm">Category</TableHead>
+                {config?.subcategoriesEnabled && <TableHead className="h-12 px-3 text-sm">Subcategory</TableHead>}
+                {config?.brandsEnabled && <TableHead className="h-12 px-3 text-sm">Brand</TableHead>}
                 <TableHead className="h-12 px-3 text-sm">Type</TableHead>
                 <TableHead className="h-12 px-3 text-sm">Tracking</TableHead>
                 <TableHead className="h-12 px-3 text-sm">Status</TableHead>
@@ -191,6 +223,16 @@ export default function ItemsPage() {
                   </TableCell>
                   <TableCell className="px-3 py-3.5">{item.name}</TableCell>
                   <TableCell className="px-3 py-3.5">{categoryName(item.categoryId)}</TableCell>
+                  {config?.subcategoriesEnabled && (
+                    <TableCell className="px-3 py-3.5 text-muted-foreground">
+                      {item.subCategoryId !== null ? subCategoryName(item.subCategoryId) : "—"}
+                    </TableCell>
+                  )}
+                  {config?.brandsEnabled && (
+                    <TableCell className="px-3 py-3.5 text-muted-foreground">
+                      {item.brandId !== null ? brandName(item.brandId) : "—"}
+                    </TableCell>
+                  )}
                   <TableCell className="px-3 py-3.5">{item.stockNature}</TableCell>
                   <TableCell className="px-3 py-3.5">{item.trackingMode}</TableCell>
                   <TableCell className="px-3 py-3.5">

Frontend/erp-system/app/dashboard/products/settings/page.tsx

@@ -2,7 +2,7 @@
 
 import { useEffect, useState } from "react"
 import Link from "next/link"
-import { ArrowLeft, Info } from "lucide-react"
+import { ArrowLeft, Package } from "lucide-react"
 
 import { productConfigApi } from "@/lib/api/product-config"
 import { errorMessage } from "@/lib/error-map"
@@ -17,11 +17,10 @@ import { toast } from "@/components/ui/toast"
 /**
  * Product Configuration (docs/11 §2.8; FR-MD-11) — the singleton feature gate.
  *
- * Only three flags exist. `subcategoriesEnabled`/`brandsEnabled` are enforced by the
- * server (an item write carrying a gated field gets 422 CONFIG_DISABLED);
- * `itemTypesEnabled` is advisory — items hold no item-type reference, so the frontend
- * hiding the builder's type section IS the enforcement. That distinction is surfaced in
- * the UI rather than hidden, because it changes what "off" actually guarantees.
+ * `subcategoriesEnabled`/`brandsEnabled` are the only user-toggleable flags here and are
+ * enforced by the server (an item write carrying a gated field gets 422 CONFIG_DISABLED).
+ * `itemTypesEnabled` has no control on this screen but is still part of the record, so
+ * every save round-trips its current value unchanged (the server rejects a partial body).
  */
 export default function ProductSettingsPage() {
   const [config, setConfig] = useState<ProductConfig | null>(null)
@@ -42,7 +41,7 @@ export default function ProductSettingsPage() {
 
   useEffect(load, [])
 
-  async function toggle(flag: "subcategoriesEnabled" | "brandsEnabled" | "itemTypesEnabled", next: boolean) {
+  async function toggle(flag: "subcategoriesEnabled" | "brandsEnabled", next: boolean) {
     if (!config) return
     setSaving(flag)
     try {
@@ -90,32 +89,29 @@ export default function ProductSettingsPage() {
 
       {!error && config && (
         <div className="flex flex-col gap-4 rounded-xl border p-6">
-          <h2 className="text-lg font-semibold text-foreground">Product Capabilities</h2>
+          <div className="flex items-center gap-2">
+            <Package className="size-5 text-primary" />
+            <h2 className="text-lg font-semibold text-foreground">Product Capabilities</h2>
+          </div>
+          <div className="border-t" />
 
-          <ToggleRow
-            label="Subcategories"
-            description="Adds one optional level below a category. Off ⇒ items attach directly to a category."
-            checked={config.subcategoriesEnabled}
-            busy={saving === "subcategoriesEnabled"}
-            onChange={(v) => toggle("subcategoriesEnabled", v)}
-          />
+          <div className="grid grid-cols-1 gap-x-10 md:grid-cols-2">
+            <ToggleRow
+              label="Subcategories"
+              description="Category hierarchy includes a subcategory level. Off ⇒ products attach directly to a category."
+              checked={config.subcategoriesEnabled}
+              busy={saving === "subcategoriesEnabled"}
+              onChange={(v) => toggle("subcategoriesEnabled", v)}
+            />
 
-          <ToggleRow
-            label="Brands"
-            description="Items may carry a brand."
-            checked={config.brandsEnabled}
-            busy={saving === "brandsEnabled"}
-            onChange={(v) => toggle("brandsEnabled", v)}
-          />
-
-          <ToggleRow
-            label="Item types"
-            description="The item builder offers Color / Size / Material dimensions when creating items."
-            checked={config.itemTypesEnabled}
-            busy={saving === "itemTypesEnabled"}
-            onChange={(v) => toggle("itemTypesEnabled", v)}
-            note="Advisory: the app honours this, but the server cannot enforce it — items store no item-type reference. Turning it off hides the builder's section; it does not reject anything."
-          />
+            <ToggleRow
+              label="Brands"
+              description="Products may carry a brand."
+              checked={config.brandsEnabled}
+              busy={saving === "brandsEnabled"}
+              onChange={(v) => toggle("brandsEnabled", v)}
+            />
+          </div>
 
           {config.updatedAt && (
             <p className="pt-2 text-sm text-muted-foreground">
@@ -132,7 +128,6 @@ export default function ProductSettingsPage() {
 const LABELS: Record<string, string> = {
   subcategoriesEnabled: "Subcategories",
   brandsEnabled: "Brands",
-  itemTypesEnabled: "Item types",
 }
 
 function ToggleRow({
@@ -141,28 +136,26 @@ function ToggleRow({
   checked,
   busy,
   onChange,
-  note,
 }: {
   label: string
   description: string
   checked: boolean
   busy: boolean
   onChange: (next: boolean) => void
-  note?: string
 }) {
   return (
-    <div className="flex items-start justify-between gap-6 border-t py-4 first:border-t-0">
+    <div className="flex items-start gap-4 py-4">
+      <Switch
+        checked={checked}
+        onCheckedChange={onChange}
+        disabled={busy}
+        aria-label={label}
+        className="mt-1 shrink-0"
+      />
       <div className="flex flex-col gap-1">
         <span className="text-base font-medium text-foreground">{label}</span>
         <span className="text-sm text-muted-foreground">{description}</span>
-        {note && (
-          <span className="mt-1 inline-flex items-start gap-1.5 text-sm text-amber-700">
-            <Info className="mt-0.5 size-4 shrink-0" />
-            {note}
-          </span>
-        )}
       </div>
-      <Switch checked={checked} onCheckedChange={onChange} disabled={busy} aria-label={label} />
     </div>
   )
 }

Frontend/erp-system/app/dashboard/receiving/grn/[id]/page.tsx

@@ -158,6 +158,7 @@ export default function GrnDetailPage() {
         </div>
       )}
 
+      <div className="overflow-x-auto">
       <Table className="text-base">
         <TableHeader>
           <TableRow>
@@ -165,8 +166,12 @@ export default function GrnDetailPage() {
             <TableHead className="h-12 px-3 text-sm">UOM</TableHead>
             <TableHead className="h-12 px-3 text-sm">Bin</TableHead>
             <TableHead className="h-12 px-3 text-sm">Qty</TableHead>
-            <TableHead className="h-12 px-3 text-sm">Unit cost</TableHead>
-            <TableHead className="h-12 px-3 text-sm">Received value</TableHead>
+            <TableHead className="h-12 px-3 text-sm text-right">Unit cost</TableHead>
+            <TableHead className="h-12 px-3 text-sm text-right">Disc %</TableHead>
+            <TableHead className="h-12 px-3 text-sm text-right">Net cost</TableHead>
+            <TableHead className="h-12 px-3 text-sm text-right">Received value</TableHead>
+            <TableHead className="h-12 px-3 text-sm text-right">VAT</TableHead>
+            <TableHead className="h-12 px-3 text-sm text-right">Line total</TableHead>
             <TableHead className="h-12 px-3 text-sm">Hold status</TableHead>
             {grn.status === "Confirmed" && <TableHead className="h-12 px-3 text-sm">Actions</TableHead>}
           </TableRow>
@@ -180,8 +185,22 @@ export default function GrnDetailPage() {
                 <TableCell className="px-3 py-3.5">{uomFor(line.uomId)}</TableCell>
                 <TableCell className="px-3 py-3.5">{binFor(line.binId)}</TableCell>
                 <TableCell className="px-3 py-3.5">{line.qty}</TableCell>
-                <TableCell className="px-3 py-3.5">{line.unitCost.toFixed(2)}</TableCell>
-                <TableCell className="px-3 py-3.5">{line.receivedValue.toFixed(2)}</TableCell>
+                <TableCell className="px-3 py-3.5 text-right tabular-nums">
+                  {line.unitCost.toFixed(2)}
+                  {line.poUnitPrice !== null && line.priceVariance !== 0 && (
+                    <span className="block text-xs text-warning">
+                      PO {line.poUnitPrice.toFixed(2)} · var {line.priceVariance > 0 ? "+" : ""}{line.priceVariance.toFixed(2)}
+                    </span>
+                  )}
+                </TableCell>
+                <TableCell className="px-3 py-3.5 text-right tabular-nums">{line.discountPct.toFixed(2)}</TableCell>
+                <TableCell className="px-3 py-3.5 text-right tabular-nums">{line.netUnitCost.toFixed(2)}</TableCell>
+                <TableCell className="px-3 py-3.5 text-right tabular-nums">{line.receivedValue.toFixed(2)}</TableCell>
+                <TableCell className="px-3 py-3.5 text-right tabular-nums">
+                  {line.vatAmount.toFixed(2)}
+                  <span className="block text-xs text-muted-foreground">{line.vatPct.toFixed(2)}%</span>
+                </TableCell>
+                <TableCell className="px-3 py-3.5 text-right tabular-nums font-medium">{line.lineTotal.toFixed(2)}</TableCell>
                 <TableCell className="px-3 py-3.5">
                   <HoldStatusBadge status={line.holdStatus} />
                 </TableCell>
@@ -228,6 +247,22 @@ export default function GrnDetailPage() {
           })}
         </TableBody>
       </Table>
+      </div>
+
+      <div className="flex justify-end gap-8 border-t border-border pt-4 text-base">
+        <div className="flex gap-3">
+          <span className="text-muted-foreground">Stock value (excl. VAT)</span>
+          <span className="tabular-nums">{grn.lines.reduce((s, l) => s + l.receivedValue, 0).toFixed(2)}</span>
+        </div>
+        <div className="flex gap-3">
+          <span className="text-muted-foreground">VAT</span>
+          <span className="tabular-nums">{grn.lines.reduce((s, l) => s + l.vatAmount, 0).toFixed(2)}</span>
+        </div>
+        <div className="flex gap-3">
+          <span className="text-muted-foreground">Document total</span>
+          <span className="font-semibold tabular-nums">{grn.lines.reduce((s, l) => s + l.lineTotal, 0).toFixed(2)}</span>
+        </div>
+      </div>
     </div>
   )
 }

Frontend/erp-system/app/dashboard/receiving/grn/new/page.tsx

@@ -3,7 +3,7 @@
 import { useEffect, useState } from "react"
 import { useRouter } from "next/navigation"
 import Link from "next/link"
-import { ArrowLeft, Plus, Trash2 } from "lucide-react"
+import { ArrowLeft, ExternalLink, Plus, RefreshCw, Trash2 } from "lucide-react"
 
 import { grnsApi } from "@/lib/api/grns"
 import { purchaseOrdersApi } from "@/lib/api/purchase-orders"
@@ -37,12 +37,28 @@ interface DraftLine {
   binId: number | null
   qty: string
   unitCost: string
+  /** PO line price when prefilled from a PO; drives the variance hint. */
+  poUnitPrice: number | null
+  discountPct: string
+  vatPct: string
   holdStatus: HoldStatus
   batchNo: string
   expiryDate: string
   serialNumbersText: string
 }
 
+/** Mirror of the server's line arithmetic — display only (docs/20 §3, server stays authoritative). */
+function computeLine(l: DraftLine) {
+  const qty = Number(l.qty) || 0
+  const gross = Number(l.unitCost) || 0
+  const disc = Number(l.discountPct) || 0
+  const vat = Number(l.vatPct) || 0
+  const netUnitCost = gross * (1 - disc / 100)
+  const receivedValue = qty * netUnitCost
+  const vatAmount = receivedValue * (vat / 100)
+  return { netUnitCost, receivedValue, vatAmount, lineTotal: receivedValue + vatAmount }
+}
+
 let keySeq = 0
 function newKey() {
   keySeq += 1
@@ -58,6 +74,9 @@ function emptyLine(): DraftLine {
     binId: null,
     qty: "",
     unitCost: "",
+    poUnitPrice: null,
+    discountPct: "0",
+    vatPct: "0",
     holdStatus: "Available",
     batchNo: "",
     expiryDate: "",
@@ -88,6 +107,7 @@ export default function NewGrnPage() {
   const [lineErrors, setLineErrors] = useState<Record<string, Record<string, string>>>({})
   const [submitError, setSubmitError] = useState<string | null>(null)
   const [submitting, setSubmitting] = useState(false)
+  const [refreshingItems, setRefreshingItems] = useState(false)
 
   useEffect(() => {
     Promise.all([
@@ -152,6 +172,9 @@ export default function NewGrnPage() {
             binId: null,
             qty: String(l.qty - l.qtyReceived),
             unitCost: String(l.unitPrice),
+            poUnitPrice: l.unitPrice,
+            discountPct: "0",
+            vatPct: "0",
             holdStatus: "Available",
             batchNo: "",
             expiryDate: "",
@@ -166,6 +189,21 @@ export default function NewGrnPage() {
     }
   }
 
+  // Re-pull the active items list so an item created in the other tab (via "New item")
+  // becomes selectable without reloading the whole screen and losing the in-progress GRN.
+  async function refreshItems() {
+    setRefreshingItems(true)
+    try {
+      const res = await itemsApi.list({ pageSize: 200, status: "Active" })
+      setItems(res.items)
+      toast.success("Items refreshed", `${res.items.length} active item${res.items.length === 1 ? "" : "s"} loaded.`)
+    } catch (err) {
+      toast.error("Could not refresh items", errorMessage(err))
+    } finally {
+      setRefreshingItems(false)
+    }
+  }
+
   function updateLine(key: string, patch: Partial<DraftLine>) {
     setLines((prev) => prev.map((l) => (l.key === key ? { ...l, ...patch } : l)))
   }
@@ -211,6 +249,8 @@ export default function NewGrnPage() {
         uomId: line.uomId,
         qty: line.qty,
         unitCost: line.unitCost,
+        discountPct: line.discountPct,
+        vatPct: line.vatPct,
         trackingMode: itemFor(line.itemId)?.trackingMode ?? null,
         batchNo: line.batchNo,
         serialNumbersText: line.serialNumbersText,
@@ -232,6 +272,8 @@ export default function NewGrnPage() {
         binId: l.binId,
         qty: Number(l.qty),
         unitCost: Number(l.unitCost),
+        discountPct: Number(l.discountPct) || 0,
+        vatPct: Number(l.vatPct) || 0,
         holdStatus: l.holdStatus,
         batch: trackingMode === "Batch" ? { batchNo: l.batchNo.trim(), expiryDate: l.expiryDate || null } : null,
         serialNumbers: trackingMode === "Serial" ? splitSerials(l.serialNumbersText) : null,
@@ -358,29 +400,62 @@ export default function NewGrnPage() {
           )}
 
           <div className="flex flex-col gap-3">
-            <div className="flex items-center justify-between">
-              <h2 className="text-base font-semibold text-foreground">Lines</h2>
-              {mode === "direct" && (
+            <div className="flex items-center justify-between gap-3">
+              <div>
+                <h2 className="text-base font-semibold text-foreground">Lines</h2>
+                {mode === "po" && (
+                  <p className="text-sm text-muted-foreground">
+                    PO lines are prefilled. Use “Add line” to receive an item that isn’t on the PO.
+                  </p>
+                )}
+              </div>
+              <div className="flex items-center gap-2">
+                {/* Off-PO items are allowed on a PO-based GRN — the server treats a line with
+                    no poLineId as a direct receipt (docs/10 FR-GRN-01, revised). */}
                 <Button type="button" variant="outline" onClick={() => setLines((prev) => [...prev, emptyLine()])}>
                   <Plus className="size-5" />
                   Add line
                 </Button>
-              )}
+                {/* Create a brand-new item in a separate tab, then refresh to pick it up. */}
+                <Button
+                  type="button"
+                  variant="outline"
+                  onClick={() => window.open("/dashboard/products/new", "_blank", "noopener,noreferrer")}
+                >
+                  <ExternalLink className="size-5" />
+                  New item
+                </Button>
+                <Button
+                  type="button"
+                  variant="outline"
+                  size="icon"
+                  onClick={refreshItems}
+                  disabled={refreshingItems}
+                  aria-label="Refresh items"
+                  title="Refresh items"
+                >
+                  <RefreshCw className={cn("size-5", refreshingItems && "animate-spin")} />
+                </Button>
+              </div>
             </div>
 
             {poLoading && <Skeleton className="h-24 w-full" />}
 
             {!poLoading && lines.length > 0 && (
+              <div className="overflow-x-auto">
               <Table className="text-base">
                 <TableHeader>
                   <TableRow>
                     <TableHead className="h-12 w-56 px-3 text-sm">Item</TableHead>
-                    <TableHead className="h-12 w-28 px-3 text-sm">UOM</TableHead>
-                    <TableHead className="h-12 w-32 px-3 text-sm">Bin</TableHead>
-                    <TableHead className="h-12 w-24 px-3 text-sm">Qty</TableHead>
+                    <TableHead className="h-12 w-24 px-3 text-sm">UOM</TableHead>
+                    <TableHead className="h-12 w-28 px-3 text-sm">Bin</TableHead>
+                    <TableHead className="h-12 w-20 px-3 text-sm">Qty</TableHead>
                     <TableHead className="h-12 w-28 px-3 text-sm">Unit cost</TableHead>
-                    <TableHead className="h-12 w-36 px-3 text-sm">Hold status</TableHead>
-                    <TableHead className="h-12 w-48 px-3 text-sm">Batch / Serial</TableHead>
+                    <TableHead className="h-12 w-24 px-3 text-sm">Disc %</TableHead>
+                    <TableHead className="h-12 w-24 px-3 text-sm">VAT %</TableHead>
+                    <TableHead className="h-12 w-28 px-3 text-sm text-right">Line total</TableHead>
+                    <TableHead className="h-12 w-32 px-3 text-sm">Hold status</TableHead>
+                    <TableHead className="h-12 w-44 px-3 text-sm">Batch / Serial</TableHead>
                     <TableHead className="h-12 w-10 px-3" />
                   </TableRow>
                 </TableHeader>
@@ -473,6 +548,50 @@ export default function NewGrnPage() {
                             className="h-11 text-base"
                           />
                           <FieldError errors={[errors.unitCost ? { message: errors.unitCost } : undefined]} />
+                          {line.poUnitPrice !== null && Number(line.unitCost) !== line.poUnitPrice && (
+                            <p className="mt-1 text-xs text-warning">
+                              PO price {line.poUnitPrice.toFixed(2)} — variance recorded
+                            </p>
+                          )}
+                        </TableCell>
+                        <TableCell className="px-3 py-3 align-top">
+                          <Input
+                            type="number"
+                            min="0"
+                            max="100"
+                            step="any"
+                            value={line.discountPct}
+                            aria-invalid={!!errors.discountPct}
+                            onChange={(e) => updateLine(line.key, { discountPct: e.target.value })}
+                            className="h-11 text-base"
+                          />
+                          <FieldError errors={[errors.discountPct ? { message: errors.discountPct } : undefined]} />
+                        </TableCell>
+                        <TableCell className="px-3 py-3 align-top">
+                          <Input
+                            type="number"
+                            min="0"
+                            max="100"
+                            step="any"
+                            value={line.vatPct}
+                            aria-invalid={!!errors.vatPct}
+                            onChange={(e) => updateLine(line.key, { vatPct: e.target.value })}
+                            className="h-11 text-base"
+                          />
+                          <FieldError errors={[errors.vatPct ? { message: errors.vatPct } : undefined]} />
+                        </TableCell>
+                        <TableCell className="px-3 py-3 align-top text-right tabular-nums">
+                          {(() => {
+                            const c = computeLine(line)
+                            return (
+                              <div className="flex h-11 flex-col justify-center">
+                                <span>{c.lineTotal.toFixed(2)}</span>
+                                <span className="text-xs text-muted-foreground">
+                                  net {c.receivedValue.toFixed(2)} + VAT {c.vatAmount.toFixed(2)}
+                                </span>
+                              </div>
+                            )
+                          })()}
                         </TableCell>
                         <TableCell className="px-3 py-3 align-top">
                           <Select<HoldStatus>
@@ -533,6 +652,16 @@ export default function NewGrnPage() {
                   })}
                 </TableBody>
               </Table>
+              </div>
+            )}
+
+            {!poLoading && lines.length > 0 && (
+              <div className="flex justify-end gap-6 pr-12 text-base">
+                <span className="text-muted-foreground">Document total (incl. VAT)</span>
+                <span className="font-semibold tabular-nums">
+                  {lines.reduce((sum, l) => sum + computeLine(l).lineTotal, 0).toFixed(2)}
+                </span>
+              </div>
             )}
           </div>
 

Frontend/erp-system/app/dashboard/settings/roles/[id]/page.tsx

@@ -0,0 +1,222 @@
+"use client"
+
+import { useEffect, useState } from "react"
+import { useParams, useRouter } from "next/navigation"
+import Link from "next/link"
+import { AlertTriangle, ArrowLeft, Save } from "lucide-react"
+
+import { navApi } from "@/lib/api/nav"
+import { rolesApi } from "@/lib/api/roles"
+import { errorMessage, fieldErrors } from "@/lib/error-map"
+import { cn } from "@/lib/utils"
+import { NavItem, Role } from "@/types/rbac"
+
+import { RolePermissionTree } from "@/components/auth/RolePermissionTree"
+import { Button, buttonVariants } from "@/components/ui/button"
+import { Input } from "@/components/ui/input"
+import { Label } from "@/components/ui/label"
+import { FieldError } from "@/components/ui/field"
+import { Badge } from "@/components/ui/badge"
+import { Skeleton } from "@/components/ui/skeleton"
+import { toast } from "@/components/ui/toast"
+
+export default function RoleDetailPage() {
+  const params = useParams<{ id: string }>()
+  const router = useRouter()
+  const roleId = Number(params.id)
+
+  const [role, setRole] = useState<Role | null>(null)
+  const [etag, setEtag] = useState<string | null>(null)
+  const [tree, setTree] = useState<NavItem[] | null>(null)
+  const [loadError, setLoadError] = useState<string | null>(null)
+
+  const [code, setCode] = useState("")
+  const [name, setName] = useState("")
+  const [navItemIds, setNavItemIds] = useState<Set<number>>(new Set())
+  const [subNavItemIds, setSubNavItemIds] = useState<Set<number>>(new Set())
+
+  const [errors, setErrors] = useState<Record<string, string>>({})
+  const [conflict, setConflict] = useState(false)
+  const [saveError, setSaveError] = useState<string | null>(null)
+  const [saving, setSaving] = useState(false)
+  const [savingPermissions, setSavingPermissions] = useState(false)
+
+  function load() {
+    setLoadError(null)
+    Promise.all([rolesApi.get(roleId), navApi.tree(), rolesApi.getPermissions(roleId)])
+      .then(([roleResult, navTree, permissions]) => {
+        setRole(roleResult.data)
+        setEtag(roleResult.etag)
+        setCode(roleResult.data.code)
+        setName(roleResult.data.name)
+        setTree(navTree)
+        setNavItemIds(new Set(permissions.navItemIds))
+        setSubNavItemIds(new Set(permissions.subNavItemIds))
+        setConflict(false)
+      })
+      .catch((err) => setLoadError(errorMessage(err)))
+  }
+
+  useEffect(() => {
+    if (Number.isFinite(roleId)) load()
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [roleId])
+
+  async function handleSave() {
+    setSaveError(null)
+    const nextErrors: Record<string, string> = {}
+    if (!code.trim()) nextErrors.code = "Role code is required"
+    if (!name.trim()) nextErrors.name = "Role name is required"
+    setErrors(nextErrors)
+    if (Object.keys(nextErrors).length > 0 || !etag) return
+
+    setSaving(true)
+    try {
+      const result = await rolesApi.update(roleId, { code: code.trim().toUpperCase(), name: name.trim() }, etag)
+      setRole(result.data)
+      setEtag(result.etag)
+      toast.success("Role saved", `${result.data.code} — ${result.data.name}`)
+    } catch (err) {
+      const errCode = (err as { code?: string })?.code
+      if (errCode === "CONCURRENCY_CONFLICT") {
+        setConflict(true)
+        setSaveError(errorMessage(err))
+        setSaving(false)
+        return
+      }
+      const fe = fieldErrors(err)
+      if (fe?.code) setErrors({ code: fe.code })
+      setSaveError(errorMessage(err))
+      toast.error("Could not save role", errorMessage(err))
+    } finally {
+      setSaving(false)
+    }
+  }
+
+  async function handleSavePermissions() {
+    setSavingPermissions(true)
+    try {
+      await rolesApi.assignPermissions(roleId, {
+        navItemIds: Array.from(navItemIds),
+        subNavItemIds: Array.from(subNavItemIds),
+      })
+      toast.success("Permissions saved", "This role's visible sidebar sections have been updated.")
+    } catch (err) {
+      toast.error("Could not save permissions", errorMessage(err))
+    } finally {
+      setSavingPermissions(false)
+    }
+  }
+
+  if (loadError && !role) {
+    return (
+      <div className="flex flex-col gap-4">
+        <div className="rounded-lg border border-destructive/30 bg-destructive/5 p-5 text-base text-destructive">{loadError}</div>
+        <Link href="/dashboard/settings/roles" className={cn(buttonVariants({ variant: "outline" }))}>
+          Back to roles
+        </Link>
+      </div>
+    )
+  }
+
+  if (!role || !tree) {
+    return (
+      <div className="flex flex-col gap-3">
+        <Skeleton className="h-10 w-72" />
+        <Skeleton className="h-48 w-full" />
+      </div>
+    )
+  }
+
+  return (
+    <div className="flex flex-col gap-8">
+      <div className="flex items-center justify-between">
+        <div className="flex items-center gap-3">
+          <Link href="/dashboard/settings/roles" className={cn(buttonVariants({ variant: "ghost", size: "icon-lg" }))}>
+            <ArrowLeft className="size-5" />
+          </Link>
+          <div>
+            <div className="flex items-center gap-3">
+              <h1 className="text-2xl font-bold text-foreground">{role.code}</h1>
+              <Badge
+                variant="outline"
+                className={cn(
+                  "h-6 w-fit justify-center border-transparent px-2.5 text-sm",
+                  role.status === "Active" ? "bg-success/10 text-success" : "bg-muted text-muted-foreground"
+                )}
+              >
+                {role.status}
+              </Badge>
+            </div>
+            <p className="text-base text-muted-foreground">{role.name}</p>
+          </div>
+        </div>
+      </div>
+
+      {conflict && (
+        <div className="flex items-start gap-3 rounded-lg border border-warning/30 bg-warning/5 p-5 text-base text-warning">
+          <AlertTriangle className="size-5 shrink-0" />
+          <div className="flex flex-col gap-2">
+            <p>{saveError ?? "This role was changed by someone else."} Reload before retrying.</p>
+            <Button size="sm" variant="outline" onClick={load}>
+              Reload
+            </Button>
+          </div>
+        </div>
+      )}
+
+      {saveError && !conflict && (
+        <div className="rounded-lg border border-destructive/30 bg-destructive/5 p-5 text-base text-destructive">{saveError}</div>
+      )}
+
+      <section className="flex flex-col gap-4">
+        <h2 className="text-lg font-semibold text-foreground">Details</h2>
+        <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
+          <div className="flex flex-col gap-2">
+            <Label className="text-base">Code</Label>
+            <Input value={code} readOnly disabled className="h-12 text-base text-muted-foreground" />
+          </div>
+          <div className="flex flex-col gap-2">
+            <Label className="text-base">Name</Label>
+            <Input value={name} onChange={(e) => setName(e.target.value)} aria-invalid={!!errors.name} className="h-12 text-base" disabled={conflict} />
+            <FieldError errors={[errors.name ? { message: errors.name } : undefined]} />
+          </div>
+        </div>
+        <div className="flex justify-end">
+          <Button onClick={handleSave} disabled={saving || conflict}>
+            <Save className="size-4" />
+            {saving ? "Saving…" : "Save details"}
+          </Button>
+        </div>
+      </section>
+
+      <section className="flex flex-col gap-4">
+        <div>
+          <h2 className="text-lg font-semibold text-foreground">Sidebar permissions</h2>
+          <p className="text-sm text-muted-foreground">Choose which sections a user with this role can see.</p>
+        </div>
+        <RolePermissionTree
+          tree={tree}
+          selectedNavItemIds={navItemIds}
+          selectedSubNavItemIds={subNavItemIds}
+          onChange={(nav, sub) => {
+            setNavItemIds(nav)
+            setSubNavItemIds(sub)
+          }}
+        />
+        <div className="flex justify-end">
+          <Button onClick={handleSavePermissions} disabled={savingPermissions}>
+            <Save className="size-4" />
+            {savingPermissions ? "Saving…" : "Save permissions"}
+          </Button>
+        </div>
+      </section>
+
+      <div className="flex justify-end">
+        <Button variant="outline" onClick={() => router.push("/dashboard/settings/roles")}>
+          Back to roles
+        </Button>
+      </div>
+    </div>
+  )
+}

Frontend/erp-system/app/dashboard/settings/roles/page.tsx

@@ -0,0 +1,309 @@
+"use client"
+
+import { useEffect, useState } from "react"
+import Link from "next/link"
+import { Pencil, Plus, ShieldCheck, Trash2 } from "lucide-react"
+
+import { navApi } from "@/lib/api/nav"
+import { rolesApi } from "@/lib/api/roles"
+import { errorMessage } from "@/lib/error-map"
+import { cn } from "@/lib/utils"
+import { PaginationMeta } from "@/types/common"
+import { NavItem, Role } from "@/types/rbac"
+
+import { RolePermissionTree } from "@/components/auth/RolePermissionTree"
+import { AlertDialog, AlertDialogContent, AlertDialogTrigger } from "@/components/ui/alert-dialog"
+import { Button, buttonVariants } from "@/components/ui/button"
+import { Input } from "@/components/ui/input"
+import { Badge } from "@/components/ui/badge"
+import { Field, FieldError, FieldGroup, FieldLabel } from "@/components/ui/field"
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogHeader,
+  DialogTitle,
+  DialogTrigger,
+} from "@/components/ui/dialog"
+import { Skeleton } from "@/components/ui/skeleton"
+import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from "@/components/ui/table"
+import { toast } from "@/components/ui/toast"
+
+const PAGE_SIZE = 10
+
+/** Code is derived from Name, never typed directly (e.g. "Store Manager" -> "STORE_MANAGER"). */
+function deriveCode(name: string): string {
+  return name
+    .trim()
+    .toUpperCase()
+    .replace(/[^A-Z0-9]+/g, "_")
+    .replace(/^_+|_+$/g, "")
+}
+
+export default function RolesPage() {
+  const [roles, setRoles] = useState<Role[] | null>(null)
+  const [pagination, setPagination] = useState<PaginationMeta | null>(null)
+  const [error, setError] = useState<string | null>(null)
+  const [page, setPage] = useState(1)
+
+  const [tree, setTree] = useState<NavItem[] | null>(null)
+
+  const [open, setOpen] = useState(false)
+  const [name, setName] = useState("")
+  const [navItemIds, setNavItemIds] = useState<Set<number>>(new Set())
+  const [subNavItemIds, setSubNavItemIds] = useState<Set<number>>(new Set())
+  const [errors, setErrors] = useState<Record<string, string>>({})
+  const [submitting, setSubmitting] = useState(false)
+  const [actionPendingId, setActionPendingId] = useState<number | null>(null)
+
+  function load() {
+    rolesApi
+      .list({ page, pageSize: PAGE_SIZE })
+      .then((res) => {
+        setRoles(res.items)
+        setPagination(res.pagination)
+      })
+      .catch((err) => setError(errorMessage(err)))
+  }
+
+  useEffect(load, [page])
+
+  useEffect(() => {
+    navApi.tree().then(setTree).catch(() => setTree([]))
+  }, [])
+
+  function resetForm() {
+    setName("")
+    setNavItemIds(new Set())
+    setSubNavItemIds(new Set())
+    setErrors({})
+  }
+
+  const code = deriveCode(name)
+
+  async function handleCreate() {
+    const nextErrors: Record<string, string> = {}
+    if (!name.trim()) nextErrors.name = "Role name is required"
+    else if (!code) nextErrors.name = "Role name must contain at least one letter or number"
+    setErrors(nextErrors)
+    if (Object.keys(nextErrors).length > 0) return
+
+    setSubmitting(true)
+    try {
+      const result = await rolesApi.create({ code, name: name.trim() })
+      if (navItemIds.size > 0 || subNavItemIds.size > 0) {
+        await rolesApi.assignPermissions(result.data.roleId, {
+          navItemIds: Array.from(navItemIds),
+          subNavItemIds: Array.from(subNavItemIds),
+        })
+      }
+      toast.success("Role created", `${result.data.code} — ${result.data.name}`)
+      setOpen(false)
+      resetForm()
+      load()
+    } catch (err) {
+      toast.error("Could not create role", errorMessage(err))
+    } finally {
+      setSubmitting(false)
+    }
+  }
+
+  async function handleDelete(role: Role) {
+    setActionPendingId(role.roleId)
+    try {
+      await rolesApi.remove(role.roleId)
+      toast.success("Role deleted", `${role.code} has been removed.`)
+      load()
+    } catch (err) {
+      toast.error("Could not delete role", errorMessage(err))
+    } finally {
+      setActionPendingId(null)
+    }
+  }
+
+  return (
+    <div className="flex flex-col gap-6">
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-2xl font-bold text-foreground">Roles</h1>
+          <p className="text-base text-muted-foreground">
+            Manage roles and which sidebar sections each one can see.
+          </p>
+        </div>
+
+        <Dialog
+          open={open}
+          onOpenChange={(v) => {
+            setOpen(v)
+            if (!v) resetForm()
+          }}
+        >
+          <DialogTrigger
+            render={
+              <Button size="lg">
+                <Plus className="size-5" />
+                New Role
+              </Button>
+            }
+          />
+          <DialogContent className="sm:max-w-lg">
+            <DialogHeader className="items-center text-center">
+              <DialogTitle>New role</DialogTitle>
+              <DialogDescription>Created in both the auth service and here.</DialogDescription>
+            </DialogHeader>
+            <FieldGroup>
+              <Field data-invalid={!!errors.name}>
+                <FieldLabel htmlFor="r-name">Name</FieldLabel>
+                <Input id="r-name" value={name} onChange={(e) => setName(e.target.value)} placeholder="Manager" aria-invalid={!!errors.name} />
+                <FieldError errors={[errors.name ? { message: errors.name } : undefined]} />
+              </Field>
+              <Field>
+                <FieldLabel htmlFor="r-code">Code (auto-generated)</FieldLabel>
+                <Input id="r-code" value={code} disabled readOnly placeholder="—" className="text-muted-foreground" />
+              </Field>
+            </FieldGroup>
+
+            <div className="flex flex-col gap-2">
+              <FieldLabel>Sidebar permissions</FieldLabel>
+              {tree === null ? (
+                <Skeleton className="h-32 w-full" />
+              ) : (
+                <div className="max-h-80 overflow-auto">
+                  <RolePermissionTree
+                    tree={tree}
+                    selectedNavItemIds={navItemIds}
+                    selectedSubNavItemIds={subNavItemIds}
+                    onChange={(nav, sub) => {
+                      setNavItemIds(nav)
+                      setSubNavItemIds(sub)
+                    }}
+                  />
+                </div>
+              )}
+            </div>
+
+            <div className="flex justify-center gap-3 pt-2">
+              <Button variant="outline" className="min-w-36" onClick={() => setOpen(false)} disabled={submitting}>
+                Cancel
+              </Button>
+              <Button className="min-w-36" onClick={handleCreate} disabled={submitting}>
+                {submitting ? "Creating…" : "Create"}
+              </Button>
+            </div>
+          </DialogContent>
+        </Dialog>
+      </div>
+
+      {error && (
+        <div className="rounded-lg border border-destructive/30 bg-destructive/5 p-5 text-base text-destructive">{error}</div>
+      )}
+
+      {!error && roles === null && (
+        <div className="flex flex-col gap-3">
+          {Array.from({ length: 4 }).map((_, i) => (
+            <Skeleton key={i} className="h-14 w-full" />
+          ))}
+        </div>
+      )}
+
+      {!error && roles !== null && roles.length === 0 && (
+        <div className="flex flex-col items-center gap-4 rounded-xl border border-dashed py-20 text-center">
+          <ShieldCheck className="size-12 text-muted-foreground" />
+          <p className="text-base text-muted-foreground">No roles yet.</p>
+        </div>
+      )}
+
+      {!error && roles !== null && roles.length > 0 && (
+        <Table className="text-base">
+          <TableHeader>
+            <TableRow>
+              <TableHead className="h-12 px-3 text-sm">Code</TableHead>
+              <TableHead className="h-12 px-3 text-sm">Name</TableHead>
+              <TableHead className="h-12 px-3 text-sm">Status</TableHead>
+              <TableHead className="h-12 px-3 text-sm">Actions</TableHead>
+            </TableRow>
+          </TableHeader>
+          <TableBody>
+            {roles.map((r) => (
+              <TableRow key={r.roleId}>
+                <TableCell className="px-3 py-3.5 font-medium">{r.code}</TableCell>
+                <TableCell className="px-3 py-3.5">{r.name}</TableCell>
+                <TableCell className="px-3 py-3.5">
+                  <Badge
+                    variant="outline"
+                    className={cn(
+                      "h-6 w-fit justify-center border-transparent px-2.5 text-sm",
+                      r.status === "Active" ? "bg-success/10 text-success" : "bg-muted text-muted-foreground"
+                    )}
+                  >
+                    {r.status}
+                  </Badge>
+                </TableCell>
+                <TableCell className="px-3 py-3.5">
+                  <div className="flex items-center gap-1">
+                    <Link
+                      href={`/dashboard/settings/roles/${r.roleId}`}
+                      className={cn(buttonVariants({ variant: "ghost", size: "icon-sm" }))}
+                      aria-label={`Edit ${r.code}`}
+                    >
+                      <Pencil className="size-4" />
+                    </Link>
+
+                    <AlertDialog>
+                      <AlertDialogTrigger
+                        render={
+                          <Button
+                            variant="ghost"
+                            size="icon-sm"
+                            className="text-destructive hover:bg-destructive/10"
+                            aria-label={`Delete ${r.code}`}
+                            disabled={r.isSystemRole || actionPendingId === r.roleId}
+                          />
+                        }
+                      >
+                        <Trash2 className="size-4" />
+                      </AlertDialogTrigger>
+                      <AlertDialogContent
+                        variant="destructive"
+                        title={`Delete ${r.code}?`}
+                        description={`This removes the role from both the auth service and here. Blocked if any user still holds it.`}
+                        confirmLabel="Delete"
+                        onConfirm={() => handleDelete(r)}
+                      />
+                    </AlertDialog>
+                  </div>
+                </TableCell>
+              </TableRow>
+            ))}
+          </TableBody>
+        </Table>
+      )}
+
+      {pagination && pagination.totalPages > 1 && (
+        <div className="flex items-center justify-between">
+          <p className="text-sm text-muted-foreground">
+            Showing {(pagination.page - 1) * pagination.pageSize + 1}–
+            {Math.min(pagination.page * pagination.pageSize, pagination.totalItems)} of {pagination.totalItems}
+          </p>
+          <div className="flex items-center gap-2">
+            <Button type="button" variant="outline" size="sm" disabled={pagination.page <= 1} onClick={() => setPage((p) => Math.max(1, p - 1))}>
+              Previous
+            </Button>
+            <span className="text-sm text-muted-foreground">
+              Page {pagination.page} of {pagination.totalPages}
+            </span>
+            <Button
+              type="button"
+              variant="outline"
+              size="sm"
+              disabled={pagination.page >= pagination.totalPages}
+              onClick={() => setPage((p) => Math.min(pagination.totalPages, p + 1))}
+            >
+              Next
+            </Button>
+          </div>
+        </div>
+      )}
+    </div>
+  )
+}

Frontend/erp-system/app/dashboard/settings/users/[id]/page.tsx

@@ -0,0 +1,133 @@
+"use client"
+
+import { useEffect, useState } from "react"
+import { useParams, useRouter } from "next/navigation"
+import Link from "next/link"
+import { ArrowLeft, Save } from "lucide-react"
+
+import { rolesApi } from "@/lib/api/roles"
+import { usersApi } from "@/lib/api/users"
+import { errorMessage } from "@/lib/error-map"
+import { cn } from "@/lib/utils"
+import { Role } from "@/types/rbac"
+import { ManagedUser } from "@/types/users"
+
+import { Badge } from "@/components/ui/badge"
+import { Button, buttonVariants } from "@/components/ui/button"
+import { Label } from "@/components/ui/label"
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select"
+import { Skeleton } from "@/components/ui/skeleton"
+import { toast } from "@/components/ui/toast"
+
+export default function UserDetailPage() {
+  const params = useParams<{ id: string }>()
+  const router = useRouter()
+  const userId = Number(params.id)
+
+  const [user, setUser] = useState<ManagedUser | null>(null)
+  const [roles, setRoles] = useState<Role[]>([])
+  const [loadError, setLoadError] = useState<string | null>(null)
+  const [roleId, setRoleId] = useState<string>("")
+  const [saving, setSaving] = useState(false)
+
+  function load() {
+    setLoadError(null)
+    Promise.all([usersApi.get(userId), rolesApi.list({ pageSize: 200, status: "Active" })])
+      .then(([u, roleList]) => {
+        setUser(u)
+        setRoles(roleList.items)
+        setRoleId(u.roleId ? String(u.roleId) : "")
+      })
+      .catch((err) => setLoadError(errorMessage(err)))
+  }
+
+  useEffect(() => {
+    if (Number.isFinite(userId)) load()
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [userId])
+
+  async function handleSave() {
+    if (!roleId) return
+    setSaving(true)
+    try {
+      const result = await usersApi.updateRole(userId, { roleId: Number(roleId) })
+      setUser(result)
+      toast.success("Role updated", `${result.username} is now assigned to ${result.roleName}.`)
+    } catch (err) {
+      toast.error("Could not update role", errorMessage(err))
+    } finally {
+      setSaving(false)
+    }
+  }
+
+  if (loadError && !user) {
+    return (
+      <div className="flex flex-col gap-4">
+        <div className="rounded-lg border border-destructive/30 bg-destructive/5 p-5 text-base text-destructive">{loadError}</div>
+        <Link href="/dashboard/settings/users" className={cn(buttonVariants({ variant: "outline" }))}>
+          Back to users
+        </Link>
+      </div>
+    )
+  }
+
+  if (!user) {
+    return (
+      <div className="flex flex-col gap-3">
+        <Skeleton className="h-10 w-72" />
+        <Skeleton className="h-48 w-full" />
+      </div>
+    )
+  }
+
+  return (
+    <div className="flex flex-col gap-6">
+      <div className="flex items-center gap-3">
+        <Link href="/dashboard/settings/users" className={cn(buttonVariants({ variant: "ghost", size: "icon-lg" }))}>
+          <ArrowLeft className="size-5" />
+        </Link>
+        <div>
+          <div className="flex items-center gap-3">
+            <h1 className="text-2xl font-bold text-foreground">{user.username}</h1>
+            <Badge
+              variant="outline"
+              className={cn(
+                "h-6 w-fit justify-center border-transparent px-2.5 text-sm",
+                user.status === "Active" ? "bg-success/10 text-success" : "bg-muted text-muted-foreground"
+              )}
+            >
+              {user.status}
+            </Badge>
+          </div>
+          <p className="text-base text-muted-foreground">{user.displayName}</p>
+        </div>
+      </div>
+
+      <div className="flex flex-col gap-2 sm:max-w-sm">
+        <Label className="text-base">Role</Label>
+        <Select value={roleId || undefined} onValueChange={(v) => setRoleId(v ?? "")}>
+          <SelectTrigger>
+            <SelectValue placeholder="Select a role" />
+          </SelectTrigger>
+          <SelectContent>
+            {roles.map((r) => (
+              <SelectItem key={r.roleId} value={String(r.roleId)}>
+                {r.name}
+              </SelectItem>
+            ))}
+          </SelectContent>
+        </Select>
+      </div>
+
+      <div className="flex justify-end gap-3">
+        <Button variant="outline" size="lg" onClick={() => router.push("/dashboard/settings/users")}>
+          Cancel
+        </Button>
+        <Button size="lg" onClick={handleSave} disabled={saving || !roleId}>
+          <Save className="size-5" />
+          {saving ? "Saving…" : "Save role"}
+        </Button>
+      </div>
+    </div>
+  )
+}

Frontend/erp-system/app/dashboard/settings/users/page.tsx

@@ -0,0 +1,309 @@
+"use client"
+
+import { useEffect, useState } from "react"
+import Link from "next/link"
+import { Pencil, Plus, Users as UsersIcon } from "lucide-react"
+
+import { rolesApi } from "@/lib/api/roles"
+import { usersApi } from "@/lib/api/users"
+import { errorMessage, fieldErrors } from "@/lib/error-map"
+import { cn } from "@/lib/utils"
+import { PaginationMeta } from "@/types/common"
+import { Role } from "@/types/rbac"
+import { ManagedUser, UserTypeOption } from "@/types/users"
+
+import { Button, buttonVariants } from "@/components/ui/button"
+import { Input } from "@/components/ui/input"
+import { Badge } from "@/components/ui/badge"
+import { Field, FieldError, FieldGroup, FieldLabel } from "@/components/ui/field"
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogHeader,
+  DialogTitle,
+  DialogTrigger,
+} from "@/components/ui/dialog"
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select"
+import { Skeleton } from "@/components/ui/skeleton"
+import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from "@/components/ui/table"
+import { toast } from "@/components/ui/toast"
+
+const PAGE_SIZE = 10
+
+export default function UsersPage() {
+  const [users, setUsers] = useState<ManagedUser[] | null>(null)
+  const [pagination, setPagination] = useState<PaginationMeta | null>(null)
+  const [roles, setRoles] = useState<Role[]>([])
+  const [userTypes, setUserTypes] = useState<UserTypeOption[]>([])
+  const [error, setError] = useState<string | null>(null)
+  const [page, setPage] = useState(1)
+
+  const [open, setOpen] = useState(false)
+  const [username, setUsername] = useState("")
+  const [fullName, setFullName] = useState("")
+  const [email, setEmail] = useState("")
+  const [mobileNumber, setMobileNumber] = useState("")
+  const [nic, setNic] = useState("")
+  const [roleId, setRoleId] = useState<string>("")
+  const [userTypeId, setUserTypeId] = useState("")
+  const [errors, setErrors] = useState<Record<string, string>>({})
+  const [submitting, setSubmitting] = useState(false)
+
+  function load() {
+    usersApi
+      .list({ page, pageSize: PAGE_SIZE })
+      .then((res) => {
+        setUsers(res.items)
+        setPagination(res.pagination)
+      })
+      .catch((err) => setError(errorMessage(err)))
+  }
+
+  useEffect(load, [page])
+
+  useEffect(() => {
+    rolesApi.list({ pageSize: 200, status: "Active" }).then((res) => setRoles(res.items)).catch(() => setRoles([]))
+  }, [])
+
+  useEffect(() => {
+    usersApi
+      .userTypes()
+      .then((types) => {
+        setUserTypes(types)
+        // Only one user type exists today (AuthHex's "Admin"/"dev" seed) — default to it
+        // so the admin never has to pick a raw GUID; the select still lets them switch
+        // if more types are added later.
+        if (types.length > 0) setUserTypeId((current) => current || types[0].userTypeId)
+      })
+      .catch(() => setUserTypes([]))
+  }, [])
+
+  function resetForm() {
+    setUsername("")
+    setFullName("")
+    setEmail("")
+    setMobileNumber("")
+    setNic("")
+    setRoleId("")
+    setUserTypeId("")
+    setErrors({})
+  }
+
+  async function handleCreate() {
+    const nextErrors: Record<string, string> = {}
+    if (!username.trim()) nextErrors.username = "Username is required"
+    if (!fullName.trim()) nextErrors.fullName = "Full name is required"
+    if (!email.trim()) nextErrors.email = "Email is required"
+    if (!roleId) nextErrors.roleId = "Role is required"
+    if (!userTypeId.trim()) nextErrors.userTypeId = "User type is required"
+    setErrors(nextErrors)
+    if (Object.keys(nextErrors).length > 0) return
+
+    setSubmitting(true)
+    try {
+      const result = await usersApi.create({
+        username: username.trim(),
+        fullName: fullName.trim(),
+        email: email.trim(),
+        mobileNumber: mobileNumber || null,
+        nic: nic || null,
+        roleId: Number(roleId),
+        userTypeId: userTypeId.trim(),
+      })
+      toast.success("User created", `Credentials have been emailed to ${result.username}.`)
+      setOpen(false)
+      resetForm()
+      load()
+    } catch (err) {
+      const fe = fieldErrors(err)
+      if (fe) setErrors(fe)
+      toast.error("Could not create user", errorMessage(err))
+    } finally {
+      setSubmitting(false)
+    }
+  }
+
+  return (
+    <div className="flex flex-col gap-6">
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-2xl font-bold text-foreground">Users</h1>
+          <p className="text-base text-muted-foreground">
+            Create accounts and assign roles. New users receive their credentials by email.
+          </p>
+        </div>
+
+        <Dialog open={open} onOpenChange={setOpen}>
+          <DialogTrigger
+            render={
+              <Button size="lg">
+                <Plus className="size-5" />
+                New User
+              </Button>
+            }
+          />
+          <DialogContent className="sm:max-w-md">
+            <DialogHeader className="items-center text-center">
+              <DialogTitle>New user</DialogTitle>
+              <DialogDescription>Created in both the auth service and here; password is emailed.</DialogDescription>
+            </DialogHeader>
+            <FieldGroup>
+              <Field data-invalid={!!errors.username}>
+                <FieldLabel htmlFor="u-username">Username</FieldLabel>
+                <Input id="u-username" value={username} onChange={(e) => setUsername(e.target.value)} aria-invalid={!!errors.username} />
+                <FieldError errors={[errors.username ? { message: errors.username } : undefined]} />
+              </Field>
+              <Field data-invalid={!!errors.fullName}>
+                <FieldLabel htmlFor="u-fullname">Full name</FieldLabel>
+                <Input id="u-fullname" value={fullName} onChange={(e) => setFullName(e.target.value)} aria-invalid={!!errors.fullName} />
+                <FieldError errors={[errors.fullName ? { message: errors.fullName } : undefined]} />
+              </Field>
+              <Field data-invalid={!!errors.email}>
+                <FieldLabel htmlFor="u-email">Email</FieldLabel>
+                <Input id="u-email" type="email" value={email} onChange={(e) => setEmail(e.target.value)} aria-invalid={!!errors.email} />
+                <FieldError errors={[errors.email ? { message: errors.email } : undefined]} />
+              </Field>
+              <Field>
+                <FieldLabel htmlFor="u-mobile">Mobile number (optional)</FieldLabel>
+                <Input id="u-mobile" value={mobileNumber} onChange={(e) => setMobileNumber(e.target.value)} />
+              </Field>
+              <Field>
+                <FieldLabel htmlFor="u-nic">NIC (optional)</FieldLabel>
+                <Input id="u-nic" value={nic} onChange={(e) => setNic(e.target.value)} />
+              </Field>
+              <Field data-invalid={!!errors.roleId}>
+                <FieldLabel htmlFor="u-role">Role</FieldLabel>
+                <Select value={roleId || undefined} onValueChange={(v) => setRoleId(v ?? "")}>
+                  <SelectTrigger id="u-role">
+                    <SelectValue placeholder="Select a role" />
+                  </SelectTrigger>
+                  <SelectContent>
+                    {roles.map((r) => (
+                      <SelectItem key={r.roleId} value={String(r.roleId)}>
+                        {r.name}
+                      </SelectItem>
+                    ))}
+                  </SelectContent>
+                </Select>
+                <FieldError errors={[errors.roleId ? { message: errors.roleId } : undefined]} />
+              </Field>
+              <Field data-invalid={!!errors.userTypeId}>
+                <FieldLabel htmlFor="u-usertype">User type</FieldLabel>
+                <Select value={userTypeId || undefined} onValueChange={(v) => setUserTypeId(v ?? "")}>
+                  <SelectTrigger id="u-usertype">
+                    <SelectValue placeholder="Select a user type" />
+                  </SelectTrigger>
+                  <SelectContent>
+                    {userTypes.map((t) => (
+                      <SelectItem key={t.userTypeId} value={t.userTypeId}>
+                        {t.code ?? t.userTypeId}
+                      </SelectItem>
+                    ))}
+                  </SelectContent>
+                </Select>
+                <FieldError errors={[errors.userTypeId ? { message: errors.userTypeId } : undefined]} />
+              </Field>
+            </FieldGroup>
+            <div className="flex justify-center gap-3 pt-2">
+              <Button variant="outline" className="min-w-36" onClick={() => setOpen(false)} disabled={submitting}>
+                Cancel
+              </Button>
+              <Button className="min-w-36" onClick={handleCreate} disabled={submitting}>
+                {submitting ? "Creating…" : "Create"}
+              </Button>
+            </div>
+          </DialogContent>
+        </Dialog>
+      </div>
+
+      {error && (
+        <div className="rounded-lg border border-destructive/30 bg-destructive/5 p-5 text-base text-destructive">{error}</div>
+      )}
+
+      {!error && users === null && (
+        <div className="flex flex-col gap-3">
+          {Array.from({ length: 4 }).map((_, i) => (
+            <Skeleton key={i} className="h-14 w-full" />
+          ))}
+        </div>
+      )}
+
+      {!error && users !== null && users.length === 0 && (
+        <div className="flex flex-col items-center gap-4 rounded-xl border border-dashed py-20 text-center">
+          <UsersIcon className="size-12 text-muted-foreground" />
+          <p className="text-base text-muted-foreground">No users yet.</p>
+        </div>
+      )}
+
+      {!error && users !== null && users.length > 0 && (
+        <Table className="text-base">
+          <TableHeader>
+            <TableRow>
+              <TableHead className="h-12 px-3 text-sm">Username</TableHead>
+              <TableHead className="h-12 px-3 text-sm">Display name</TableHead>
+              <TableHead className="h-12 px-3 text-sm">Role</TableHead>
+              <TableHead className="h-12 px-3 text-sm">Status</TableHead>
+              <TableHead className="h-12 px-3 text-sm">Actions</TableHead>
+            </TableRow>
+          </TableHeader>
+          <TableBody>
+            {users.map((u) => (
+              <TableRow key={u.userId}>
+                <TableCell className="px-3 py-3.5 font-medium">{u.username}</TableCell>
+                <TableCell className="px-3 py-3.5">{u.displayName}</TableCell>
+                <TableCell className="px-3 py-3.5">{u.roleName ?? "—"}</TableCell>
+                <TableCell className="px-3 py-3.5">
+                  <Badge
+                    variant="outline"
+                    className={cn(
+                      "h-6 w-fit justify-center border-transparent px-2.5 text-sm",
+                      u.status === "Active" ? "bg-success/10 text-success" : "bg-muted text-muted-foreground"
+                    )}
+                  >
+                    {u.status}
+                  </Badge>
+                </TableCell>
+                <TableCell className="px-3 py-3.5">
+                  <Link
+                    href={`/dashboard/settings/users/${u.userId}`}
+                    className={cn(buttonVariants({ variant: "ghost", size: "icon-sm" }))}
+                    aria-label={`Edit ${u.username}`}
+                  >
+                    <Pencil className="size-4" />
+                  </Link>
+                </TableCell>
+              </TableRow>
+            ))}
+          </TableBody>
+        </Table>
+      )}
+
+      {pagination && pagination.totalPages > 1 && (
+        <div className="flex items-center justify-between">
+          <p className="text-sm text-muted-foreground">
+            Showing {(pagination.page - 1) * pagination.pageSize + 1}–
+            {Math.min(pagination.page * pagination.pageSize, pagination.totalItems)} of {pagination.totalItems}
+          </p>
+          <div className="flex items-center gap-2">
+            <Button type="button" variant="outline" size="sm" disabled={pagination.page <= 1} onClick={() => setPage((p) => Math.max(1, p - 1))}>
+              Previous
+            </Button>
+            <span className="text-sm text-muted-foreground">
+              Page {pagination.page} of {pagination.totalPages}
+            </span>
+            <Button
+              type="button"
+              variant="outline"
+              size="sm"
+              disabled={pagination.page >= pagination.totalPages}
+              onClick={() => setPage((p) => Math.min(pagination.totalPages, p + 1))}
+            >
+              Next
+            </Button>
+          </div>
+        </div>
+      )}
+    </div>
+  )
+}

Frontend/erp-system/app/login/page.tsx

@@ -1,6 +1,6 @@
 "use client"
 
-import { useState } from "react"
+import { Suspense, useState } from "react"
 import Image from "next/image"
 import Link from "next/link"
 import { useRouter, useSearchParams } from "next/navigation"
@@ -41,6 +41,14 @@ function GoogleIcon() {
 }
 
 export default function LoginPage() {
+  return (
+    <Suspense fallback={null}>
+      <LoginForm />
+    </Suspense>
+  )
+}
+
+function LoginForm() {
   const router = useRouter()
   const searchParams = useSearchParams()
   const [showPassword, setShowPassword] = useState(false)

Frontend/erp-system/components/Layouts/AppSidebar.tsx

@@ -8,83 +8,133 @@ import {
   Building2,
   ChevronRight,
   ClipboardList,
+  FileText,
   HelpCircle,
   LayoutGrid,
   ListTree,
   Menu,
   Package,
   PackageCheck,
+  PackageX,
   Ruler,
   Settings,
+  ShieldCheck,
   ShoppingCart,
   SlidersHorizontal,
-  SwatchBook,
   Tag,
   Truck,
+  Users,
   Warehouse,
   X,
   type LucideIcon,
 } from "lucide-react"
 
 import { cn } from "@/lib/utils"
+import { useAuth } from "@/components/auth/AuthProvider"
 
+// `code` must match the seeded NavItem/SubNavItem codes in ERPCore
+// (Infra/Persistence/Configurations/NavItemConfiguration.cs / SubNavItemConfiguration.cs)
+// so role-based filtering (via GET /auth/me's navCodes) can match entries here.
 const navItems: {
   title: string
+  code: string
   href: string
   icon: LucideIcon
   chevron?: boolean
-  children?: { title: string; href: string; icon: LucideIcon }[]
+  children?: { title: string; code: string; href: string; icon: LucideIcon }[]
 }[] = [
-  { title: "Dashboard", href: "/dashboard", icon: LayoutGrid },
+  { title: "Dashboard", code: "dashboard", href: "/dashboard", icon: LayoutGrid },
   {
     title: "Products",
+    code: "products",
     href: "/dashboard/products",
     icon: Package,
     chevron: true,
     children: [
-      { title: "Item", href: "/dashboard/products", icon: Boxes },
-      { title: "Category", href: "/dashboard/products/categories", icon: ListTree },
-      { title: "Brand", href: "/dashboard/products/brands", icon: Tag },
-      { title: "Item Type", href: "/dashboard/products/item-types", icon: SwatchBook },
-      { title: "UOM", href: "/dashboard/products/uoms", icon: Ruler },
-      { title: "Configuration", href: "/dashboard/products/settings", icon: SlidersHorizontal },
+      { title: "Item", code: "products.item", href: "/dashboard/products", icon: Boxes },
+      { title: "Category", code: "products.category", href: "/dashboard/products/categories", icon: ListTree },
+      { title: "Brand", code: "products.brand", href: "/dashboard/products/brands", icon: Tag },
+      { title: "UOM", code: "products.uom", href: "/dashboard/products/uoms", icon: Ruler },
     ],
   },
-  { title: "Vendors", href: "/dashboard/vendors", icon: Truck, chevron: true },
-  { title: "Procurement", href: "/dashboard/procurement", icon: ClipboardList, chevron: true },
-  { title: "Receiving", href: "/dashboard/receiving/grn", icon: PackageCheck, chevron: true },
-  { title: "Stock", href: "/dashboard/stock", icon: Warehouse, chevron: true },
-  { title: "Warehouses", href: "/dashboard/warehouse", icon: Building2, chevron: true },
-  { title: "Orders", href: "/dashboard/orders", icon: ShoppingCart, chevron: true },
-  { title: "Settings", href: "/dashboard/settings", icon: Settings, chevron: true },
-  { title: "Help", href: "/dashboard/help", icon: HelpCircle },
+  { title: "Vendors", code: "vendors", href: "/dashboard/vendors", icon: Truck, chevron: true },
+  {
+    title: "Procurement",
+    code: "procurement",
+    href: "/dashboard/procurement",
+    icon: ClipboardList,
+    chevron: true,
+    children: [
+      { title: "Requisitions", code: "procurement.requisitions", href: "/dashboard/procurement/requisitions", icon: ClipboardList },
+      { title: "RFQs", code: "procurement.rfqs", href: "/dashboard/procurement/rfqs", icon: FileText },
+      { title: "Purchase Orders", code: "procurement.purchase-orders", href: "/dashboard/procurement/purchase-orders", icon: ShoppingCart },
+      { title: "Purchase Returns", code: "procurement.purchase-returns", href: "/dashboard/procurement/purchase-returns", icon: PackageX },
+    ],
+  },
+  { title: "Receiving", code: "receiving", href: "/dashboard/receiving/grn", icon: PackageCheck, chevron: true },
+  { title: "Stock", code: "stock", href: "/dashboard/stock", icon: Warehouse, chevron: true },
+  { title: "Warehouses", code: "warehouses", href: "/dashboard/warehouse", icon: Building2, chevron: true },
+  { title: "Orders", code: "orders", href: "/dashboard/orders", icon: ShoppingCart, chevron: true },
+  {
+    title: "Settings",
+    code: "settings",
+    href: "/dashboard/settings",
+    icon: Settings,
+    chevron: true,
+    children: [
+      { title: "Roles", code: "settings.roles", href: "/dashboard/settings/roles", icon: ShieldCheck },
+      { title: "Users", code: "settings.users", href: "/dashboard/settings/users", icon: Users },
+      { title: "Configuration", code: "products.configuration", href: "/dashboard/products/settings", icon: SlidersHorizontal },
+    ],
+  },
+  { title: "Help", code: "help", href: "/dashboard/help", icon: HelpCircle },
 ]
 
 function SidebarContent({
+  items,
   collapsed,
   onCollapse,
   onClose,
   pathname,
   isMobile,
 }: {
+  items: typeof navItems
   collapsed: boolean
   onCollapse: () => void
   onClose?: () => void
   pathname: string
   isMobile: boolean
 }) {
+  const iconOnly = !isMobile && collapsed
+
+  // Which parent menus are open. Starts with the parent that owns the active
+  // route auto-expanded; user toggles are preserved across navigation.
+  const [expanded, setExpanded] = useState<Record<string, boolean>>({})
+
+  useEffect(() => {
+    const parent = items.find((i) =>
+      i.children?.some((c) => pathname === c.href || pathname.startsWith(`${c.href}/`))
+    )
+    if (parent) {
+      setExpanded((prev) => (prev[parent.code] ? prev : { ...prev, [parent.code]: true }))
+    }
+  }, [pathname, items])
+
+  const toggleExpand = (code: string) =>
+    setExpanded((prev) => ({ ...prev, [code]: !prev[code] }))
+
   return (
     <nav
       className={cn(
-        "flex h-full flex-col rounded-3xl bg-white p-3 shadow-sm ring-1 ring-black/5 transition-[width] duration-200",
+        "flex h-full flex-col rounded-3xl bg-white p-3 shadow-sm ring-1 ring-black/5 transition-[width] duration-300 ease-in-out",
         !isMobile && (collapsed ? "w-20" : "w-64")
       )}
     >
       {/* Header */}
       <div
         className={cn(
-          "mb-10 flex items-center gap-2.5 px-4 py-3",
-          !isMobile && collapsed ? "flex-col-reverse justify-center gap-3 px-0" : "justify-between"
+          "mb-8 flex shrink-0 items-center gap-2.5 px-4 py-3",
+          iconOnly ? "flex-col-reverse justify-center gap-3 px-0" : "justify-between"
         )}
       >
         <Link href="/dashboard" className="flex items-center gap-2.5" onClick={onClose}>
@@ -93,7 +143,7 @@ function SidebarContent({
               <path d="M24 16c-3-8-11-12-16-8s-3 14 6 14c5 0 8.5-2.5 10-6 1.5 3.5 5 6 10 6 9 0 11-10 6-14s-13 0-16 8Z" />
             </svg>
           </div>
-          {(!collapsed || isMobile) && (
+          {!iconOnly && (
             <span className="text-lg font-bold tracking-tight text-slate-900">Hexa ERP</span>
           )}
         </Link>
@@ -108,79 +158,116 @@ function SidebarContent({
         </button>
       </div>
 
-      {/* Nav items */}
-      <ul className="flex flex-col gap-1">
-        {navItems.map((item) => {
+      {/* Nav items — scrolls internally when it overflows, without a visible
+          scrollbar so the rounded panel stays clean. */}
+      <ul className="flex min-h-0 flex-1 flex-col gap-1 overflow-y-auto [scrollbar-width:none] [&::-webkit-scrollbar]:hidden">
+        {items.map((item) => {
           const isActive =
             item.href === "/dashboard" ? pathname === item.href : pathname.startsWith(item.href)
+          const hasChildren = !!item.children?.length && !iconOnly
+          const isOpen = !!expanded[item.code]
 
           return (
             <li key={item.href}>
-              <Link
-                href={item.href}
-                title={!isMobile && collapsed ? item.title : undefined}
-                onClick={onClose}
+              <div
                 className={cn(
-                  "flex items-center gap-3 rounded-2xl px-4 py-3 text-base font-semibold transition-colors",
-                  !isMobile && collapsed && "justify-center px-0",
-                  isActive
-                    ? "bg-indigo-50 text-indigo-600"
-                    : "text-slate-700 hover:bg-slate-50"
+                  "flex items-center rounded-2xl transition-colors",
+                  isActive ? "bg-indigo-50" : "hover:bg-slate-50"
                 )}
               >
-                <item.icon
-                  className={cn("size-5 shrink-0", isActive ? "text-indigo-600" : "text-slate-400")}
-                />
-                {(!collapsed || isMobile) && (
-                  <>
-                    <span className="flex-1">{item.title}</span>
-                    {item.chevron && !item.children && !isActive && (
-                      <ChevronRight className="size-4 shrink-0 text-slate-300" />
-                    )}
-                  </>
-                )}
-              </Link>
+                <Link
+                  href={item.href}
+                  title={iconOnly ? item.title : undefined}
+                  onClick={onClose}
+                  className={cn(
+                    "flex flex-1 items-center gap-3 rounded-2xl px-4 py-3 text-base font-semibold",
+                    iconOnly && "justify-center px-0",
+                    isActive ? "text-indigo-600" : "text-slate-700"
+                  )}
+                >
+                  <item.icon
+                    className={cn("size-5 shrink-0", isActive ? "text-indigo-600" : "text-slate-400")}
+                  />
+                  {!iconOnly && (
+                    <>
+                      <span className="flex-1">{item.title}</span>
+                      {item.chevron && !hasChildren && (
+                        <ChevronRight
+                          className={cn("size-4 shrink-0", isActive ? "text-indigo-400" : "text-slate-300")}
+                        />
+                      )}
+                    </>
+                  )}
+                </Link>
 
-              {item.children && (!collapsed || isMobile) && (
-                <ul className="mt-1 flex flex-col gap-0.5 pl-11">
-                  {(() => {
-                    // Longest-matching href wins so a shared prefix (e.g. "Item" and
-                    // "Category" both live under /dashboard/products) doesn't light up
-                    // more than one sub-item at once.
-                    const activeChild = [...item.children]
-                      .filter((c) => pathname === c.href || pathname.startsWith(`${c.href}/`))
-                      .sort((a, b) => b.href.length - a.href.length)[0]
-                    return item.children.map((child) => {
-                    const childActive = child.href === activeChild?.href
-                    return (
-                      <li key={child.href}>
-                        <Link
-                          href={child.href}
-                          onClick={onClose}
-                          className={cn(
-                            "flex items-center gap-2.5 rounded-xl px-3 py-2 text-sm font-medium transition-colors",
-                            childActive
-                              ? "bg-indigo-50 text-indigo-600"
-                              : "text-slate-500 hover:bg-slate-50 hover:text-slate-700"
-                          )}
-                        >
-                          <child.icon
-                            className={cn("size-4 shrink-0", childActive ? "text-indigo-600" : "text-slate-400")}
-                          />
-                          {child.title}
-                        </Link>
-                      </li>
-                    )
-                    })
-                  })()}
-                </ul>
+                {hasChildren && (
+                  <button
+                    type="button"
+                    onClick={() => toggleExpand(item.code)}
+                    aria-label={isOpen ? `Collapse ${item.title}` : `Expand ${item.title}`}
+                    aria-expanded={isOpen}
+                    className={cn(
+                      "mr-2 flex size-7 shrink-0 items-center justify-center rounded-lg transition-colors hover:bg-white/60",
+                      isActive ? "text-indigo-500" : "text-slate-400"
+                    )}
+                  >
+                    <ChevronRight
+                      className={cn("size-4 transition-transform duration-300 ease-in-out", isOpen && "rotate-90")}
+                    />
+                  </button>
+                )}
+              </div>
+
+              {hasChildren && (
+                <div
+                  className={cn(
+                    "grid transition-all duration-300 ease-in-out",
+                    isOpen ? "mt-1 grid-rows-[1fr] opacity-100" : "grid-rows-[0fr] opacity-0"
+                  )}
+                >
+                  <div className="overflow-hidden">
+                    <ul className="flex flex-col gap-0.5 pl-11">
+                      {(() => {
+                        // Longest-matching href wins so a shared prefix (e.g. "Item" and
+                        // "Category" both live under /dashboard/products) doesn't light up
+                        // more than one sub-item at once.
+                        const activeChild = [...item.children!]
+                          .filter((c) => pathname === c.href || pathname.startsWith(`${c.href}/`))
+                          .sort((a, b) => b.href.length - a.href.length)[0]
+                        return item.children!.map((child) => {
+                          const childActive = child.href === activeChild?.href
+                          return (
+                            <li key={child.href}>
+                              <Link
+                                href={child.href}
+                                onClick={onClose}
+                                tabIndex={isOpen ? undefined : -1}
+                                className={cn(
+                                  "flex items-center gap-2.5 rounded-xl px-3 py-2 text-sm font-medium transition-colors",
+                                  childActive
+                                    ? "bg-indigo-50 text-indigo-600"
+                                    : "text-slate-500 hover:bg-slate-50 hover:text-slate-700"
+                                )}
+                              >
+                                <child.icon
+                                  className={cn("size-4 shrink-0", childActive ? "text-indigo-600" : "text-slate-400")}
+                                />
+                                {child.title}
+                              </Link>
+                            </li>
+                          )
+                        })
+                      })()}
+                    </ul>
+                  </div>
+                </div>
               )}
             </li>
           )
         })}
       </ul>
 
-      <div className="mt-auto flex items-center justify-center pt-6">
+      <div className="flex items-center justify-center pt-6">
         <div className="flex size-12 items-center justify-center rounded-2xl bg-slate-50 ring-1 ring-black/5">
           <svg viewBox="0 0 48 32" className="h-4 w-6 fill-slate-400">
             <path d="M24 16c-3-8-11-12-16-8s-3 14 6 14c5 0 8.5-2.5 10-6 1.5 3.5 5 6 10 6 9 0 11-10 6-14s-13 0-16 8Z" />
@@ -195,6 +282,19 @@ export function AppSidebar() {
   const pathname = usePathname() || "/"
   const [collapsed, setCollapsed] = useState(false)
   const [mobileOpen, setMobileOpen] = useState(false)
+  const { navCodes, loading } = useAuth()
+
+  // While /auth/me hasn't resolved yet, show nothing rather than briefly
+  // flashing the full menu to a restricted role. Once resolved, a nav item
+  // is visible if its own code is granted, or (for parents) if any child is.
+  const visibleItems = loading
+    ? []
+    : navItems
+        .filter((item) => navCodes.includes(item.code) || item.children?.some((c) => navCodes.includes(c.code)))
+        .map((item) => ({
+          ...item,
+          children: item.children?.filter((c) => navCodes.includes(c.code)),
+        }))
 
   // Close mobile menu on route change
   useEffect(() => {
@@ -213,6 +313,7 @@ export function AppSidebar() {
       {/* ── Desktop sidebar ─────────────────────────────── */}
       <div className="my-3 hidden lg:my-4 lg:flex">
         <SidebarContent
+          items={visibleItems}
           collapsed={collapsed}
           onCollapse={() => setCollapsed((v) => !v)}
           pathname={pathname}
@@ -247,6 +348,7 @@ export function AppSidebar() {
         )}
       >
         <SidebarContent
+          items={visibleItems}
           collapsed={false}
           onCollapse={() => {}}
           onClose={() => setMobileOpen(false)}

Frontend/erp-system/components/auth/AuthProvider.tsx

@@ -0,0 +1,63 @@
+"use client"
+
+// Authoritative session context: fetches GET /auth/me once per mount and exposes
+// the current role + permitted sidebar nav codes. Replaces trusting the stale,
+// client-only `roleId` cached by lib/auth-session.ts for anything access-related
+// (that cache remains display-only, e.g. for the header's user name).
+import { createContext, useContext, useEffect, useState } from "react"
+
+import { authApi } from "@/lib/api/auth"
+import { MeResponse } from "@/types/rbac"
+
+interface AuthContextValue {
+  roleCode: string | null
+  roleName: string | null
+  navCodes: string[]
+  /** True until the first `/auth/me` response lands. */
+  loading: boolean
+}
+
+const AuthContext = createContext<AuthContextValue>({
+  roleCode: null,
+  roleName: null,
+  navCodes: [],
+  loading: true,
+})
+
+export function AuthProvider({ children }: { children: React.ReactNode }) {
+  const [me, setMe] = useState<MeResponse | null>(null)
+
+  useEffect(() => {
+    let cancelled = false
+    authApi
+      .me()
+      .then((res) => {
+        if (!cancelled) setMe(res)
+      })
+      .catch(() => {
+        // Unauthenticated/unreachable — fall back to "no permissions" rather than
+        // crash the shell; proxy.ts already redirects unauthenticated users to /login.
+        if (!cancelled) setMe({ roleCode: null, roleName: null, navCodes: [] })
+      })
+    return () => {
+      cancelled = true
+    }
+  }, [])
+
+  return (
+    <AuthContext.Provider
+      value={{
+        roleCode: me?.roleCode ?? null,
+        roleName: me?.roleName ?? null,
+        navCodes: me?.navCodes ?? [],
+        loading: me === null,
+      }}
+    >
+      {children}
+    </AuthContext.Provider>
+  )
+}
+
+export function useAuth(): AuthContextValue {
+  return useContext(AuthContext)
+}

Frontend/erp-system/components/auth/RolePermissionTree.tsx

@@ -0,0 +1,85 @@
+"use client"
+
+// Checkbox tree for assigning a role's visible sidebar sections. Leaf nav items
+// (no children) are toggled directly; parent nav items with children are a
+// "select all children" convenience toggle — the parent's own visibility is
+// derived from its children on the frontend (see AppSidebar.tsx's filter), so
+// only the children need to carry the actual grant for those groups.
+import { Checkbox } from "@/components/ui/checkbox"
+import { Label } from "@/components/ui/label"
+import { NavItem } from "@/types/rbac"
+
+interface Props {
+  tree: NavItem[]
+  selectedNavItemIds: Set<number>
+  selectedSubNavItemIds: Set<number>
+  onChange: (navItemIds: Set<number>, subNavItemIds: Set<number>) => void
+}
+
+export function RolePermissionTree({ tree, selectedNavItemIds, selectedSubNavItemIds, onChange }: Props) {
+  function toggleLeaf(navItemId: number) {
+    const next = new Set(selectedNavItemIds)
+    if (next.has(navItemId)) next.delete(navItemId)
+    else next.add(navItemId)
+    onChange(next, selectedSubNavItemIds)
+  }
+
+  function toggleChild(subNavItemId: number) {
+    const next = new Set(selectedSubNavItemIds)
+    if (next.has(subNavItemId)) next.delete(subNavItemId)
+    else next.add(subNavItemId)
+    onChange(selectedNavItemIds, next)
+  }
+
+  function toggleAllChildren(item: NavItem, checked: boolean) {
+    const next = new Set(selectedSubNavItemIds)
+    for (const child of item.children) {
+      if (checked) next.add(child.subNavItemId)
+      else next.delete(child.subNavItemId)
+    }
+    onChange(selectedNavItemIds, next)
+  }
+
+  return (
+    <div className="flex flex-col gap-1 rounded-lg border p-4">
+      {tree.map((item) => {
+        if (item.children.length === 0) {
+          return (
+            <label key={item.navItemId} className="flex items-center gap-3 rounded-md px-2 py-2 hover:bg-muted/50">
+              <Checkbox
+                checked={selectedNavItemIds.has(item.navItemId)}
+                onCheckedChange={() => toggleLeaf(item.navItemId)}
+              />
+              <Label className="cursor-pointer text-base font-medium">{item.label}</Label>
+            </label>
+          )
+        }
+
+        const checkedCount = item.children.filter((c) => selectedSubNavItemIds.has(c.subNavItemId)).length
+        const allChecked = checkedCount === item.children.length
+
+        return (
+          <div key={item.navItemId} className="flex flex-col gap-1 border-t pt-2 first:border-t-0 first:pt-0">
+            <label className="flex items-center gap-3 rounded-md px-2 py-2 hover:bg-muted/50">
+              <Checkbox checked={allChecked} onCheckedChange={(checked) => toggleAllChildren(item, !!checked)} />
+              <Label className="cursor-pointer text-base font-semibold">
+                {item.label} {checkedCount > 0 && !allChecked && <span className="text-sm font-normal text-muted-foreground">({checkedCount} of {item.children.length})</span>}
+              </Label>
+            </label>
+            <div className="flex flex-col gap-1 pl-9">
+              {item.children.map((child) => (
+                <label key={child.subNavItemId} className="flex items-center gap-3 rounded-md px-2 py-1.5 hover:bg-muted/50">
+                  <Checkbox
+                    checked={selectedSubNavItemIds.has(child.subNavItemId)}
+                    onCheckedChange={() => toggleChild(child.subNavItemId)}
+                  />
+                  <Label className="cursor-pointer text-sm">{child.label}</Label>
+                </label>
+              ))}
+            </div>
+          </div>
+        )
+      })}
+    </div>
+  )
+}

Frontend/erp-system/components/ui/select.tsx

@@ -6,7 +6,40 @@ import { Select as SelectPrimitive } from "@base-ui/react/select"
 import { cn } from "@/lib/utils"
 import { ChevronDownIcon, CheckIcon, ChevronUpIcon } from "lucide-react"
 
-const Select = SelectPrimitive.Root
+// Base UI's `Select.Value` renders the raw selected value (e.g. an id) unless the Root is
+// given an `items` map to resolve the label from — the popup items are unmounted when closed,
+// so their text isn't otherwise available. Rather than pass `items` at all ~60 call sites,
+// this wrapper walks its own `SelectItem` children and derives that map automatically, so the
+// trigger shows the selected item's label instead of its value.
+function collectItems(
+  children: React.ReactNode,
+  acc: { value: unknown; label: React.ReactNode }[]
+) {
+  React.Children.forEach(children, (child) => {
+    if (!React.isValidElement(child)) return
+    if (child.type === SelectItem) {
+      const p = child.props as { value?: unknown; children?: React.ReactNode }
+      acc.push({ value: p.value, label: p.children })
+      return
+    }
+    const nested = (child.props as { children?: React.ReactNode }).children
+    if (nested) collectItems(nested, acc)
+  })
+}
+
+function Select<Value, Multiple extends boolean | undefined = false>(
+  props: SelectPrimitive.Root.Props<Value, Multiple>
+) {
+  const { items, children } = props
+  const derivedItems = React.useMemo(() => {
+    if (items) return items
+    const acc: { value: unknown; label: React.ReactNode }[] = []
+    collectItems(children, acc)
+    return acc.length ? (acc as ReadonlyArray<{ value: Value; label: React.ReactNode }>) : undefined
+  }, [items, children])
+
+  return <SelectPrimitive.Root {...props} items={derivedItems} />
+}
 
 function SelectGroup({ className, ...props }: SelectPrimitive.Group.Props) {
   return (

Frontend/erp-system/lib/api/auth.ts

@@ -2,8 +2,14 @@
 // delivers the session as httpOnly cookies — there is no token for JS to hold or attach.
 import { apiRequest } from "@/lib/api-client"
 import { AuthSession, LoginRequest, RegisterRequest } from "@/types/auth"
+import { MeResponse } from "@/types/rbac"
 
 export const authApi = {
+  /** Authoritative role + permitted sidebar nav codes for the current session. */
+  me(): Promise<MeResponse> {
+    return apiRequest<MeResponse>("/auth/me")
+  },
+
   /** Sets erp_at / erp_rt / XSRF-TOKEN cookies on success. Body carries no tokens. */
   login(request: LoginRequest): Promise<AuthSession> {
     return apiRequest<AuthSession>("/auth/login", { method: "POST", body: request })

Frontend/erp-system/lib/api/nav.ts

@@ -0,0 +1,9 @@
+// Read-only sidebar nav tree (ERPCore Controllers/NavController.cs).
+import { apiRequest } from "@/lib/api-client"
+import { NavItem } from "@/types/rbac"
+
+export const navApi = {
+  tree(): Promise<NavItem[]> {
+    return apiRequest<NavItem[]>("/nav")
+  },
+}

Frontend/erp-system/lib/api/purchase-orders.ts

@@ -20,10 +20,10 @@ export interface ListPurchaseOrdersParams {
   sort?: string
 }
 
-/** Editable while open (FR-PROC-05, Option B). The server is authoritative — it returns
- *  409 PO_NOT_EDITABLE regardless — this only drives UI affordances. */
+/** Editable/deletable only while Draft (FR-PROC-05, revised — submitting locks the PO).
+ *  The server is authoritative (409 PO_NOT_EDITABLE otherwise); this only drives UI affordances. */
 export function isPoEditable(status: PurchaseOrderStatus): boolean {
-  return status !== "FullyReceived" && status !== "Closed" && status !== "Cancelled"
+  return status === "Draft"
 }
 
 export const purchaseOrdersApi = {
@@ -54,6 +54,16 @@ export const purchaseOrdersApi = {
     return apiRequest<PurchaseOrder>(`/purchase-orders/${poId}/approve`, { method: "POST" })
   },
 
+  /** Submit a Draft PO (Draft → Approved). 409 PO_NOT_EDITABLE if not Draft. */
+  submit(poId: number): Promise<PurchaseOrder> {
+    return apiRequest<PurchaseOrder>(`/purchase-orders/${poId}/submit`, { method: "POST" })
+  },
+
+  /** Delete a Draft PO. 409 PO_NOT_EDITABLE once submitted. */
+  remove(poId: number): Promise<void> {
+    return apiRequest<void>(`/purchase-orders/${poId}`, { method: "DELETE" })
+  },
+
   /** 409 if any receipt exists against the PO. */
   cancel(poId: number, request: CancelPurchaseOrderRequest): Promise<PurchaseOrder> {
     return apiRequest<PurchaseOrder>(`/purchase-orders/${poId}/cancel`, { method: "POST", body: request })

Frontend/erp-system/lib/api/roles.ts

@@ -0,0 +1,51 @@
+// Role CRUD + permission assignment (ERPCore Controllers/RolesController.cs).
+import { apiRequest, apiRequestWithETag, buildQuery } from "@/lib/api-client"
+import { ApiResult, EntityStatus, PagedResponse } from "@/types/common"
+import {
+  AssignRolePermissionsRequest,
+  CreateRoleRequest,
+  Role,
+  RolePermissions,
+  UpdateRoleRequest,
+} from "@/types/rbac"
+
+export interface ListRolesParams {
+  page?: number
+  pageSize?: number
+  q?: string
+  status?: EntityStatus
+}
+
+export const rolesApi = {
+  list(params: ListRolesParams = {}): Promise<PagedResponse<Role>> {
+    return apiRequest<PagedResponse<Role>>(`/roles${buildQuery(params)}`)
+  },
+
+  get(roleId: number): Promise<ApiResult<Role>> {
+    return apiRequestWithETag<Role>(`/roles/${roleId}`)
+  },
+
+  create(request: CreateRoleRequest): Promise<ApiResult<Role>> {
+    return apiRequestWithETag<Role>("/roles", { method: "POST", body: request })
+  },
+
+  update(roleId: number, request: UpdateRoleRequest, ifMatch: string): Promise<ApiResult<Role>> {
+    return apiRequestWithETag<Role>(`/roles/${roleId}`, { method: "PUT", body: request, ifMatch })
+  },
+
+  updateStatus(roleId: number, status: EntityStatus): Promise<void> {
+    return apiRequest<void>(`/roles/${roleId}/status`, { method: "PATCH", body: { status } })
+  },
+
+  remove(roleId: number): Promise<void> {
+    return apiRequest<void>(`/roles/${roleId}`, { method: "DELETE" })
+  },
+
+  getPermissions(roleId: number): Promise<RolePermissions> {
+    return apiRequest<RolePermissions>(`/roles/${roleId}/permissions`)
+  },
+
+  assignPermissions(roleId: number, request: AssignRolePermissionsRequest): Promise<RolePermissions> {
+    return apiRequest<RolePermissions>(`/roles/${roleId}/permissions`, { method: "PUT", body: request })
+  },
+}

Frontend/erp-system/lib/api/users.ts

@@ -0,0 +1,33 @@
+// User management (ERPCore Controllers/UsersController.cs). Create orchestrates
+// account creation in both AuthHex and ERPCore's local shadow table server-side.
+import { apiRequest, buildQuery } from "@/lib/api-client"
+import { PagedResponse } from "@/types/common"
+import { CreateUserRequest, ManagedUser, UpdateUserRoleRequest, UserTypeOption } from "@/types/users"
+
+export interface ListUsersParams {
+  page?: number
+  pageSize?: number
+  q?: string
+}
+
+export const usersApi = {
+  list(params: ListUsersParams = {}): Promise<PagedResponse<ManagedUser>> {
+    return apiRequest<PagedResponse<ManagedUser>>(`/users${buildQuery(params)}`)
+  },
+
+  get(userId: number): Promise<ManagedUser> {
+    return apiRequest<ManagedUser>(`/users/${userId}`)
+  },
+
+  create(request: CreateUserRequest): Promise<ManagedUser> {
+    return apiRequest<ManagedUser>("/users", { method: "POST", body: request })
+  },
+
+  updateRole(userId: number, request: UpdateUserRoleRequest): Promise<ManagedUser> {
+    return apiRequest<ManagedUser>(`/users/${userId}/role`, { method: "PUT", body: request })
+  },
+
+  userTypes(): Promise<UserTypeOption[]> {
+    return apiRequest<UserTypeOption[]>("/users/user-types")
+  },
+}

Frontend/erp-system/lib/validations.ts

@@ -15,18 +15,10 @@ export const emailSchema = z.string().min(1, "Email is required").email("Enter a
 // Login schema (email + password) for reuse across the app
 export const loginSchema = z.object({
 	email: emailSchema,
-	password: requiredString("Password is required")
-		.refine((val) => val.length >= 8, { message: "Password must be at least 8 characters" })
-		.refine((val) => /[A-Z]/.test(val), {
-			message: "Password must contain at least one uppercase letter",
-		})
-		.refine((val) => /[a-z]/.test(val), {
-			message: "Password must contain at least one lowercase letter",
-		})
-		.refine((val) => /[0-9]/.test(val), { message: "Password must contain at least one number" })
-		.refine((val) => /[!@#$%^&*(),.?":{}|<>\[\]\\/`~;'+=-]/.test(val), {
-			message: "Password must contain at least one special character",
-		}),
+	// Login only checks that a password was typed — complexity rules belong to
+	// signup/reset. Enforcing them here just leaks the policy and blocks users
+	// whose existing password predates it; the server decides what's valid.
+	password: requiredString("Password is required"),
 })
 
 export type LoginValues = z.infer<typeof loginSchema>

Frontend/erp-system/lib/validations/grn.ts

@@ -16,6 +16,8 @@ export function validateLine(input: {
   uomId: number | null
   qty: string
   unitCost: string
+  discountPct: string
+  vatPct: string
   trackingMode: TrackingMode | null
   batchNo: string
   serialNumbersText: string
@@ -31,6 +33,14 @@ export function validateLine(input: {
   const unitCost = Number(input.unitCost)
   if (input.unitCost === "" || Number.isNaN(unitCost) || unitCost < 0) errors.unitCost = "Unit cost cannot be negative"
 
+  const discountPct = Number(input.discountPct)
+  if (input.discountPct !== "" && (Number.isNaN(discountPct) || discountPct < 0 || discountPct > 100))
+    errors.discountPct = "Discount must be 0–100%"
+
+  const vatPct = Number(input.vatPct)
+  if (input.vatPct !== "" && (Number.isNaN(vatPct) || vatPct < 0 || vatPct > 100))
+    errors.vatPct = "VAT must be 0–100%"
+
   if (input.trackingMode === "Batch" && !input.batchNo.trim()) {
     errors.batchNo = "Batch number is required for this item"
   }

Frontend/erp-system/lib/validations/master-data.ts

@@ -73,3 +73,23 @@ export function validateVariantItemForm(input: {
   if (!input.hasVariants) errors.variants = "Check at least one variant category and add its values"
   return errors
 }
+
+/**
+ * Fixed-price mode requires every generated variant to carry a sale price > 0
+ * (docs/20 §3.1). Returns a map keyed by variant key → message; empty when valid.
+ * In "stock" mode there is nothing to validate (prices are sent as null).
+ */
+export function validateVariantPrices(
+  variantKeys: string[],
+  priceFor: (key: string) => string,
+): Record<string, string> {
+  const errors: Record<string, string> = {}
+  for (const key of variantKeys) {
+    const raw = priceFor(key).trim()
+    const value = Number(raw)
+    if (raw === "" || Number.isNaN(value) || value <= 0) {
+      errors[key] = "Enter a price greater than 0"
+    }
+  }
+  return errors
+}

Frontend/erp-system/types/grn.ts

@@ -29,7 +29,16 @@ export interface CreateGrnLineInput {
   uomId: number
   binId?: number | null
   qty: number
+  /**
+   * Gross unit cost. For a PO line it is an optional per-receipt override — 0/omitted uses
+   * the PO price; a value wins and the server records a variance (docs/02-SECURITY C.3,
+   * revised). Required (> 0) for a direct receipt.
+   */
   unitCost: number
+  /** Trade discount % (0–100). Reduces inventory cost. */
+  discountPct?: number
+  /** VAT % (0–100). Recoverable — does not affect stock value. */
+  vatPct?: number
   holdStatus: HoldStatus
   batch?: BatchInput | null
 }
@@ -49,8 +58,21 @@ export interface GrnLine {
   uomId: number
   binId: number | null
   qty: number
+  /** Gross unit cost received at. */
   unitCost: number
+  /** PO price snapshot at receipt; null for direct receipts. */
+  poUnitPrice: number | null
+  discountPct: number
+  /** After-discount cost — what the FIFO layer is valued at. */
+  netUnitCost: number
+  vatPct: number
+  vatAmount: number
+  /** qty × netUnitCost (after discount, before VAT). */
   receivedValue: number
+  /** qty × netUnitCost + vatAmount — payable to vendor. */
+  lineTotal: number
+  /** (unitCost − poUnitPrice) × qty; 0 for direct receipts. */
+  priceVariance: number
   holdStatus: HoldStatus
   batchId: number | null
 }

Frontend/erp-system/types/master-data.ts

@@ -22,6 +22,8 @@ export interface ItemListItem {
   stockNature: StockNature
   trackingMode: TrackingMode
   taxClass: string | null
+  /** Fixed sale price (Sales only); null ⇒ sell at stock/FIFO value. */
+  salePrice: number | null
   status: EntityStatus
 }
 
@@ -59,6 +61,8 @@ export interface Item {
   stockNature: StockNature
   trackingMode: TrackingMode
   taxClass: string | null
+  /** Fixed sale price (Sales only); null ⇒ sell at stock/FIFO value. */
+  salePrice: number | null
   status: EntityStatus
   reorder: ItemReorderSetting[]
   conversions: UomConversion[]
@@ -81,6 +85,8 @@ export interface CreateItemRequest {
   stockNature: StockNature
   trackingMode: TrackingMode
   taxClass?: string | null
+  /** Optional fixed sale price (Sales only). Null/omitted ⇒ sell at stock/FIFO value. */
+  salePrice?: number | null
 }
 
 export type UpdateItemRequest = CreateItemRequest

Frontend/erp-system/types/procurement.ts

@@ -189,10 +189,12 @@ export interface CreatePurchaseOrderRequest {
   vendorId: number
   requisitionId?: number | null
   lines: CreatePoLineInput[]
+  /** When true the PO is created as an editable/deletable Draft; false (default) auto-approves. */
+  saveAsDraft?: boolean
 }
 
-/** PUT /purchase-orders/{poId} — edit-while-open, same line shape as create (FR-PROC-05, Option B). */
-export type UpdatePurchaseOrderRequest = CreatePurchaseOrderRequest
+/** PUT /purchase-orders/{poId} — edit a Draft only (FR-PROC-05, revised); same line shape as create. */
+export type UpdatePurchaseOrderRequest = Omit<CreatePurchaseOrderRequest, "saveAsDraft">
 
 export interface CancelPurchaseOrderRequest {
   reason?: string | null

Frontend/erp-system/types/rbac.ts

@@ -0,0 +1,58 @@
+// Role / Nav / Permission DTOs (mirrors ERPCore's Dtos/Rbac/*.cs exactly).
+import { EntityStatus } from "@/types/common"
+
+export interface Role {
+  roleId: number
+  code: string
+  name: string
+  isSystemRole: boolean
+  status: EntityStatus
+  createdAt: string
+  updatedAt: string | null
+}
+
+export interface CreateRoleRequest {
+  code: string
+  name: string
+}
+
+export interface UpdateRoleRequest {
+  code: string
+  name: string
+}
+
+export interface SubNavItem {
+  subNavItemId: number
+  code: string
+  label: string
+  icon: string | null
+  href: string | null
+  sortOrder: number
+}
+
+export interface NavItem {
+  navItemId: number
+  code: string
+  label: string
+  icon: string | null
+  href: string | null
+  sortOrder: number
+  children: SubNavItem[]
+}
+
+export interface RolePermissions {
+  roleId: number
+  navItemIds: number[]
+  subNavItemIds: number[]
+}
+
+export interface AssignRolePermissionsRequest {
+  navItemIds: number[]
+  subNavItemIds: number[]
+}
+
+export interface MeResponse {
+  roleCode: string | null
+  roleName: string | null
+  navCodes: string[]
+}

Frontend/erp-system/types/users.ts

@@ -0,0 +1,35 @@
+// Managed-user DTOs (mirrors ERPCore's Dtos/Users/UserDtos.cs).
+import { EntityStatus } from "@/types/common"
+
+export interface ManagedUser {
+  userId: number
+  username: string
+  displayName: string
+  status: EntityStatus
+  roleId: number | null
+  roleCode: string | null
+  roleName: string | null
+}
+
+export interface CreateUserRequest {
+  username: string
+  fullName: string
+  roleId: number
+  userTypeId: string
+  email: string
+  nic?: string | null
+  mobileNumber?: string | null
+  /** Left empty to auto-generate — AuthHex emails it to `email`. */
+  password?: string | null
+}
+
+export interface UpdateUserRoleRequest {
+  roleId: number
+}
+
+/** AuthHex UserType lookup, for the create-user form's select (no local shadow — read-only). */
+export interface UserTypeOption {
+  userTypeId: string
+  code: string | null
+  description: string | null
+}

docs/02-SECURITY.md

@@ -74,6 +74,7 @@ These are known, deliberately-accepted Phase-1 exposures. Each has a compensatin
 - [ ] Create/update DTOs exclude server-controlled fields (`status`, ids, timestamps)
 - [ ] Deactivate — not delete — referenced masters (FR-MD-08); hard delete blocked → `MASTER_IN_USE`
 - [ ] Nested/reference writes validate the target exists and is active
+- [ ] `Item.salePrice` is a **legitimately client-supplied** field (a deliberate exception to B.6's over-posting list) — validated `>= 0` server-side, nullable. It is **Sales-only** (never enters GRN/FIFO/ledger), so unlike GRN `unitCost` it has **no** inventory-value or costing impact; the fixed/stock-value choice is frontend UX (`docs/11 §2.1`).
 
 ### C.2 Procurement (Requisition / RFQ / PO / Purchase Return)
 - [ ] PO totals computed **server-side** from lines (never trust client totals)
@@ -83,10 +84,11 @@ These are known, deliberately-accepted Phase-1 exposures. Each has a compensatin
 - [ ] Note in review: **AR-01/AR-02/AR-03** apply to these endpoints
 
 ### C.3 GRN
-- [ ] `unitCost` **derived from the PO line server-side**; any client-supplied cost is ignored *(decision locked)*
-- [ ] `receivedValue` computed server-side (qty × PO-line cost), not accepted from client
-- [ ] Direct GRN (no PO) is the exception where cost is entered → extra scrutiny + review flag + audit (**AR-04**)
-- [ ] Over-receipt tolerance enforced server-side → `OVER_RECEIPT_TOLERANCE`
+- [ ] `unitCost` **defaults to the PO line price**; a per-line override **is now permitted** *(decision revised 2026-07-20 — was "locked, client cost ignored")*. When an override is entered it is used, and the PO price is snapshotted (`poUnitPrice`) so a **`priceVariance` is recorded** against it for review. Rationale: one PO legitimately spans batches received at different prices; the variance trail (plus the audit log) is the compensating control that replaces the old hard block.
+- [ ] **Derived figures stay server-computed** — `netUnitCost`/`receivedValue`/`vatAmount`/`lineTotal` are never accepted from the client, so the client cannot inflate stock value except by an *auditable* unit-cost override. Discount reduces inventory cost; **VAT is recoverable and never enters stock value**.
+- [ ] Direct GRN (no PO) remains the higher-scrutiny path where cost is entered with no PO to compare against → review flag + audit (**AR-04**)
+- [ ] **Off-PO lines on a PO-based GRN** (`poLineId: null`, 2026-07-22) are the **same exposure class as AR-04** — cost is entered with no PO line to compare against, and `OVER_RECEIPT_TOLERANCE` does not apply to them. Treat them with the direct-receipt scrutiny (review flag + audit); they do not touch PO balances.
+- [ ] Over-receipt tolerance enforced server-side → `OVER_RECEIPT_TOLERANCE` (PO-linked lines only; off-PO lines have no PO qty to check)
 - [ ] On-hold stock is not issuable (FR-WH-07); expired batch blocked
 
 ### C.4 Stock Core (FIFO / Ledger)

docs/10-BACKEND-PHASE1.md

@@ -118,7 +118,7 @@ One base currency; invoicing/3-way match in Accounting (GRN carries data); users
 ### B.3.1 Master Data (FR-MD)
 | ID | Requirement | Pri |
 |---|---|---|
-| FR-MD-01 | Maintain **Item master**: SKU (unique), name, description, category (+ optional subcategory), optional brand, **stock nature** (Stocked/NonStocked/Service), tracking mode (None/Batch/Serial), status, tax class, default vendor. | M |
+| FR-MD-01 | Maintain **Item master**: SKU (unique), name, description, category (+ optional subcategory), optional brand, **stock nature** (Stocked/NonStocked/Service), tracking mode (None/Batch/Serial), status, tax class, default vendor, **optional fixed sale price** (nullable; Sales-only — never enters costing/GRN/FIFO; `null` ⇒ item is sold at its stock/FIFO value). | M |
 | FR-MD-02 | Maintain **UOM master** with base UOM per item and **conversion factors** (purchase→stock→base). | M |
 | FR-MD-03 | Convert quantities between UOMs on every transaction; store base-UOM quantity in the ledger. | M |
 | FR-MD-04 | Maintain **item categories with one optional subcategory level**. An item references a category (required) and a subcategory (optional) that must belong to it. Deeper nesting is not supported. | S |
@@ -137,7 +137,7 @@ One base currency; invoicing/3-way match in Accounting (GRN carries data); users
 | FR-PROC-02 | Optional **RFQ**: issue to vendors, record quotations for comparison. | S |
 | FR-PROC-03 | Generate **PO** from PR/RFQ or directly (item, UOM, qty, price, tax, delivery date, warehouse). | M |
 | FR-PROC-04 | **[Phase 1: auto-approve]** Auto-approve PO on creation (status `Approved`). Config flag `approvalRequired` (default off) gates a future approval workflow (authorization matrix); when on, PO cannot issue until approved. `PendingApproval` state + approval fields retained in schema (no migration to enable). | M |
-| FR-PROC-05 | **[Phase 1: Option B — edit-while-open]** PO may be **freely edited while open** (not fully received/closed); changes take effect immediately with an audit entry. Versioned amendments deferred; schema must not preclude adding a version field later. | S |
+| FR-PROC-05 | **[Phase 1: Option B *superseded* 2026-07-20 — draft-lock]** A PO is **editable and deletable only while `Draft`**; **submitting locks it** (Draft → Approved) and no further edit/delete/add-line is allowed — an issued PO is corrected by Cancel-with-reason (blocked once receipts exist) or a reversing document, never edited. Create takes `saveAsDraft` (default `false` → auto-approve, preserving the Requisition→PO / RFQ→PO flows). *Why the reversal:* Option B ("freely edit while open") let an already-issued, vendor-facing PO change silently after the fact; the draft/submit boundary makes "issued to vendor" a real, immutable commitment. Versioned amendments still deferred; schema unchanged (reuses the existing `Draft` enum value). | S |
 | FR-PROC-06 | PO lifecycle: Draft → (PendingApproval →) Approved → PartiallyReceived → FullyReceived → Closed/Cancelled. Phase 1 bypasses PendingApproval via auto-approve. | M |
 | FR-PROC-07 | Support **partial receipt**; PO stays open until fully received or manually closed. | M |
 | FR-PROC-08 | Support **Purchase Return** referencing original GRN/PO line; generates outbound movement. | M |
@@ -146,12 +146,12 @@ One base currency; invoicing/3-way match in Accounting (GRN carries data); users
 ### B.3.3 Goods Receipt (FR-GRN)
 | ID | Requirement | Pri |
 |---|---|---|
-| FR-GRN-01 | Create **GRN** against an approved PO, defaulting lines/quantities from open PO lines. | M |
+| FR-GRN-01 | Create **GRN** against an approved PO, defaulting lines/quantities from open PO lines. **Additional lines for items not on the PO are permitted** — a line with no `po_line_id` is received like a direct receipt (entered cost, no over-receipt check) and does not affect PO line balances. Off-PO lines are a review surface (see 02-SECURITY C.3). | M |
 | FR-GRN-02 | Support **GRN without PO** (direct/emergency) by permission, flagged for review. | S |
 | FR-GRN-03 | Support **over/under-receipt tolerances** (per item or global); warn or block beyond tolerance. | S |
 | FR-GRN-04 | Capture **batch + expiry** and/or **serial numbers** for tracked items on receipt. | M |
 | FR-GRN-05 | Allow receipt into **inspection/quarantine hold** (not issuable) pending QC, before QC module exists. | M |
-| FR-GRN-06 | On confirm, each line **creates a FIFO cost layer** at unit cost (PO price + attributable charges; landed cost per §B.1.2.1) and posts an inbound ledger entry. | M |
+| FR-GRN-06 | On confirm, each line **creates a FIFO cost layer** at the **after-discount net unit cost** (`unitCost × (1 − discountPct/100)`) and posts an inbound ledger entry. **VAT never enters stock value** — it is recoverable input tax (revised 2026-07-20). PO price is the default unit cost; a per-line override is permitted and recorded as a variance (see 02-SECURITY C.3, revised). | M |
 | FR-GRN-07 | Record **received value per line** and PO reference for downstream matching. | M |
 | FR-GRN-08 | Assign received stock to a **bin/location** (putaway). | S |
 
@@ -194,7 +194,7 @@ One base currency; invoicing/3-way match in Accounting (GRN carries data); users
 | FR-X-05 | No editing/deleting confirmed/posted transactions; corrections via reversing entries. | M |
 
 ## B.4 Data Model (summary)
-Key entities and relationships are enumerated in **Part C**. The commitment: Item, UOM/UOMConversion, Category, SubCategory, Brand, ItemType, ProductConfig, Vendor, Warehouse/Bin, ItemReorder, Requisition(+Line), RFQ(+Line)/VendorQuotation, PurchaseOrder(+Line), GRN(+Line), PurchaseReturn(+Line), StockLayer (FIFO), StockLedger (immutable), Batch, Serial, StockTransfer(+Line), StockAdjustment(+Line), StockCount(+Line), User, ReasonCode, NumberSequence, AuditLog, JournalEntryStub, and reserved RBAC (Role, Permission, UserRole, RolePermission).
+Key entities and relationships are enumerated in **Part C**. The commitment: Item, UOM/UOMConversion, Category, SubCategory, Brand, ItemType, ProductConfig, Vendor, Warehouse/Bin, ItemReorder, Requisition(+Line), RFQ(+Line)/VendorQuotation, PurchaseOrder(+Line), GRN(+Line), PurchaseReturn(+Line), StockLayer (FIFO), StockLedger (immutable), Batch, Serial, StockTransfer(+Line), StockAdjustment(+Line), StockCount(+Line), User, ReasonCode, NumberSequence, AuditLog, JournalEntryStub, and RBAC for sidebar visibility (Role, NavItem, SubNavItem, Permission, RolePermission — see C.8; per-endpoint enforcement still deferred).
 
 ## B.5 External Interfaces
 UI: responsive; count/pick screens handheld-friendly; status badges; mandatory-field validation. Hardware: barcode/QR (designed-for). Software: relational DB with transactional integrity + row locking; internal service interfaces/events for Phase-2+ modules.
@@ -250,6 +250,8 @@ Adjustment: Damage, Theft/Loss, Count Variance, Expiry Write-off, System Correct
 | 11 | Category hierarchy depth | **Resolved:** dedicated `SUBCATEGORY` table, exactly two levels; `CATEGORY.parent_id` dropped. Item carries both FKs (subcategory nullable). Arbitrary nesting is not coming back. |
 | 12 | Item types / variants | **Resolved:** the `ItemType` **enum** was replaced by an **unreferenced master list**; Stocked/NonStocked/Service survives as `stock_nature`. Values are **SKU-encoded only** — no value table, no item link, no product-variation model (Part C.9 records the accepted trade-off). |
 | 13 | Product-config authorization | **Open:** `PUT /product-config` is gated by the door policy only, like every other endpoint. A `CONFIG_MANAGE` permission is reserved for when per-endpoint RBAC lands (decision #6). Until then any ERP-admitted user can flip the flags. |
+| 14 | Item sale price (fixed vs stock value) | **Resolved (2026-07-22):** a single **nullable** `ITEM.sale_price` — `NULL` ⇒ sell at stock/FIFO value, a value ⇒ fixed price. **Sales-only** (never touches GRN/FIFO/ledger). No `price_mode` enum; the create-time fixed/stock toggle is frontend UX that requires a price per generated variant when "fixed" is chosen (Part C.9). |
+| 15 | Off-PO lines on a PO-based GRN | **Resolved (2026-07-22):** allowed. `GRN_LINE.po_line_id` is nullable; a null line on a PO-based GRN is received like a direct receipt (entered cost, no over-receipt check) and does not touch PO balances. Same cost-entry/fraud surface as GRN-without-PO (AR-04) — flagged for review, not blocked (02-SECURITY C.3). |
 
 ---
 
@@ -267,7 +269,8 @@ UOM(uom_id PK, name)
 UOM_CONVERSION(conversion_id PK, item_id FK→ITEM, from_uom FK→UOM, to_uom FK→UOM, factor)
 ITEM(item_id PK, sku, name, category_id FK→CATEGORY, subcategory_id FK→SUBCATEGORY [nullable],
      brand_id FK→BRAND [nullable], base_uom_id FK→UOM,
-     default_vendor_id FK→VENDOR, stock_nature, tracking_mode, tax_class, status)
+     default_vendor_id FK→VENDOR, stock_nature, tracking_mode, tax_class,
+     sale_price [nullable], status)   -- sale_price: Sales-only selling price; NULL ⇒ sell at stock (FIFO) value
 ITEM_REORDER(reorder_id PK, item_id FK→ITEM, warehouse_id FK→WAREHOUSE, reorder_point, reorder_qty)
 VENDOR(vendor_id PK, code, name, terms, tax_reg, currency, status)
 WAREHOUSE(warehouse_id PK, code, name)
@@ -303,8 +306,9 @@ PURCHASE_RETURN_LINE(return_line_id PK, return_id FK→PURCHASE_RETURN,
 ```
 GRN(grn_id PK, doc_no, po_id FK→PURCHASE_ORDER, vendor_id FK→VENDOR,
      warehouse_id FK→WAREHOUSE, status, created_by FK→USER, created_at)
-GRN_LINE(grn_line_id PK, grn_id FK→GRN, po_line_id FK→PO_LINE, item_id FK→ITEM, uom_id FK→UOM,
+GRN_LINE(grn_line_id PK, grn_id FK→GRN, po_line_id FK→PO_LINE [nullable], item_id FK→ITEM, uom_id FK→UOM,
      bin_id FK→BIN, batch_id FK→BATCH, qty, unit_cost, received_value, hold_status)
+     -- po_line_id nullable: NULL for a direct receipt OR an off-PO line added to a PO-based GRN (FR-GRN-01)
 ```
 
 ## C.4 Batch / Serial
@@ -348,17 +352,21 @@ AUDIT_LOG(audit_id PK, user_id FK→USER, entity_type, entity_id, action, change
 JOURNAL_ENTRY_STUB(journal_id PK, source_doc_type, source_doc_id, debit_account, credit_account, amount)
 ```
 
-## C.8 Reserved (RBAC — deferred, schema placeholder only)
+## C.8 RBAC — sidebar-visibility only (implemented 2026-07-18); per-endpoint enforcement still deferred
 ```
-ROLE(role_id PK, name)
-PERMISSION(permission_id PK, code)
-USER_ROLE(user_id FK→USER, role_id FK→ROLE)
+ROLE(role_id PK, auth_role_id [GUID, unique] → AuthHex Role, code, name, is_system_role, status, created_at, updated_at, row_version)  -- local shadow/projection of AuthHex's Role, same pattern as USER
+NAV_ITEM(nav_item_id PK, code, label, icon, href, sort_order, status)         -- top-level sidebar entry; seeded to match the frontend
+SUB_NAV_ITEM(sub_nav_item_id PK, nav_item_id FK→NAV_ITEM, code, label, icon, href, sort_order, status)
+PERMISSION(permission_id PK, code, nav_item_id FK→NAV_ITEM [nullable], sub_nav_item_id FK→SUB_NAV_ITEM [nullable])  -- exactly one of the two FKs is set
 ROLE_PERMISSION(role_id FK→ROLE, permission_id FK→PERMISSION)
+USER(..., role_id FK→ROLE [nullable])  -- added to the existing USER shadow (see C.7)
 ```
+Note: `USER_ROLE` from the original placeholder sketch was dropped — a user has at most one role (`USER.role_id`), matching AuthHex's own `User.RoleId` being a single scalar FK, not a many-to-many.
 
 ## C.9 Modeling notes (load-bearing)
 - **Item types are a dropdown, not a relationship.** `ITEM_TYPE` (Color, Size, Material) exists **only** to populate the frontend item-builder's dropdown via `GET /item-types`. Nothing references it and it references nothing — there is no value table and no join to `ITEM`. The builder cross-products the checked types into **one standalone item per combination**; the chosen values (Red, S, M) are encoded by the **client** into the generated SKU (`BL-0002` for one type, `BL-100-0003` for two) and the server only checks that SKU for uniqueness. **The item list is the record of what was built.** This is not a product-variation model: there is no parent-product entity and no variant hierarchy.
   - *Accepted trade-off (a decision, not an oversight):* the backend cannot answer "list all blue items", cannot filter or report by colour/size, and cannot validate that a SKU's segments correspond to real item types. Renaming an item type (`Color` → `Colour`) does **not** touch existing SKUs, which keep their old segments — the two are permanently decoupled the moment an item is created. If value-level querying is ever needed, an `ITEM_TYPE_VALUE` table plus a link table can be added additively, but existing SKUs will not be back-fillable without parsing them by hand.
+- **Sale price is a per-item scalar, not a variant/price table.** Because each "variant" is its own `ITEM` row (above), the optional selling price lives directly on `ITEM.sale_price` (nullable). `NULL` means "use stock value" — Sales values the item at its FIFO stock cost at sale time (FR-STK-04 / `STOCK_LAYER`); a value is a fixed selling price. It is **Sales-only**: it never participates in GRN, FIFO layering, or the stock ledger, so receipt/costing behaviour is identical whether the item is fixed-priced or not. The create-time "fixed price vs use stock value" choice is a **frontend UX toggle** — the contract is simply the nullable column, and the item builder requires a price on every generated variant when the user picks fixed pricing.
 - **Two-level categories.** `CATEGORY` no longer self-nests; `SUBCATEGORY` is the single optional level below it. An item stores both FKs rather than pointing only at the deepest node, so the parent is never inferred or lost. A subcategory cannot be reparented (it would silently invalidate the category of every item referencing it) — deactivate and recreate instead.
 - **Product config is a singleton, and only two of its flags are enforceable.** `subcategories_enabled` / `brands_enabled` gate item writes (`CONFIG_DISABLED`, 422). `item_types_enabled` is **advisory only** — since items carry no item-type reference, there is nothing on a write to reject; the frontend honours it by hiding the builder's type section. Reads are never gated, so existing data stays readable after a flag is switched off.
 - **FIFO = two structures.** `STOCK_LAYER` answers valuation ("what's on hand and at what cost"); `STOCK_LEDGER` answers history ("what moved, when, by whom"). Layers are keyed per item **per warehouse**.
@@ -366,7 +374,7 @@ ROLE_PERMISSION(role_id FK→ROLE, permission_id FK→PERMISSION)
 - **In-transit + cost-preserving transfer.** `STOCK_TRANSFER` holds `src`/`dest` warehouse; dispatch consumes source layers into in-transit, receive creates the destination layer at the **inherited** source cost.
 - **FEFO ≠ FIFO.** FIFO governs *costing*; FEFO governs *physical picking* of perishables via `BATCH.expiry_date`.
 - **External IdP + shadow user.** Authentication is delegated to **AuthHex** (RS256, issuer `AuthHex`/audience `AuthHexClient`, static public key). `USER` is a **local shadow** of AuthHex identities: `auth_user_id` (GUID from the token's `UserId` claim) is JIT-mapped to the local `int` `user_id` that every `created_by`/`requested_by`/`AUDIT_LOG.user_id`/`STOCK_LEDGER.user_id` FK references — no FK type change. A door policy admits only ERP `UserType`/`Role` holders.
-- **Reserved RBAC.** Role/Permission/UserRole/RolePermission exist for schema-completeness only; only `USER` is live (audit stamp). AuthHex's `RoleCode`/`UserTypeCode` claims drive the door gate today; per-endpoint RBAC is future work.
+- **RBAC — sidebar visibility, not endpoint enforcement (2026-07-18).** `Role`/`NavItem`/`SubNavItem`/`Permission`/`RolePermission` are now live tables backing Role CRUD (`RolesController`) and a permission-assignment UI. AuthHex remains the source of truth for `Role` identity (Guid PK, referenced by its JWT `RoleId`/`RoleCode` claims); ERPCore's `Role` is a **local shadow synced on write** — `RolesController` calls AuthHex's new `/api/role` functions first, then mirrors the result into the local int-keyed row (`auth_role_id` maps the two), exactly like `USER`/`auth_user_id`. `GET /api/v1/auth/me` resolves the caller's `RoleCode` claim to its local `Role`, joins `RolePermission`, and returns the permitted `NavItem`/`SubNavItem` codes for the frontend to filter its sidebar by. **This is deliberately UI-only**: no endpoint in this API (including the new Role/User/Nav ones) gained an authorization check from this work — AR-01 in `02-SECURITY.md` is unchanged, and per-endpoint RBAC remains future work (Part D there).
 - **Reorder alerts are a query**, not an entity — computed from `ITEM_REORDER` vs available. Add a table only if alert history is required.
 
 ## C.10 Entity → implementation mapping

docs/11-BACKEND-PHASE1.md

@@ -111,8 +111,61 @@ Request/response field shapes match AuthHex's own payloads one-for-one (project-
 session-issuing responses omit `AccessToken`/`RefreshToken` (cookie-delivered instead) and `refreshToken` is read from the
 `erp_rt` cookie rather than the request body.
 
+### 2.0.1 RBAC — Roles, sidebar nav, Users (added 2026-07-18; sidebar-visibility only, see docs/10 C.8)
+
+`GET /api/v1/auth/me` — the frontend's authoritative source for the current session's role and permitted sidebar sections
+(replaces the previous client-only `roleId` cached in localStorage). No payload.
+**200 OK**
+```json
+{ "roleCode": "ADMIN", "roleName": "Administrator", "navCodes": ["dashboard", "products", "products.item", "settings.roles", "..."] }
+```
+
+`GET /api/v1/nav` — read-only sidebar tree (`NavItem` + nested `SubNavItem`), seeded to mirror the frontend's hardcoded
+sidebar (`components/Layouts/AppSidebar.tsx`); used to render the Role permission-assignment checkbox UI. Not admin-editable
+in this phase.
+
+**Roles** (`RolesController`) — `Role` is a **local shadow of AuthHex's Role** (same pattern as `USER`/`auth_user_id`,
+docs/10 C.9): every write below forwards to AuthHex's new `/api/role` functions first, then mirrors the result locally.
+| Route | Notes |
+|---|---|
+| `GET /roles` | Paged list; `q`, `status` filters. |
+| `GET /roles/{roleId}` | `ETag` header for `If-Match` on update. |
+| `POST /roles` | `{ code, name }` → `201`, forwards to AuthHex `createRole`. |
+| `PUT /roles/{roleId}` | Requires `If-Match`; forwards to AuthHex `updateRole`. |
+| `PATCH /roles/{roleId}/status` | `{ status }` → `204`. |
+| `DELETE /roles/{roleId}` | Forwards to AuthHex `deleteRole`; `409 ROLE_IN_USE` if any user still holds it. |
+| `GET /roles/{roleId}/permissions` | `{ roleId, navItemIds, subNavItemIds }`. |
+| `PUT /roles/{roleId}/permissions` | Replaces the role's full permission set from `{ navItemIds, subNavItemIds }` — purely local, no AuthHex call. |
+
+> **`code` is server-accepted but frontend-derived, never hand-typed (2026-07-18).** The Roles UI computes `code` from
+> `name` (uppercased, non-alphanumeric → `_`) and submits it read-only; the field stays free-form here for API callers,
+> but no UI lets an operator type or edit it directly, on create or later. The Create Role dialog also now includes the
+> permission checkbox tree, so `POST /roles` and `PUT /roles/{roleId}/permissions` fire as one user action.
+>
+> **Bug fixed (2026-07-18): `POST /roles`/`PUT /roles/{roleId}` 500ing via `AUTH_UPSTREAM_ERROR`.** `IsSystemRole` being
+> omitted serialized as JSON `null`, and AuthHex's `createRole`/`updateRole` called `JsonElement.GetBoolean()` on it
+> unconditionally when the key was present — which throws on `null` (unlike `GetString()`, which tolerates it). Fixed on
+> both sides: AuthHex now checks `ValueKind != JsonValueKind.Null` before reading `isSystemRole`, and ERPCore's
+> `AuthHexClient` now serializes with `JsonIgnoreCondition.WhenWritingNull` so unset nullable fields are omitted from the
+> payload entirely rather than sent as explicit nulls — closing this class of bug for any other nullable field sent to AuthHex.
+
+**Users** (`UsersController`) — manages the local shadow `User` table and orchestrates account creation in AuthHex.
+| Route | Notes |
+|---|---|
+| `GET /users` | Paged list, joined with `Role`. |
+| `GET /users/{userId}` | Single record. |
+| `POST /users` | Creates the account in **both** backends: calls AuthHex's `registerUser` (which persists the password and emails it to the given `email`), then immediately mirrors the local shadow `User` row (rather than waiting for next-login JIT provisioning). Body: `{ username, fullName, roleId, userTypeId, email, nic?, mobileNumber?, password? }` (`password` empty ⇒ AuthHex auto-generates one). |
+| `PUT /users/{userId}/role` | `{ roleId }` — local role reassignment only; status/lock changes reuse the existing `/auth/status` and `/auth/lock` proxy endpoints. |
+| `GET /users/user-types` | Added 2026-07-18. Proxies AuthHex's new `listUserTypes` — `[{ userTypeId, code, description }]`. Populates the Create User form's UserType select so operators pick from a real list instead of typing an AuthHex GUID by hand; defaults to the sole existing type when only one exists. |
+
+> **Known gap, not fixed (flagged 2026-07-18):** AuthHex's `loginUser` resolves `identifier` against `Email`/`MobileNumber`/`Nic`
+> only — **not** `Username` (`UserManageRepository.GetUserByIdentifierAndType`). A user created via `POST /users` can log in
+> with their email but not their username. Out of scope for this change; revisit if/when asked.
+
 ### 2.1 Items
 > **`itemType` → `stockNature` (2026-07-16).** The Stocked/NonStocked/Service field was renamed so the name `itemType` could be taken by the new Item Type master (§2.7) — an unrelated concept. Items gained `subCategoryId` and `brandId` (both nullable). Items carry **no** item-type reference: the values chosen in the builder are encoded into the client-generated SKU (docs/10 Part C.9).
+>
+> **`salePrice` added (nullable, 2026-07-22).** Every item body below carries `salePrice` (`number|null`). It is the **Sales-only** fixed selling price: `null` ⇒ the item is sold at its stock/FIFO value; a value ⇒ fixed price. It never affects GRN/FIFO/ledger. On write it is optional; when supplied it must be `>= 0` (else `400` validation). The item builder's "fixed price / use stock value" toggle is UI-only — the contract is just the nullable field.
 
 #### `GET /items`
 Query: `q`, `status` (`Active|Inactive`), `categoryId`, `subCategoryId`, `brandId`, `trackingMode` (`None|Batch|Serial`), + paging.
@@ -120,7 +173,8 @@ Query: `q`, `status` (`Active|Inactive`), `categoryId`, `subCategoryId`, `brandI
 ```json
 { "items": [ { "itemId": 1001, "sku": "ITM-1001", "name": "Steel Bolt M8x40",
       "categoryId": 12, "subCategoryId": 30, "brandId": 2, "baseUomId": 1, "defaultVendorId": 5,
-      "stockNature": "Stocked", "trackingMode": "Batch", "taxClass": "STD", "status": "Active" } ],
+      "stockNature": "Stocked", "trackingMode": "Batch", "taxClass": "STD",
+      "salePrice": 12.5000, "status": "Active" } ],
   "pagination": { "page": 1, "pageSize": 20, "totalItems": 1, "totalPages": 1 } }
 ```
 
@@ -130,7 +184,8 @@ Query: `q`, `status` (`Active|Inactive`), `categoryId`, `subCategoryId`, `brandI
   "description": "Grade 8.8 zinc-plated hex bolt", "categoryId": 12, "subCategoryId": 30,
   "brandId": 2, "baseUomId": 1,
   "defaultVendorId": 5, "stockNature": "Stocked", "trackingMode": "Batch", "taxClass": "STD",
-  "status": "Active", "reorder": [ { "warehouseId": 1, "reorderPoint": 500, "reorderQty": 2000 } ],
+  "salePrice": 12.5000, "status": "Active",
+  "reorder": [ { "warehouseId": 1, "reorderPoint": 500, "reorderQty": 2000 } ],
   "conversions": [ { "conversionId": 33, "fromUom": 7, "toUom": 1, "factor": 12 } ],
   "createdAt": "2026-06-01T08:00:00Z", "updatedAt": "2026-07-01T10:15:00Z" }
 ```
@@ -141,14 +196,14 @@ The `sku` is **generated by the client** (it encodes the chosen item-type values
 ```json
 { "sku": "ITM-1002", "name": "Steel Nut M8", "description": "Grade 8 zinc-plated hex nut",
   "categoryId": 12, "subCategoryId": 30, "brandId": 2, "baseUomId": 1, "defaultVendorId": 5,
-  "stockNature": "Stocked", "trackingMode": "None", "taxClass": "STD" }
+  "stockNature": "Stocked", "trackingMode": "None", "taxClass": "STD", "salePrice": 3.2500 }
 ```
 **201 Created** — `Location: /api/v1/items/1002`
 ```json
 { "itemId": 1002, "sku": "ITM-1002", "name": "Steel Nut M8", "categoryId": 12,
   "subCategoryId": 30, "brandId": 2, "baseUomId": 1,
   "defaultVendorId": 5, "stockNature": "Stocked", "trackingMode": "None", "taxClass": "STD",
-  "status": "Active", "createdAt": "2026-07-07T09:30:00Z" }
+  "salePrice": 3.2500, "status": "Active", "createdAt": "2026-07-07T09:30:00Z" }
 ```
 `400` → `code: SKU_DUPLICATE` if SKU exists.
 `422` → `code: CONFIG_DISABLED` if `subCategoryId` is sent while subcategories are disabled, or `brandId` while brands are disabled (§2.8).
@@ -406,14 +461,15 @@ Query: `q`, `status` (`Open|Closed`), + paging. → list envelope of
 `GET /rfqs/{rfqId}/comparison` → vendor-by-line price matrix.
 
 ### 3.3 Purchase Orders
-> **Phase 1:** `approvalRequired` defaults `false` → PO **auto-approved on creation**. Approve endpoint exists but is a no-op unless enabled (FR-PROC-04). PO **freely editable while open** (Option B, FR-PROC-05).
+> **Phase 1:** `approvalRequired` defaults `false`. Create takes **`saveAsDraft`** (default `false` → **auto-approved on creation**; `true` → `Draft`). Approve endpoint exists but is a no-op unless enabled (FR-PROC-04). **A PO is editable/deletable only while `Draft`; submitting locks it** (FR-PROC-05, revised 2026-07-20 — Option B "freely edit while open" superseded).
 
 #### `POST /purchase-orders`
 ```json
-{ "vendorId": 5, "requisitionId": 210,
+{ "vendorId": 5, "requisitionId": 210, "saveAsDraft": false,
   "lines": [ { "itemId": 1001, "uomId": 1, "warehouseId": 1, "qty": 5000, "unitPrice": 12.50, "tax": 0.18 },
              { "itemId": 1002, "uomId": 1, "warehouseId": 1, "qty": 8000, "unitPrice": 6.20, "tax": 0.18 } ] }
 ```
+`saveAsDraft` optional (default `false`). When `true` the response `status` is `Draft`.
 **201 Created** — `Location: /api/v1/purchase-orders/342`
 ```json
 { "poId": 342, "docNo": "PO-2026-00342", "vendorId": 5, "requisitionId": 210,
@@ -426,7 +482,11 @@ Query: `q`, `status` (`Open|Closed`), + paging. → list envelope of
 `GET /purchase-orders?status=Approved&vendorId=5` → list envelope of PO summaries.
 
 #### `PUT /purchase-orders/{poId}`
-Edit while open (not FullyReceived/Closed/Cancelled); requires `If-Match`. → **200 OK** updated resource; `409 PO_NOT_EDITABLE` if closed.
+Edit a **Draft only**; requires `If-Match`. → **200 OK** updated resource; `409 PO_NOT_EDITABLE` once submitted (any non-Draft status).
+
+#### `POST /purchase-orders/{poId}/submit` → **200 OK** — `Draft → Approved`. `409 PO_NOT_EDITABLE` if not Draft.
+
+#### `DELETE /purchase-orders/{poId}` → **204 No Content** — permitted **only while Draft**; `409 PO_NOT_EDITABLE` once submitted.
 
 #### `POST /purchase-orders/{poId}/approve` → **200 OK** (no-op in Phase 1; transitions PendingApproval→Approved when enabled).
 
@@ -473,15 +533,31 @@ Against a PO (lines default from open PO lines) or direct (`poId: null`, by perm
 ```json
 { "poId": 342, "warehouseId": 1,
   "lines": [ { "poLineId": 900, "itemId": 1001, "uomId": 1, "binId": 45, "qty": 5000,
-      "unitCost": 12.50, "holdStatus": "OnHold",
-      "batch": { "batchNo": "B-2607", "expiryDate": "2028-07-01" } } ] }
+      "unitCost": 12.50, "discountPct": 10, "vatPct": 18, "holdStatus": "OnHold",
+      "batch": { "batchNo": "B-2607", "expiryDate": "2028-07-01" } },
+    { "poLineId": null, "itemId": 1050, "uomId": 1, "qty": 20,
+      "unitCost": 8.00, "holdStatus": "Available" } ] }
 ```
-**201 Created** — status `Draft`
+`discountPct`/`vatPct` optional (default 0, range 0–100). `unitCost` on a **PO line** is an optional
+override: 0/omitted uses the PO price; a value wins and a variance is recorded (02-SECURITY C.3, revised).
+On a direct receipt `unitCost` is required.
+**Off-PO lines (`poLineId: null`) are allowed even on a PO-based GRN** (2026-07-22, FR-GRN-01) — the second
+line above receives an item that is not on the PO. Such a line behaves exactly like a direct-receipt line:
+`unitCost` is required, `OVER_RECEIPT_TOLERANCE` does **not** apply (there is no PO qty to check), and no PO
+line balance is touched. The inline "create new item" UI simply calls `POST /items` (§2.1) first, then adds
+the returned item as an off-PO line.
+**201 Created** — status `Draft`. All derived figures are **server-computed**:
+`netUnitCost = unitCost × (1 − discountPct/100)`, `receivedValue = qty × netUnitCost` (after discount,
+**before** VAT — this is the stock value), `vatAmount = receivedValue × vatPct/100`,
+`lineTotal = receivedValue + vatAmount`, `priceVariance = (unitCost − poUnitPrice) × qty`.
 ```json
 { "grnId": 780, "docNo": "GRN-2026-00780", "poId": 342, "vendorId": 5, "warehouseId": 1,
   "status": "Draft", "createdBy": 17,
   "lines": [ { "grnLineId": 1300, "poLineId": 900, "itemId": 1001, "uomId": 1, "binId": 45,
-      "qty": 5000, "unitCost": 12.50, "receivedValue": 62500.00, "holdStatus": "OnHold", "batchId": 410 } ] }
+      "qty": 5000, "unitCost": 12.50, "poUnitPrice": 12.50, "discountPct": 10.0,
+      "netUnitCost": 11.25, "vatPct": 18.0, "vatAmount": 10125.00,
+      "receivedValue": 56250.00, "lineTotal": 66375.00, "priceVariance": 0.00,
+      "holdStatus": "OnHold", "batchId": 410 } ] }
 ```
 `422 OVER_RECEIPT_TOLERANCE` if qty exceeds open PO qty beyond tolerance.
 

docs/20-FRONTEND.md

@@ -28,7 +28,9 @@ Principles:
 
 ## 2. User flows
 
-The flow below is the end-to-end Phase-1 journey: replenishment need → procurement → receiving → QC hold → stock available → stock operations, with the reorder loop closing back. Colour = functional role (roles are conceptual; RBAC is not enforced in Phase 1).
+The flow below is the end-to-end Phase-1 journey: replenishment need → procurement → receiving → QC hold → stock available → stock operations, with the reorder loop closing back. Colour = functional role. Roles now drive real sidebar visibility (`GET /auth/me`'s `navCodes`, see docs/10 C.8/docs/11 §2.0.1, admin screens at `/dashboard/settings/roles` and `/dashboard/settings/users`) but **per-endpoint RBAC is still not enforced** — this remains a UI-level filter only.
+
+> **Roles screen (2026-07-18):** `code` is never typed by an operator — it's derived client-side from `name` (uppercased, non-alphanumeric → `_`) and shown read-only, on both create and edit. The Create Role dialog also includes the permission checkbox tree (`components/auth/RolePermissionTree.tsx`, fed by `GET /nav`), so creating a role and assigning its sidebar permissions is one Save action; the detail page (`/dashboard/settings/roles/[id]`) remains for later edits. The Create User dialog's "User type" is a `<Select>` populated from `GET /users/user-types` (proxying AuthHex's `listUserTypes`), defaulting to the sole existing type — operators never type an AuthHex UserType GUID by hand.
 
 ```mermaid
 flowchart TD
@@ -141,9 +143,11 @@ Vendors, Items, Categories, Subcategories, UOM, Warehouses, Brands, and Item Typ
 - **SKU generation stays client-side** (`buildVariantSku`) and is the *only* record of which colour/size an item is; the server only uniqueness-checks it. **Nothing can query items by colour** — accepted (`docs/10 Part C.9`).
 - **`remove()` → `updateStatus(id, "Inactive")`** everywhere. There are no `DELETE` endpoints on any master (FR-MD-08); the lists show a Status column and Deactivate/Activate.
 - **`initialQty` is gone** from the builder — the Item contract has no such field and there is no initial-receipt flow. Stock arrives via a GRN.
+- **Sale-price toggle on the builder (2026-07-22).** A "Fixed price / Use stock value" toggle sits on `/dashboard/products/new`. **Use stock value** (default) sends `salePrice: null` on every created item (sold at FIFO value). **Fixed price** reveals a top "fix value" input that pre-fills a per-variant `Sale price` column; each row is editable, and submit is blocked until **every** generated variant has a price `> 0`. The toggle is **frontend-only** — the contract is just the nullable `salePrice` field (`docs/11 §2.1`); it is Sales-only and never affects GRN/costing. The non-transactional create loop still applies — each variant's `salePrice` rides its own `POST /items`.
 - **Product Configuration** (`app/dashboard/products/settings`, `GET`/`PUT /product-config`) — only **3** of the original design's ~13 toggles exist. `subcategoriesEnabled`/`brandsEnabled` are server-enforced (`CONFIG_DISABLED`); **`itemTypesEnabled` is advisory** and this app is what honours it (it hides the builder's type section). The UI states that distinction on the screen rather than implying a guarantee.
 - **Non-transactional create loop:** the builder's per-row `itemsApi.create()` has no transaction — a `SKU_DUPLICATE` on row 7 of 12 leaves 6 items created. The error message now says how many landed rather than implying nothing happened. A transactional bulk-create endpoint would be the real fix.
 - **GRN edit/delete removed** — the API has no `PUT`/`DELETE` for a GRN; receipts are corrected by reversing documents (FR-X-05).
+- **GRN off-PO items + inline item create (2026-07-22).** On `/dashboard/receiving/grn/new`, "Add line" is available in **both** PO and direct mode — an added line in PO mode has `poLineId: null` and receives an item not on the PO (editable item/UOM dropdowns, `unitCost` required). A **"New item"** button opens `/dashboard/products/new` in a **new browser tab** (`window.open`, the first such pattern in the app), and a **refresh icon** re-pulls `GET /items?status=Active` so the newly created item is selectable **without** reloading the screen and losing the in-progress GRN. Server treats off-PO lines as direct receipts (no over-receipt check) — `docs/11 §4.1`.
 - **RFQ invited-vendors is not persisted** — `POST /rfqs` validates `vendorIds` then discards them, so the list/detail screens show quotations received instead of vendors invited.
 - **Known gap — serial numbers:** FR-GRN-04 requires capturing serials on receipt, but `CreateGrnLineInput` has no such field (only `batch`). The UI does not collect them rather than silently discarding them. Needs a backend change to honour the requirement.
 
@@ -157,7 +161,7 @@ Vendors, Items, Categories, Subcategories, UOM, Warehouses, Brands, and Item Typ
 **Client-side (UX only — safe to check locally):** purely input-level facts the browser already has.
 - Required fields present.
 - Format: SKU pattern, numeric fields numeric, date format, positive integers.
-- Range/bounds: `qty > 0`, `unitPrice >= 0`, `factor > 0`.
+- Range/bounds: `qty > 0`, `unitPrice >= 0`, `factor > 0`. Item `salePrice` is a client-supplied number — the builder requires `> 0` per variant in fixed mode; the server only checks `>= 0` on a supplied value (`docs/11 §2.1`).
 - Simple cross-field input rules: transfer `destWarehouseId != srcWarehouseId`.
 - Enum membership via constrained dropdowns (`stockNature` — ex-`itemType`, `trackingMode`, `countType`, `holdStatus`). Note the **Item Type** dropdown is *not* in this category: it's server data (`GET /item-types`), not an enum.