feat(e2e): add Playwright end-to-end tests for authentication, GRN, production, stock transfers, and adjustments

- Introduced Playwright configuration for e2e testing.
- Implemented authentication tests to validate login functionality.
- Created tests for GRN (Goods Receipt Note) to ensure proper stock handling.
- Developed production run tests to verify lifecycle and stock posting.
- Added stock transfer tests to check movement between warehouses.
- Implemented stock adjustment tests for positive and negative adjustments.
- Established API seeder for test data setup and verification.
- Enhanced utility functions for UI interactions and response handling.

.gitignore

@@ -30,6 +30,12 @@ yarn-error.log*
 Thumbs.db
 .idea/
 
+# ── Playwright E2E (Testing/e2e) ──────────────────────────────────────
+Testing/e2e/playwright-report/
+Testing/e2e/test-results/
+Testing/e2e/.auth/
+Testing/e2e/blob-report/
+
 # ── Migrations ─────────────────────────────────────────────────────────
 # Reverted 2026-07-31: excluding new EF Core migrations while
 # ErpDbContextModelSnapshot.cs stayed tracked meant every `dotnet ef

Backend/ERPCore/Controllers/BundleSalesController.cs

@@ -0,0 +1,79 @@
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Sales;
+using ERPCore.Services.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ERPCore.Controllers;
+
+[Route("api/v1/bundle-sales")]
+public sealed class BundleSalesController : ApiControllerBase
+{
+    private readonly IBundleSaleService _bundles;
+
+    public BundleSalesController(IBundleSaleService bundles) => _bundles = bundles;
+
+    [HttpGet("templates")]
+    [ProducesResponseType(typeof(PagedResponse<BundleSaleTemplateSummaryDto>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<PagedResponse<BundleSaleTemplateSummaryDto>>> ListTemplates(
+        [FromQuery] PageQuery query,
+        CancellationToken ct)
+        => Ok(await _bundles.ListTemplatesAsync(query, ct));
+
+    [HttpGet("templates/{bundleSaleTemplateId:int}")]
+    [ProducesResponseType(typeof(BundleSaleTemplateDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<BundleSaleTemplateDto>> GetTemplate(int bundleSaleTemplateId, CancellationToken ct)
+    {
+        var result = await _bundles.GetTemplateAsync(bundleSaleTemplateId, ct);
+        return result is null ? NotFound() : Ok(result);
+    }
+
+    [HttpGet]
+    [ProducesResponseType(typeof(PagedResponse<BundleSaleSummaryDto>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<PagedResponse<BundleSaleSummaryDto>>> List(
+        [FromQuery] PageQuery query,
+        [FromQuery] int? customerId,
+        [FromQuery] int? warehouseId,
+        CancellationToken ct)
+        => Ok(await _bundles.ListAsync(query, customerId, warehouseId, ct));
+
+    [HttpGet("{bundleSaleId:int}")]
+    [ProducesResponseType(typeof(BundleSaleDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<BundleSaleDto>> GetById(int bundleSaleId, CancellationToken ct)
+    {
+        var result = await _bundles.GetAsync(bundleSaleId, ct);
+        return result is null ? NotFound() : Ok(result);
+    }
+
+    [HttpGet("{bundleSaleId:int}/posting-check")]
+    [ProducesResponseType(typeof(BundleSalePostingCheckDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<BundleSalePostingCheckDto>> PostingCheck(int bundleSaleId, CancellationToken ct)
+        => Ok(await _bundles.CheckPostingAsync(bundleSaleId, ct));
+
+    [HttpPost]
+    [ProducesResponseType(typeof(BundleSaleDto), StatusCodes.Status201Created)]
+    public async Task<ActionResult<BundleSaleDto>> Create([FromBody] CreateBundleSaleRequest request, CancellationToken ct)
+    {
+        var result = await _bundles.CreateAsync(request, ct);
+        return Created($"/api/v1/bundle-sales/{result.BundleSaleId}", result);
+    }
+
+    [HttpPut("{bundleSaleId:int}")]
+    [ProducesResponseType(typeof(BundleSaleDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<BundleSaleDto>> Update(int bundleSaleId, [FromBody] UpdateBundleSaleRequest request, CancellationToken ct)
+    {
+        return Ok(await _bundles.UpdateAsync(bundleSaleId, request, ct));
+    }
+
+    [HttpPost("{bundleSaleId:int}/post")]
+    [ProducesResponseType(typeof(BundleSaleDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<BundleSaleDto>> Post(int bundleSaleId, CancellationToken ct)
+        => Ok(await _bundles.PostAsync(bundleSaleId, ct));
+
+    [HttpPost("{bundleSaleId:int}/cancel")]
+    [ProducesResponseType(typeof(BundleSaleDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<BundleSaleDto>> Cancel(int bundleSaleId, CancellationToken ct)
+        => Ok(await _bundles.CancelAsync(bundleSaleId, ct));
+}

Backend/ERPCore/Controllers/CustomersController.cs

@@ -0,0 +1,69 @@
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Customers;
+using ERPCore.Services.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ERPCore.Controllers;
+
+/// <summary>Customer master endpoints for Phase 1 sales.</summary>
+[Route("api/v1/customers")]
+public sealed class CustomersController : ApiControllerBase
+{
+    private readonly ICustomerService _customers;
+
+    public CustomersController(ICustomerService customers) => _customers = customers;
+
+    [HttpGet]
+    [ProducesResponseType(typeof(PagedResponse<CustomerDto>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<PagedResponse<CustomerDto>>> List(
+        [FromQuery] PageQuery query,
+        [FromQuery] EntityStatus? status,
+        [FromQuery] CustomerType? customerType,
+        CancellationToken ct)
+        => Ok(await _customers.ListAsync(query, status, customerType, ct));
+
+    [HttpGet("{customerId:int}")]
+    [ProducesResponseType(typeof(CustomerDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<CustomerDto>> GetById(int customerId, CancellationToken ct)
+    {
+        var result = await _customers.GetAsync(customerId, ct);
+        if (result is null) return NotFound();
+
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpPost]
+    [ProducesResponseType(typeof(CustomerDto), StatusCodes.Status201Created)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    public async Task<ActionResult<CustomerDto>> Create([FromBody] CreateCustomerRequest request, CancellationToken ct)
+    {
+        var result = await _customers.CreateAsync(request, ct);
+        SetETag(result.RowVersion);
+        return Created($"/api/v1/customers/{result.Value.CustomerId}", result.Value);
+    }
+
+    [HttpPut("{customerId:int}")]
+    [ProducesResponseType(typeof(CustomerDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    [ProducesResponseType(StatusCodes.Status412PreconditionFailed)]
+    public async Task<ActionResult<CustomerDto>> Update(int customerId, [FromBody] UpdateCustomerRequest request, CancellationToken ct)
+    {
+        var expected = RequireIfMatch();
+        var result = await _customers.UpdateAsync(customerId, request, expected, ct);
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpPatch("{customerId:int}/status")]
+    [ProducesResponseType(StatusCodes.Status204NoContent)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<IActionResult> SetStatus(int customerId, [FromBody] UpdateCustomerStatusRequest request, CancellationToken ct)
+    {
+        await _customers.SetStatusAsync(customerId, request.Status, ct);
+        return NoContent();
+    }
+}

Backend/ERPCore/Controllers/FreeIssuesController.cs

@@ -0,0 +1,78 @@
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Sales;
+using ERPCore.Services.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ERPCore.Controllers;
+
+/// <summary>
+/// Thin API alias for free-issue handling. Free issues are modeled as sales slips
+/// with line-level <c>IsFreeIssue</c>/<c>FreeQty</c> flags, so this controller reuses
+/// the existing sales-slip CRUD surface under a more business-friendly route.
+/// </summary>
+[Route("api/v1/free-issues")]
+public sealed class FreeIssuesController : ApiControllerBase
+{
+    private readonly ISalesSlipService _slips;
+
+    public FreeIssuesController(ISalesSlipService slips) => _slips = slips;
+
+    [HttpGet]
+    [ProducesResponseType(typeof(PagedResponse<FreeIssueSummaryDto>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<PagedResponse<FreeIssueSummaryDto>>> List(
+        [FromQuery] PageQuery query,
+        [FromQuery] SalesSlipStatus? status,
+        [FromQuery] int? customerId,
+        [FromQuery] int? warehouseId,
+        CancellationToken ct)
+        => Ok(await _slips.ListFreeIssuesAsync(query, status, customerId, warehouseId, ct));
+
+    [HttpGet("{freeIssueId:int}")]
+    [ProducesResponseType(typeof(FreeIssueDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<FreeIssueDto>> GetById(int freeIssueId, CancellationToken ct)
+    {
+        var result = await _slips.GetFreeIssueAsync(freeIssueId, ct);
+        if (result is null) return NotFound();
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpGet("{freeIssueId:int}/posting-check")]
+    [ProducesResponseType(typeof(SalesSlipPostingCheckDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<SalesSlipPostingCheckDto>> PostingCheck(int freeIssueId, CancellationToken ct)
+        => Ok(await _slips.CheckPostingAsync(freeIssueId, ct));
+
+    [HttpPost]
+    [ProducesResponseType(typeof(FreeIssueDto), StatusCodes.Status201Created)]
+    public async Task<ActionResult<FreeIssueDto>> Create([FromBody] CreateSalesSlipRequest request, CancellationToken ct)
+    {
+        var result = await _slips.CreateAsync(request, ct);
+        SetETag(result.RowVersion);
+        return Created($"/api/v1/free-issues/{result.Value.SalesSlipId}", result.Value);
+    }
+
+    [HttpPut("{freeIssueId:int}")]
+    [ProducesResponseType(typeof(FreeIssueDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status412PreconditionFailed)]
+    public async Task<ActionResult<FreeIssueDto>> Update(int freeIssueId, [FromBody] UpdateSalesSlipRequest request, CancellationToken ct)
+    {
+        var expected = RequireIfMatch();
+        var result = await _slips.UpdateAsync(freeIssueId, request, expected, ct);
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpPost("{freeIssueId:int}/post")]
+    [ProducesResponseType(typeof(FreeIssueDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<FreeIssueDto>> Post(int freeIssueId, CancellationToken ct)
+        => Ok(await _slips.PostAsync(freeIssueId, ct));
+
+    [HttpPost("{freeIssueId:int}/cancel")]
+    [ProducesResponseType(typeof(FreeIssueDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<FreeIssueDto>> Cancel(int freeIssueId, CancellationToken ct)
+        => Ok(await _slips.CancelAsync(freeIssueId, ct));
+}

Backend/ERPCore/Controllers/SalesInvoicesController.cs

@@ -0,0 +1,73 @@
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Sales;
+using ERPCore.Services.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ERPCore.Controllers;
+
+[Route("api/v1/sales-invoices")]
+public sealed class SalesInvoicesController : ApiControllerBase
+{
+    private readonly ISalesInvoiceService _invoices;
+
+    public SalesInvoicesController(ISalesInvoiceService invoices) => _invoices = invoices;
+
+    [HttpGet]
+    [ProducesResponseType(typeof(PagedResponse<SalesInvoiceSummaryDto>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<PagedResponse<SalesInvoiceSummaryDto>>> List(
+        [FromQuery] PageQuery query,
+        [FromQuery] SalesInvoiceStatus? status,
+        [FromQuery] int? customerId,
+        [FromQuery] int? warehouseId,
+        CancellationToken ct)
+        => Ok(await _invoices.ListAsync(query, status, customerId, warehouseId, ct));
+
+    [HttpGet("{salesInvoiceId:int}")]
+    [ProducesResponseType(typeof(SalesInvoiceDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<SalesInvoiceDto>> GetById(int salesInvoiceId, CancellationToken ct)
+    {
+        var result = await _invoices.GetAsync(salesInvoiceId, ct);
+        if (result is null) return NotFound();
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpGet("{salesInvoiceId:int}/posting-check")]
+    [ProducesResponseType(typeof(SalesInvoicePostingCheckDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<SalesInvoicePostingCheckDto>> PostingCheck(int salesInvoiceId, CancellationToken ct)
+        => Ok(await _invoices.CheckPostingAsync(salesInvoiceId, ct));
+
+    [HttpPost]
+    [ProducesResponseType(typeof(SalesInvoiceDto), StatusCodes.Status201Created)]
+    public async Task<ActionResult<SalesInvoiceDto>> Create([FromBody] CreateSalesInvoiceRequest request, CancellationToken ct)
+    {
+        var result = await _invoices.CreateAsync(request, ct);
+        SetETag(result.RowVersion);
+        return Created($"/api/v1/sales-invoices/{result.Value.SalesInvoiceId}", result.Value);
+    }
+
+    [HttpPut("{salesInvoiceId:int}")]
+    [ProducesResponseType(typeof(SalesInvoiceDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status412PreconditionFailed)]
+    public async Task<ActionResult<SalesInvoiceDto>> Update(int salesInvoiceId, [FromBody] UpdateSalesInvoiceRequest request, CancellationToken ct)
+    {
+        var expected = RequireIfMatch();
+        var result = await _invoices.UpdateAsync(salesInvoiceId, request, expected, ct);
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpPost("{salesInvoiceId:int}/post")]
+    [ProducesResponseType(typeof(SalesInvoiceDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<SalesInvoiceDto>> Post(int salesInvoiceId, CancellationToken ct)
+        => Ok(await _invoices.PostAsync(salesInvoiceId, ct));
+
+    [HttpPost("{salesInvoiceId:int}/cancel")]
+    [ProducesResponseType(typeof(SalesInvoiceDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<SalesInvoiceDto>> Cancel(int salesInvoiceId, CancellationToken ct)
+        => Ok(await _invoices.CancelAsync(salesInvoiceId, ct));
+}

Backend/ERPCore/Controllers/SalesReportsController.cs

@@ -0,0 +1,35 @@
+using ERPCore.Dtos.Sales;
+using ERPCore.Services.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ERPCore.Controllers;
+
+[Route("api/v1/reports/sales")]
+public sealed class SalesReportsController : ApiControllerBase
+{
+    private readonly ISalesReportService _reports;
+
+    public SalesReportsController(ISalesReportService reports) => _reports = reports;
+
+    [HttpGet]
+    [ProducesResponseType(typeof(IReadOnlyList<SalesReportDefinitionDto>), StatusCodes.Status200OK)]
+    public ActionResult<IReadOnlyList<SalesReportDefinitionDto>> ListReports()
+        => Ok(_reports.ListReports());
+
+    [HttpGet("{reportId}")]
+    [ProducesResponseType(typeof(SalesReportDefinitionDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public ActionResult<SalesReportDefinitionDto> GetReport(string reportId)
+    {
+        var report = _reports.GetReport(reportId);
+        return report is null ? NotFound() : Ok(report);
+    }
+
+    [HttpPost("query")]
+    [ProducesResponseType(typeof(SalesReportQueryResponse), StatusCodes.Status200OK)]
+    public async Task<ActionResult<SalesReportQueryResponse>> Query([FromBody] SalesReportQueryRequest request, CancellationToken ct)
+    {
+        var rows = await _reports.QueryAsync(request.ReportType, request.From, request.To, request.ItemId, request.CustomerId, request.WarehouseId, ct);
+        return Ok(new SalesReportQueryResponse(request.ReportType, request.From, request.To, rows));
+    }
+}

Backend/ERPCore/Controllers/SalesSlipPromotionsController.cs

@@ -0,0 +1,22 @@
+using ERPCore.Dtos.Sales;
+using ERPCore.Services.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ERPCore.Controllers;
+
+[Route("api/v1/sales-slips/{salesSlipId:int}/free-issue-suggestions")]
+public sealed class SalesSlipPromotionsController : ApiControllerBase
+{
+    private readonly ISalesPromotionSuggestionService _suggestions;
+
+    public SalesSlipPromotionsController(ISalesPromotionSuggestionService suggestions) => _suggestions = suggestions;
+
+    [HttpGet]
+    [ProducesResponseType(typeof(SalesFreeIssueSuggestionDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<SalesFreeIssueSuggestionDto>> Get(int salesSlipId, CancellationToken ct)
+    {
+        var result = await _suggestions.GetFreeIssueSuggestionsAsync(salesSlipId, ct);
+        return result is null ? NotFound() : Ok(result);
+    }
+}

Backend/ERPCore/Controllers/SalesSlipsController.cs

@@ -0,0 +1,73 @@
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Sales;
+using ERPCore.Services.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ERPCore.Controllers;
+
+[Route("api/v1/sales-slips")]
+public sealed class SalesSlipsController : ApiControllerBase
+{
+    private readonly ISalesSlipService _slips;
+
+    public SalesSlipsController(ISalesSlipService slips) => _slips = slips;
+
+    [HttpGet]
+    [ProducesResponseType(typeof(PagedResponse<SalesSlipSummaryDto>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<PagedResponse<SalesSlipSummaryDto>>> List(
+        [FromQuery] PageQuery query,
+        [FromQuery] SalesSlipStatus? status,
+        [FromQuery] int? customerId,
+        [FromQuery] int? warehouseId,
+        CancellationToken ct)
+        => Ok(await _slips.ListAsync(query, status, customerId, warehouseId, ct));
+
+    [HttpGet("{salesSlipId:int}")]
+    [ProducesResponseType(typeof(SalesSlipDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<SalesSlipDto>> GetById(int salesSlipId, CancellationToken ct)
+    {
+        var result = await _slips.GetAsync(salesSlipId, ct);
+        if (result is null) return NotFound();
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpGet("{salesSlipId:int}/posting-check")]
+    [ProducesResponseType(typeof(SalesSlipPostingCheckDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<SalesSlipPostingCheckDto>> PostingCheck(int salesSlipId, CancellationToken ct)
+        => Ok(await _slips.CheckPostingAsync(salesSlipId, ct));
+
+    [HttpPost]
+    [ProducesResponseType(typeof(SalesSlipDto), StatusCodes.Status201Created)]
+    public async Task<ActionResult<SalesSlipDto>> Create([FromBody] CreateSalesSlipRequest request, CancellationToken ct)
+    {
+        var result = await _slips.CreateAsync(request, ct);
+        SetETag(result.RowVersion);
+        return Created($"/api/v1/sales-slips/{result.Value.SalesSlipId}", result.Value);
+    }
+
+    [HttpPut("{salesSlipId:int}")]
+    [ProducesResponseType(typeof(SalesSlipDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status412PreconditionFailed)]
+    public async Task<ActionResult<SalesSlipDto>> Update(int salesSlipId, [FromBody] UpdateSalesSlipRequest request, CancellationToken ct)
+    {
+        var expected = RequireIfMatch();
+        var result = await _slips.UpdateAsync(salesSlipId, request, expected, ct);
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpPost("{salesSlipId:int}/post")]
+    [ProducesResponseType(typeof(SalesSlipDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<SalesSlipDto>> Post(int salesSlipId, CancellationToken ct)
+        => Ok(await _slips.PostAsync(salesSlipId, ct));
+
+    [HttpPost("{salesSlipId:int}/cancel")]
+    [ProducesResponseType(typeof(SalesSlipDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<SalesSlipDto>> Cancel(int salesSlipId, CancellationToken ct)
+        => Ok(await _slips.CancelAsync(salesSlipId, ct));
+}

Backend/ERPCore/Domain/DocumentTypes.cs

@@ -17,4 +17,7 @@ public static class DocumentTypes
 
     /// <summary>Production run (docs/30 FR-MFG-08) — <c>PRD-2026-00001</c>.</summary>
     public const string Production = "PRD";
+    public const string SalesInvoice = "SI";
+    public const string SalesSlip = "SSL";
+    public const string BundleSale = "BND";
 }

Backend/ERPCore/Domain/Entities/BundleSale.cs

@@ -0,0 +1,33 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+public class BundleSale
+{
+    public int BundleSaleId { get; set; }
+    public string BundleNo { get; set; } = string.Empty;
+    public DateTime BundleDate { get; set; }
+    public int CustomerId { get; set; }
+    public Customer? Customer { get; set; }
+    public string CustomerSnapshotName { get; set; } = string.Empty;
+    public int WarehouseId { get; set; }
+    public Warehouse? Warehouse { get; set; }
+    public int CashierUserId { get; set; }
+    public User? CashierUser { get; set; }
+    public int BundleSaleTemplateId { get; set; }
+    public BundleSaleTemplate? BundleSaleTemplate { get; set; }
+    public string BundleName { get; set; } = string.Empty;
+    public string BundleCode { get; set; } = string.Empty;
+    public BundleSaleStatus Status { get; set; } = BundleSaleStatus.Draft;
+    public decimal ComponentSubtotal { get; set; }
+    public decimal BundlePrice { get; set; }
+    public decimal MarginAmount { get; set; }
+    public decimal DiscountTotal { get; set; }
+    public decimal TaxTotal { get; set; }
+    public decimal GrandTotal { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime? UpdatedAt { get; set; }
+    public int ConcurrencyStamp { get; set; }
+
+    public ICollection<BundleSaleLine> Lines { get; set; } = new List<BundleSaleLine>();
+}

Backend/ERPCore/Domain/Entities/BundleSaleLine.cs

@@ -0,0 +1,24 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+public class BundleSaleLine
+{
+    public int BundleSaleLineId { get; set; }
+    public int BundleSaleId { get; set; }
+    public BundleSale? BundleSale { get; set; }
+
+    public int ItemId { get; set; }
+    public Item? Item { get; set; }
+    public string Description { get; set; } = string.Empty;
+    public decimal Qty { get; set; }
+    public int UomId { get; set; }
+    public Uom? Uom { get; set; }
+    public int WarehouseId { get; set; }
+    public Warehouse? Warehouse { get; set; }
+    public decimal UnitPrice { get; set; }
+    public decimal LineTotal { get; set; }
+    public bool IncludeInBundle { get; set; } = true;
+    public bool IsComponent { get; set; } = true;
+    public int? ParentLineId { get; set; }
+}

Backend/ERPCore/Domain/Entities/BundleSaleTemplate.cs

@@ -0,0 +1,17 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+public class BundleSaleTemplate
+{
+    public int BundleSaleTemplateId { get; set; }
+    public string TemplateCode { get; set; } = string.Empty;
+    public string TemplateName { get; set; } = string.Empty;
+    public string? Description { get; set; }
+    public EntityStatus Status { get; set; } = EntityStatus.Active;
+    public DateTime CreatedAt { get; set; }
+    public DateTime? UpdatedAt { get; set; }
+    public int ConcurrencyStamp { get; set; }
+
+    public ICollection<BundleSaleTemplateLine> Lines { get; set; } = new List<BundleSaleTemplateLine>();
+}

Backend/ERPCore/Domain/Entities/BundleSaleTemplateLine.cs

@@ -0,0 +1,20 @@
+namespace ERPCore.Domain.Entities;
+
+public class BundleSaleTemplateLine
+{
+    public int BundleSaleTemplateLineId { get; set; }
+    public int BundleSaleTemplateId { get; set; }
+    public BundleSaleTemplate? BundleSaleTemplate { get; set; }
+
+    public int ItemId { get; set; }
+    public Item? Item { get; set; }
+    public int UomId { get; set; }
+    public Uom? Uom { get; set; }
+    public int WarehouseId { get; set; }
+    public Warehouse? Warehouse { get; set; }
+
+    public decimal Qty { get; set; }
+    public decimal UnitPrice { get; set; }
+    public bool IncludeInBundle { get; set; } = true;
+    public int SortOrder { get; set; }
+}

Backend/ERPCore/Domain/Entities/Customer.cs

@@ -0,0 +1,38 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+/// <summary>
+/// Customer master for both B2B and B2C sales.
+/// Phase 1 keeps this lean: identity, contact, tax, credit, and default warehouse.
+/// </summary>
+public class Customer
+{
+    public int CustomerId { get; set; }
+    public string CustomerCode { get; set; } = string.Empty;
+    public CustomerType CustomerType { get; set; } = CustomerType.B2C;
+
+    public string Name { get; set; } = string.Empty;
+    public string? DisplayName { get; set; }
+    public string? Phone { get; set; }
+    public string? Email { get; set; }
+
+    public string? AddressLine1 { get; set; }
+    public string? AddressLine2 { get; set; }
+    public string? City { get; set; }
+    public string? Country { get; set; }
+
+    public string? TaxRegistrationNo { get; set; }
+    public decimal CreditLimit { get; set; }
+    public int CreditDays { get; set; }
+
+    public int? DefaultWarehouseId { get; set; }
+    public Warehouse? DefaultWarehouse { 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/SalesInvoice.cs

@@ -0,0 +1,41 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+public class SalesInvoice
+{
+    public int SalesInvoiceId { get; set; }
+    public string InvoiceNo { get; set; } = string.Empty;
+    public DateTime InvoiceDate { get; set; }
+
+    public int CustomerId { get; set; }
+    public Customer? Customer { get; set; }
+
+    public string CustomerSnapshotName { get; set; } = string.Empty;
+    public string? CustomerSnapshotTaxNo { get; set; }
+
+    public int WarehouseId { get; set; }
+    public Warehouse? Warehouse { get; set; }
+
+    public SalesInvoiceType InvoiceType { get; set; } = SalesInvoiceType.B2C;
+    public SalesInvoiceStatus Status { get; set; } = SalesInvoiceStatus.Draft;
+
+    public decimal Subtotal { get; set; }
+    public decimal DiscountTotal { get; set; }
+    public decimal TaxTotal { get; set; }
+    public decimal GrandTotal { get; set; }
+    public decimal RoundOff { get; set; }
+    public decimal NetPayable { get; set; }
+    public decimal PaidAmount { get; set; }
+    public decimal BalanceAmount { get; set; }
+
+    public int CreatedBy { get; set; }
+    public User? Creator { get; set; }
+
+    public DateTime CreatedAt { get; set; }
+    public DateTime? UpdatedAt { get; set; }
+
+    public uint RowVersion { get; set; }
+
+    public ICollection<SalesInvoiceLine> Lines { get; set; } = new List<SalesInvoiceLine>();
+}

Backend/ERPCore/Domain/Entities/SalesInvoiceLine.cs

@@ -0,0 +1,38 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+public class SalesInvoiceLine
+{
+    public int SalesInvoiceLineId { get; set; }
+
+    public int SalesInvoiceId { get; set; }
+    public SalesInvoice? SalesInvoice { get; set; }
+
+    public int ItemId { get; set; }
+    public Item? Item { get; set; }
+
+    public string Description { get; set; } = string.Empty;
+
+    public decimal Qty { get; set; }
+    public decimal FreeQty { get; set; }
+    public int UomId { get; set; }
+    public Uom? Uom { get; set; }
+    public int WarehouseId { get; set; }
+    public Warehouse? Warehouse { get; set; }
+
+    public decimal UnitPrice { get; set; }
+    public decimal BaseCost { get; set; }
+    public string PriceSource { get; set; } = string.Empty;
+    public SalesDiscountMode DiscountMode { get; set; } = SalesDiscountMode.Percentage;
+    public decimal DiscountPct { get; set; }
+    public decimal DiscountAmount { get; set; }
+    public decimal NetUnitPrice { get; set; }
+    public decimal LineTotal { get; set; }
+    public decimal TaxPct { get; set; }
+    public decimal TaxAmount { get; set; }
+    public bool IsFreeIssue { get; set; }
+    public int? ParentLineId { get; set; }
+
+    public uint RowVersion { get; set; }
+}

Backend/ERPCore/Domain/Entities/SalesSlip.cs

@@ -0,0 +1,36 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+public class SalesSlip
+{
+    public int SalesSlipId { get; set; }
+    public string SlipNo { get; set; } = string.Empty;
+    public DateTime SlipDate { get; set; }
+
+    public int CustomerId { get; set; }
+    public Customer? Customer { get; set; }
+
+    public string CustomerSnapshotName { get; set; } = string.Empty;
+    public int WarehouseId { get; set; }
+    public Warehouse? Warehouse { get; set; }
+
+    public int CashierUserId { get; set; }
+    public User? CashierUser { get; set; }
+
+    public SalesSlipStatus Status { get; set; } = SalesSlipStatus.Draft;
+
+    public decimal Subtotal { get; set; }
+    public decimal DiscountTotal { get; set; }
+    public decimal TaxTotal { get; set; }
+    public decimal GrandTotal { get; set; }
+    public decimal PaidAmount { get; set; }
+    public decimal BalanceAmount { get; set; }
+
+    public DateTime CreatedAt { get; set; }
+    public DateTime? UpdatedAt { get; set; }
+
+    public uint RowVersion { get; set; }
+
+    public ICollection<SalesSlipLine> Lines { get; set; } = new List<SalesSlipLine>();
+}

Backend/ERPCore/Domain/Entities/SalesSlipLine.cs

@@ -0,0 +1,38 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+public class SalesSlipLine
+{
+    public int SalesSlipLineId { get; set; }
+
+    public int SalesSlipId { get; set; }
+    public SalesSlip? SalesSlip { get; set; }
+
+    public int ItemId { get; set; }
+    public Item? Item { get; set; }
+
+    public string Description { get; set; } = string.Empty;
+
+    public decimal Qty { get; set; }
+    public decimal FreeQty { get; set; }
+    public int UomId { get; set; }
+    public Uom? Uom { get; set; }
+    public int WarehouseId { get; set; }
+    public Warehouse? Warehouse { get; set; }
+
+    public decimal UnitPrice { get; set; }
+    public decimal BaseCost { get; set; }
+    public string PriceSource { get; set; } = string.Empty;
+    public SalesDiscountMode DiscountMode { get; set; } = SalesDiscountMode.Percentage;
+    public decimal DiscountPct { get; set; }
+    public decimal DiscountAmount { get; set; }
+    public decimal NetUnitPrice { get; set; }
+    public decimal LineTotal { get; set; }
+    public decimal TaxPct { get; set; }
+    public decimal TaxAmount { get; set; }
+    public bool IsFreeIssue { get; set; }
+    public int? ParentLineId { get; set; }
+
+    public uint RowVersion { get; set; }
+}

Backend/ERPCore/Domain/Enums/BundleSaleStatus.cs

@@ -0,0 +1,8 @@
+namespace ERPCore.Domain.Enums;
+
+public enum BundleSaleStatus
+{
+    Draft = 0,
+    Posted = 1,
+    Cancelled = 2
+}

Backend/ERPCore/Domain/Enums/CustomerType.cs

@@ -0,0 +1,8 @@
+namespace ERPCore.Domain.Enums;
+
+public enum CustomerType
+{
+    B2B = 1,
+    B2C = 2,
+    WalkIn = 3
+}

Backend/ERPCore/Domain/Enums/SalesDiscountMode.cs

@@ -0,0 +1,7 @@
+namespace ERPCore.Domain.Enums;
+
+public enum SalesDiscountMode
+{
+    Percentage = 1,
+    Amount = 2
+}

Backend/ERPCore/Domain/Enums/SalesInvoiceStatus.cs

@@ -0,0 +1,8 @@
+namespace ERPCore.Domain.Enums;
+
+public enum SalesInvoiceStatus
+{
+    Draft = 1,
+    Posted = 2,
+    Cancelled = 3
+}

Backend/ERPCore/Domain/Enums/SalesInvoiceType.cs

@@ -0,0 +1,9 @@
+namespace ERPCore.Domain.Enums;
+
+public enum SalesInvoiceType
+{
+    B2B = 1,
+    B2C = 2,
+    Cash = 3,
+    Credit = 4
+}

Backend/ERPCore/Domain/Enums/SalesSlipStatus.cs

@@ -0,0 +1,8 @@
+namespace ERPCore.Domain.Enums;
+
+public enum SalesSlipStatus
+{
+    Draft = 1,
+    Posted = 2,
+    Cancelled = 3
+}

Backend/ERPCore/Dtos/Customers/CustomerDtos.cs

@@ -0,0 +1,66 @@
+using System.ComponentModel.DataAnnotations;
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Dtos.Customers;
+
+/// <summary>Customer resource used by sales documents.</summary>
+public sealed record CustomerDto(
+    int CustomerId,
+    string CustomerCode,
+    CustomerType CustomerType,
+    string Name,
+    string? DisplayName,
+    string? Phone,
+    string? Email,
+    string? AddressLine1,
+    string? AddressLine2,
+    string? City,
+    string? Country,
+    string? TaxRegistrationNo,
+    decimal CreditLimit,
+    int CreditDays,
+    int? DefaultWarehouseId,
+    EntityStatus Status,
+    DateTime CreatedAt,
+    DateTime? UpdatedAt);
+
+public sealed class CreateCustomerRequest
+{
+    [Required, StringLength(50)] public string CustomerCode { get; set; } = string.Empty;
+    [Required, EnumDataType(typeof(CustomerType))] public CustomerType CustomerType { get; set; } = CustomerType.B2C;
+    [Required, StringLength(200)] public string Name { get; set; } = string.Empty;
+    [StringLength(200)] public string? DisplayName { get; set; }
+    [StringLength(30)] public string? Phone { get; set; }
+    [StringLength(100)] public string? Email { get; set; }
+    [StringLength(250)] public string? AddressLine1 { get; set; }
+    [StringLength(250)] public string? AddressLine2 { get; set; }
+    [StringLength(100)] public string? City { get; set; }
+    [StringLength(100)] public string? Country { get; set; }
+    [StringLength(50)] public string? TaxRegistrationNo { get; set; }
+    [Range(0, double.MaxValue)] public decimal CreditLimit { get; set; }
+    [Range(0, int.MaxValue)] public int CreditDays { get; set; }
+    public int? DefaultWarehouseId { get; set; }
+}
+
+public sealed class UpdateCustomerRequest
+{
+    [Required, StringLength(50)] public string CustomerCode { get; set; } = string.Empty;
+    [Required, EnumDataType(typeof(CustomerType))] public CustomerType CustomerType { get; set; } = CustomerType.B2C;
+    [Required, StringLength(200)] public string Name { get; set; } = string.Empty;
+    [StringLength(200)] public string? DisplayName { get; set; }
+    [StringLength(30)] public string? Phone { get; set; }
+    [StringLength(100)] public string? Email { get; set; }
+    [StringLength(250)] public string? AddressLine1 { get; set; }
+    [StringLength(250)] public string? AddressLine2 { get; set; }
+    [StringLength(100)] public string? City { get; set; }
+    [StringLength(100)] public string? Country { get; set; }
+    [StringLength(50)] public string? TaxRegistrationNo { get; set; }
+    [Range(0, double.MaxValue)] public decimal CreditLimit { get; set; }
+    [Range(0, int.MaxValue)] public int CreditDays { get; set; }
+    public int? DefaultWarehouseId { get; set; }
+}
+
+public sealed class UpdateCustomerStatusRequest
+{
+    [Required, EnumDataType(typeof(EntityStatus))] public EntityStatus Status { get; set; }
+}

Backend/ERPCore/Dtos/Sales/BundleSaleDtos.cs

@@ -0,0 +1,83 @@
+using System.ComponentModel.DataAnnotations;
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Dtos.Sales;
+
+public sealed record BundleSaleLineDto(
+    int BundleSaleLineId, int ItemId, string Description, decimal Qty, int UomId, int WarehouseId,
+    decimal UnitPrice, decimal LineTotal, bool IncludeInBundle, bool IsComponent, int? ParentLineId);
+
+public sealed record BundleSaleDto(
+    int BundleSaleId, string BundleNo, DateTime BundleDate, int CustomerId, string CustomerSnapshotName,
+    int WarehouseId, int CashierUserId, int BundleSaleTemplateId, string BundleName, string BundleCode,
+    BundleSaleStatus Status, decimal ComponentSubtotal, decimal BundlePrice, decimal MarginAmount,
+    decimal DiscountTotal, decimal TaxTotal, decimal GrandTotal, DateTime CreatedAt, DateTime? UpdatedAt,
+    IReadOnlyList<BundleSaleLineDto> Lines);
+
+public sealed record BundleSaleSummaryDto(
+    int BundleSaleId, string BundleNo, DateTime BundleDate, int CustomerId, string CustomerSnapshotName,
+    int WarehouseId, string BundleName, string BundleCode, BundleSaleStatus Status,
+    decimal ComponentSubtotal, decimal BundlePrice, decimal GrandTotal, DateTime CreatedAt);
+
+public sealed record BundleSaleTemplateLineDto(
+    int BundleSaleTemplateLineId, int ItemId, int UomId, int WarehouseId, decimal Qty,
+    decimal UnitPrice, bool IncludeInBundle, int SortOrder);
+
+public sealed record BundleSaleTemplateDto(
+    int BundleSaleTemplateId, string TemplateCode, string TemplateName, string? Description,
+    EntityStatus Status, DateTime CreatedAt, DateTime? UpdatedAt, IReadOnlyList<BundleSaleTemplateLineDto> Lines);
+
+public sealed record BundleSaleTemplateSummaryDto(
+    int BundleSaleTemplateId, string TemplateCode, string TemplateName, string? Description,
+    EntityStatus Status, int LineCount, DateTime CreatedAt, DateTime? UpdatedAt);
+
+public sealed record BundleSalePostingIssueDto(
+    int BundleSaleLineId, int ItemId, string ItemSku, string ItemName, int WarehouseId,
+    decimal RequestedQty, decimal AvailableQty, decimal ShortQty);
+
+public sealed record BundleSalePostingCheckDto(
+    int BundleSaleId, string BundleNo, BundleSaleStatus Status, bool CanPost,
+    IReadOnlyList<BundleSalePostingIssueDto> Issues);
+
+public sealed class CreateBundleSaleTemplateLineRequest
+{
+    [Required] public int ItemId { get; set; }
+    [Required] public int UomId { get; set; }
+    [Required] public int WarehouseId { get; set; }
+    [Range(0.0001, double.MaxValue)] public decimal Qty { get; set; }
+    [Range(0, double.MaxValue)] public decimal UnitPrice { get; set; }
+    public bool IncludeInBundle { get; set; } = true;
+    public int SortOrder { get; set; }
+}
+
+public sealed class CreateBundleSaleTemplateRequest
+{
+    [Required] public string TemplateCode { get; set; } = string.Empty;
+    [Required] public string TemplateName { get; set; } = string.Empty;
+    public string? Description { get; set; }
+    [Required, MinLength(1)] public List<CreateBundleSaleTemplateLineRequest> Lines { get; set; } = new();
+}
+
+public sealed class CreateBundleSaleRequest
+{
+    [Required] public int CustomerId { get; set; }
+    [Required] public int WarehouseId { get; set; }
+    [Required] public int CashierUserId { get; set; }
+    [Required] public int BundleSaleTemplateId { get; set; }
+    [Required] public string BundleName { get; set; } = string.Empty;
+    [Range(0, double.MaxValue)] public decimal BundlePrice { get; set; }
+    public bool AllowPriceOverride { get; set; }
+    [Required, MinLength(1)] public List<CreateBundleSaleTemplateLineRequest> Lines { get; set; } = new();
+}
+
+public sealed class UpdateBundleSaleRequest
+{
+    [Required] public int CustomerId { get; set; }
+    [Required] public int WarehouseId { get; set; }
+    [Required] public int CashierUserId { get; set; }
+    [Required] public int BundleSaleTemplateId { get; set; }
+    [Required] public string BundleName { get; set; } = string.Empty;
+    [Range(0, double.MaxValue)] public decimal BundlePrice { get; set; }
+    public bool AllowPriceOverride { get; set; }
+    [Required, MinLength(1)] public List<CreateBundleSaleTemplateLineRequest> Lines { get; set; } = new();
+}

Backend/ERPCore/Dtos/Sales/SalesInvoiceDtos.cs

@@ -0,0 +1,67 @@
+using System.ComponentModel.DataAnnotations;
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Dtos.Sales;
+
+public sealed record SalesInvoiceLineDto(
+    int SalesInvoiceLineId, int ItemId, string Description, decimal Qty, decimal FreeQty, int UomId,
+    int WarehouseId, decimal UnitPrice, decimal BaseCost, string PriceSource, decimal DiscountPct,
+    decimal DiscountAmount, SalesDiscountMode DiscountMode, decimal NetUnitPrice, decimal LineTotal,
+    decimal TaxPct, decimal TaxAmount, bool IsFreeIssue, int? ParentLineId);
+
+public sealed record SalesInvoiceTotalsDto(
+    decimal Subtotal, decimal DiscountTotal, decimal FreeQtyTotal, decimal TaxTotal, decimal GrandTotal,
+    decimal RoundOff, decimal NetPayable, decimal PaidAmount, decimal BalanceAmount);
+
+public sealed record SalesInvoiceDto(
+    int SalesInvoiceId, string InvoiceNo, DateTime InvoiceDate, int CustomerId,
+    string CustomerSnapshotName, string? CustomerSnapshotTaxNo, int WarehouseId,
+    SalesInvoiceType InvoiceType, SalesInvoiceStatus Status, int CreatedBy, DateTime CreatedAt,
+    DateTime? UpdatedAt, SalesInvoiceTotalsDto Totals, IReadOnlyList<SalesInvoiceLineDto> Lines);
+
+public sealed record SalesInvoiceSummaryDto(
+    int SalesInvoiceId, string InvoiceNo, DateTime InvoiceDate, int CustomerId,
+    string CustomerSnapshotName, int WarehouseId, SalesInvoiceType InvoiceType,
+    SalesInvoiceStatus Status, SalesInvoiceTotalsDto Totals, DateTime CreatedAt);
+
+public sealed record SalesInvoicePostingIssueDto(
+    int SalesInvoiceLineId, int ItemId, string ItemSku, string ItemName, int WarehouseId,
+    decimal RequestedQty, decimal AvailableQty, decimal ShortQty, bool IsFreeIssue);
+
+public sealed record SalesInvoicePostingCheckDto(
+    int SalesInvoiceId, string InvoiceNo, SalesInvoiceStatus Status, bool CanPost,
+    IReadOnlyList<SalesInvoicePostingIssueDto> Issues);
+
+public sealed class CreateSalesInvoiceLineRequest
+{
+    [Required] public int ItemId { get; set; }
+    [Required] public int UomId { get; set; }
+    [Required] public int WarehouseId { get; set; }
+    [Range(0.0001, double.MaxValue)] public decimal Qty { get; set; }
+    [Range(0, double.MaxValue)] public decimal FreeQty { get; set; }
+    [Range(0, double.MaxValue)] public decimal? UnitPrice { get; set; }
+    public bool AllowManualPriceOverride { get; set; }
+    [Required, EnumDataType(typeof(SalesDiscountMode))] public SalesDiscountMode DiscountMode { get; set; } = SalesDiscountMode.Percentage;
+    [Range(0, 100)] public decimal DiscountPct { get; set; }
+    [Range(0, double.MaxValue)] public decimal DiscountAmount { get; set; }
+    [Range(0, double.MaxValue)] public decimal DiscountValue { get; set; }
+    [Range(0, 100)] public decimal TaxPct { get; set; }
+    public bool IsFreeIssue { get; set; }
+    public int? ParentLineId { get; set; }
+}
+
+public sealed class CreateSalesInvoiceRequest
+{
+    [Required] public int CustomerId { get; set; }
+    [Required] public int WarehouseId { get; set; }
+    [Required, EnumDataType(typeof(SalesInvoiceType))] public SalesInvoiceType InvoiceType { get; set; } = SalesInvoiceType.B2C;
+    [Required, MinLength(1)] public List<CreateSalesInvoiceLineRequest> Lines { get; set; } = new();
+}
+
+public sealed class UpdateSalesInvoiceRequest
+{
+    [Required] public int CustomerId { get; set; }
+    [Required] public int WarehouseId { get; set; }
+    [Required, EnumDataType(typeof(SalesInvoiceType))] public SalesInvoiceType InvoiceType { get; set; } = SalesInvoiceType.B2C;
+    [Required, MinLength(1)] public List<CreateSalesInvoiceLineRequest> Lines { get; set; } = new();
+}

Backend/ERPCore/Dtos/Sales/SalesPromotionSuggestionDtos.cs

@@ -0,0 +1,23 @@
+namespace ERPCore.Dtos.Sales;
+
+public sealed record SalesFreeIssueRewardOptionDto(
+    int ItemId,
+    string Sku,
+    string Name,
+    decimal? SalePrice);
+
+public sealed record SalesFreeIssueSuggestionLineDto(
+    int SalesSlipLineId,
+    int ItemId,
+    string ItemSku,
+    string ItemName,
+    decimal Qty,
+    decimal SuggestedFreeQty,
+    decimal TriggerQty,
+    IReadOnlyList<SalesFreeIssueRewardOptionDto> RewardOptions);
+
+public sealed record SalesFreeIssueSuggestionDto(
+    int SalesSlipId,
+    string SlipNo,
+    DateTime SlipDate,
+    IReadOnlyList<SalesFreeIssueSuggestionLineDto> Lines);

Backend/ERPCore/Dtos/Sales/SalesReportDtos.cs

@@ -0,0 +1,68 @@
+namespace ERPCore.Dtos.Sales;
+
+public sealed record SalesDailySummaryRowDto(
+    DateOnly Date,
+    int InvoiceCount,
+    int SlipCount,
+    decimal InvoiceSubtotal,
+    decimal SlipSubtotal,
+    decimal DiscountTotal,
+    decimal FreeQtyTotal,
+    decimal TaxTotal,
+    decimal GrandTotal);
+
+public sealed record SalesItemSummaryRowDto(
+    int ItemId,
+    string ItemName,
+    decimal SoldQty,
+    decimal FreeQty,
+    decimal GrossAmount,
+    decimal DiscountTotal,
+    decimal TaxTotal,
+    decimal NetAmount);
+
+public sealed record SalesCustomerSummaryRowDto(
+    int CustomerId,
+    string CustomerName,
+    int InvoiceCount,
+    int SlipCount,
+    decimal SoldQty,
+    decimal FreeQty,
+    decimal GrossAmount,
+    decimal DiscountTotal,
+    decimal TaxTotal,
+    decimal NetAmount);
+
+public sealed record SalesWarehouseSummaryRowDto(
+    int WarehouseId,
+    string WarehouseName,
+    int InvoiceCount,
+    int SlipCount,
+    decimal SoldQty,
+    decimal FreeQty,
+    decimal GrossAmount,
+    decimal DiscountTotal,
+    decimal TaxTotal,
+    decimal NetAmount);
+
+public sealed record SalesDiscountSummaryRowDto(
+    string DocumentType,
+    string DocumentNo,
+    DateTime DocumentDate,
+    string CustomerName,
+    decimal Subtotal,
+    decimal DiscountTotal,
+    decimal TaxTotal,
+    decimal NetAmount);
+
+public sealed record SalesFreeIssueSummaryRowDto(
+    string DocumentType,
+    string DocumentNo,
+    DateTime DocumentDate,
+    string CustomerName,
+    int ItemId,
+    string ItemName,
+    decimal FreeQty,
+    decimal FreeValue,
+    int WarehouseId,
+    string WarehouseName);

Backend/ERPCore/Dtos/Sales/SalesReportQueryDtos.cs

@@ -0,0 +1,21 @@
+namespace ERPCore.Dtos.Sales;
+
+public sealed record SalesReportDefinitionDto(
+    string Id,
+    string Name,
+    string Description,
+    IReadOnlyList<string> SupportedFilters);
+
+public sealed record SalesReportQueryRequest(
+    string ReportType,
+    DateOnly From,
+    DateOnly To,
+    int? ItemId = null,
+    int? CustomerId = null,
+    int? WarehouseId = null);
+
+public sealed record SalesReportQueryResponse(
+    string ReportType,
+    DateOnly From,
+    DateOnly To,
+    IReadOnlyList<object> Rows);

Backend/ERPCore/Dtos/Sales/SalesSlipDtos.cs

@@ -0,0 +1,77 @@
+using System.ComponentModel.DataAnnotations;
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Dtos.Sales;
+
+public sealed record SalesSlipLineDto(
+    int SalesSlipLineId, int ItemId, string Description, decimal Qty, decimal FreeQty, int UomId,
+    int WarehouseId, decimal UnitPrice, decimal BaseCost, string PriceSource, decimal DiscountPct,
+    decimal DiscountAmount, SalesDiscountMode DiscountMode, decimal NetUnitPrice, decimal LineTotal,
+    decimal TaxPct, decimal TaxAmount, bool IsFreeIssue, int? ParentLineId);
+
+public sealed record SalesSlipTotalsDto(
+    decimal Subtotal, decimal DiscountTotal, decimal FreeQtyTotal, decimal TaxTotal, decimal GrandTotal,
+    decimal PaidAmount, decimal BalanceAmount);
+
+public sealed record SalesSlipDto(
+    int SalesSlipId, string SlipNo, DateTime SlipDate, int CustomerId,
+    string CustomerSnapshotName, int WarehouseId, int CashierUserId, SalesSlipStatus Status,
+    DateTime CreatedAt, DateTime? UpdatedAt, SalesSlipTotalsDto Totals, IReadOnlyList<SalesSlipLineDto> Lines);
+
+public sealed record SalesSlipSummaryDto(
+    int SalesSlipId, string SlipNo, DateTime SlipDate, int CustomerId,
+    string CustomerSnapshotName, int WarehouseId, SalesSlipStatus Status,
+    SalesSlipTotalsDto Totals, DateTime CreatedAt);
+
+public sealed record SalesSlipPostingIssueDto(
+    int SalesSlipLineId, int ItemId, string ItemSku, string ItemName, int WarehouseId,
+    decimal RequestedQty, decimal AvailableQty, decimal ShortQty, bool IsFreeIssue);
+
+public sealed record SalesSlipPostingCheckDto(
+    int SalesSlipId, string SlipNo, SalesSlipStatus Status, bool CanPost,
+    IReadOnlyList<SalesSlipPostingIssueDto> Issues);
+
+public sealed record FreeIssueSummaryDto(
+    int SalesSlipId, string SlipNo, SalesSlipStatus Status, DateTime CreatedAt,
+    int WarehouseId, string WarehouseName, int ItemId, string ItemSku, string ItemName,
+    int UomId, string UomName, decimal Qty, decimal FreeQty, string SchemeLabel);
+
+public sealed record FreeIssueDto(
+    int SalesSlipId, string SlipNo, DateTime SlipDate, SalesSlipStatus Status,
+    int CustomerId, string CustomerSnapshotName, int WarehouseId, string WarehouseName,
+    int CashierUserId, DateTime CreatedAt, DateTime? UpdatedAt, FreeIssueSummaryDto Summary,
+    IReadOnlyList<SalesSlipLineDto> Lines);
+
+public sealed class CreateSalesSlipLineRequest
+{
+    [Required] public int ItemId { get; set; }
+    [Required] public int UomId { get; set; }
+    [Required] public int WarehouseId { get; set; }
+    [Range(0.0001, double.MaxValue)] public decimal Qty { get; set; }
+    [Range(0, double.MaxValue)] public decimal FreeQty { get; set; }
+    [Range(0, double.MaxValue)] public decimal? UnitPrice { get; set; }
+    public bool AllowManualPriceOverride { get; set; }
+    [Required, EnumDataType(typeof(SalesDiscountMode))] public SalesDiscountMode DiscountMode { get; set; } = SalesDiscountMode.Percentage;
+    [Range(0, 100)] public decimal DiscountPct { get; set; }
+    [Range(0, double.MaxValue)] public decimal DiscountAmount { get; set; }
+    [Range(0, double.MaxValue)] public decimal DiscountValue { get; set; }
+    [Range(0, 100)] public decimal TaxPct { get; set; }
+    public bool IsFreeIssue { get; set; }
+    public int? ParentLineId { get; set; }
+}
+
+public sealed class CreateSalesSlipRequest
+{
+    [Required] public int CustomerId { get; set; }
+    [Required] public int WarehouseId { get; set; }
+    [Required] public int CashierUserId { get; set; }
+    [Required, MinLength(1)] public List<CreateSalesSlipLineRequest> Lines { get; set; } = new();
+}
+
+public sealed class UpdateSalesSlipRequest
+{
+    [Required] public int CustomerId { get; set; }
+    [Required] public int WarehouseId { get; set; }
+    [Required] public int CashierUserId { get; set; }
+    [Required, MinLength(1)] public List<CreateSalesSlipLineRequest> Lines { get; set; } = new();
+}

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

@@ -0,0 +1,46 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+public sealed class BundleSaleConfiguration : IEntityTypeConfiguration<BundleSale>
+{
+    public void Configure(EntityTypeBuilder<BundleSale> builder)
+    {
+        builder.ToTable("bundle_sales");
+        builder.HasKey(x => x.BundleSaleId);
+        builder.Property(x => x.BundleNo).IsRequired().HasMaxLength(50);
+        builder.HasIndex(x => x.BundleNo).IsUnique();
+        builder.Property(x => x.BundleDate).IsRequired();
+        builder.Property(x => x.CustomerSnapshotName).IsRequired().HasMaxLength(200);
+        builder.Property(x => x.BundleName).IsRequired().HasMaxLength(200);
+        builder.Property(x => x.BundleCode).IsRequired().HasMaxLength(50);
+        builder.Property(x => x.Status)
+            .HasConversion<string>().HasMaxLength(20).IsRequired()
+            .HasDefaultValue(BundleSaleStatus.Draft);
+        builder.Property(x => x.ComponentSubtotal).HasPrecision(18, 4);
+        builder.Property(x => x.BundlePrice).HasPrecision(18, 4);
+        builder.Property(x => x.MarginAmount).HasPrecision(18, 4);
+        builder.Property(x => x.DiscountTotal).HasPrecision(18, 4);
+        builder.Property(x => x.TaxTotal).HasPrecision(18, 4);
+        builder.Property(x => x.GrandTotal).HasPrecision(18, 4);
+        builder.Property(x => x.CreatedAt).IsRequired();
+        builder.Property(x => x.ConcurrencyStamp)
+            .IsRequired()
+            .HasColumnType("integer")
+            .HasDefaultValue(0)
+            .IsConcurrencyToken();
+
+        builder.HasOne(x => x.Customer).WithMany().HasForeignKey(x => x.CustomerId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(x => x.Warehouse).WithMany().HasForeignKey(x => x.WarehouseId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(x => x.CashierUser).WithMany().HasForeignKey(x => x.CashierUserId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(x => x.BundleSaleTemplate).WithMany().HasForeignKey(x => x.BundleSaleTemplateId).OnDelete(DeleteBehavior.Restrict);
+
+        builder.HasMany(x => x.Lines)
+            .WithOne(x => x.BundleSale)
+            .HasForeignKey(x => x.BundleSaleId)
+            .OnDelete(DeleteBehavior.Cascade);
+    }
+}

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

@@ -0,0 +1,24 @@
+using ERPCore.Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+public sealed class BundleSaleLineConfiguration : IEntityTypeConfiguration<BundleSaleLine>
+{
+    public void Configure(EntityTypeBuilder<BundleSaleLine> builder)
+    {
+        builder.ToTable("bundle_sale_lines");
+        builder.HasKey(x => x.BundleSaleLineId);
+        builder.Property(x => x.Description).IsRequired().HasMaxLength(200);
+        builder.Property(x => x.Qty).HasPrecision(18, 4);
+        builder.Property(x => x.UnitPrice).HasPrecision(18, 4);
+        builder.Property(x => x.LineTotal).HasPrecision(18, 4);
+        builder.Property(x => x.IncludeInBundle).HasDefaultValue(true);
+        builder.Property(x => x.IsComponent).HasDefaultValue(true);
+
+        builder.HasOne(x => x.Item).WithMany().HasForeignKey(x => x.ItemId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(x => x.Uom).WithMany().HasForeignKey(x => x.UomId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(x => x.Warehouse).WithMany().HasForeignKey(x => x.WarehouseId).OnDelete(DeleteBehavior.Restrict);
+    }
+}

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

@@ -0,0 +1,34 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+public sealed class BundleSaleTemplateConfiguration : IEntityTypeConfiguration<BundleSaleTemplate>
+{
+    public void Configure(EntityTypeBuilder<BundleSaleTemplate> builder)
+    {
+        builder.ToTable("bundle_sale_templates");
+        builder.HasKey(x => x.BundleSaleTemplateId);
+
+        builder.Property(x => x.TemplateCode).IsRequired().HasMaxLength(50);
+        builder.HasIndex(x => x.TemplateCode).IsUnique();
+        builder.Property(x => x.TemplateName).IsRequired().HasMaxLength(200);
+        builder.Property(x => x.Description).HasMaxLength(1000);
+        builder.Property(x => x.Status)
+            .HasConversion<string>().HasMaxLength(20).IsRequired()
+            .HasDefaultValue(EntityStatus.Active);
+        builder.Property(x => x.CreatedAt).IsRequired();
+        builder.Property(x => x.ConcurrencyStamp)
+            .IsRequired()
+            .HasColumnType("integer")
+            .HasDefaultValue(0)
+            .IsConcurrencyToken();
+
+        builder.HasMany(x => x.Lines)
+            .WithOne(x => x.BundleSaleTemplate)
+            .HasForeignKey(x => x.BundleSaleTemplateId)
+            .OnDelete(DeleteBehavior.Cascade);
+    }
+}

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

@@ -0,0 +1,21 @@
+using ERPCore.Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+public sealed class BundleSaleTemplateLineConfiguration : IEntityTypeConfiguration<BundleSaleTemplateLine>
+{
+    public void Configure(EntityTypeBuilder<BundleSaleTemplateLine> builder)
+    {
+        builder.ToTable("bundle_sale_template_lines");
+        builder.HasKey(x => x.BundleSaleTemplateLineId);
+        builder.Property(x => x.Qty).HasPrecision(18, 4);
+        builder.Property(x => x.UnitPrice).HasPrecision(18, 4);
+        builder.Property(x => x.SortOrder).HasDefaultValue(0);
+
+        builder.HasOne(x => x.Item).WithMany().HasForeignKey(x => x.ItemId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(x => x.Uom).WithMany().HasForeignKey(x => x.UomId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(x => x.Warehouse).WithMany().HasForeignKey(x => x.WarehouseId).OnDelete(DeleteBehavior.Restrict);
+    }
+}

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

@@ -0,0 +1,50 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+public sealed class CustomerConfiguration : IEntityTypeConfiguration<Customer>
+{
+    public void Configure(EntityTypeBuilder<Customer> builder)
+    {
+        builder.ToTable("customers");
+        builder.HasKey(c => c.CustomerId);
+
+        builder.Property(c => c.CustomerCode).IsRequired().HasMaxLength(50);
+        builder.HasIndex(c => c.CustomerCode).IsUnique();
+
+        builder.Property(c => c.CustomerType)
+            .HasConversion<string>().HasMaxLength(20).IsRequired()
+            .HasDefaultValue(CustomerType.B2C);
+
+        builder.Property(c => c.Name).IsRequired().HasMaxLength(200);
+        builder.Property(c => c.DisplayName).HasMaxLength(200);
+        builder.Property(c => c.Phone).HasMaxLength(30);
+        builder.Property(c => c.Email).HasMaxLength(100);
+        builder.Property(c => c.AddressLine1).HasMaxLength(250);
+        builder.Property(c => c.AddressLine2).HasMaxLength(250);
+        builder.Property(c => c.City).HasMaxLength(100);
+        builder.Property(c => c.Country).HasMaxLength(100);
+        builder.Property(c => c.TaxRegistrationNo).HasMaxLength(50);
+
+        builder.Property(c => c.CreditLimit).HasPrecision(18, 4);
+        builder.Property(c => c.CreditDays).IsRequired();
+
+        builder.HasOne(c => c.DefaultWarehouse)
+            .WithMany()
+            .HasForeignKey(c => c.DefaultWarehouseId)
+            .OnDelete(DeleteBehavior.SetNull);
+
+        builder.Property(c => c.Status)
+            .HasConversion<string>().HasMaxLength(20).IsRequired()
+            .HasDefaultValue(EntityStatus.Active);
+
+        builder.Property(c => c.CreatedAt).IsRequired();
+        builder.Property(c => c.RowVersion).IsRowVersion();
+
+        builder.HasIndex(c => c.Status);
+        builder.HasIndex(c => c.CustomerType);
+    }
+}

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

@@ -38,7 +38,8 @@ public sealed class NavItemConfiguration : IEntityTypeConfiguration<NavItem>
             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 },
             new NavItem { NavItemId = 11, Code = "ledgers", Label = "Ledgers", Href = "/dashboard/ledgers", SortOrder = 11 },
-            new NavItem { NavItemId = 12, Code = "accounts", Label = "Accounts", Href = "/dashboard/accounts", SortOrder = 12 }
+            new NavItem { NavItemId = 12, Code = "accounts", Label = "Accounts", Href = "/dashboard/accounts", SortOrder = 12 },
+            new NavItem { NavItemId = 13, Code = "sales", Label = "Sales", Href = "/dashboard/sales", SortOrder = 13 }
         );
     }
 }

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

@@ -0,0 +1,95 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+public sealed class SalesInvoiceConfiguration : IEntityTypeConfiguration<SalesInvoice>
+{
+    public void Configure(EntityTypeBuilder<SalesInvoice> builder)
+    {
+        builder.ToTable("sales_invoices");
+        builder.HasKey(x => x.SalesInvoiceId);
+
+        builder.Property(x => x.InvoiceNo).IsRequired().HasMaxLength(50);
+        builder.HasIndex(x => x.InvoiceNo).IsUnique();
+
+        builder.Property(x => x.InvoiceDate).IsRequired();
+
+        builder.HasOne(x => x.Customer)
+            .WithMany()
+            .HasForeignKey(x => x.CustomerId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.Property(x => x.CustomerSnapshotName).IsRequired().HasMaxLength(200);
+        builder.Property(x => x.CustomerSnapshotTaxNo).HasMaxLength(50);
+
+        builder.HasOne(x => x.Warehouse)
+            .WithMany()
+            .HasForeignKey(x => x.WarehouseId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.Property(x => x.InvoiceType)
+            .HasConversion<string>().HasMaxLength(20).IsRequired()
+            .HasDefaultValue(SalesInvoiceType.B2C);
+
+        builder.Property(x => x.Status)
+            .HasConversion<string>().HasMaxLength(20).IsRequired()
+            .HasDefaultValue(SalesInvoiceStatus.Draft);
+
+        foreach (var p in new[] { nameof(SalesInvoice.Subtotal), nameof(SalesInvoice.DiscountTotal), nameof(SalesInvoice.TaxTotal), nameof(SalesInvoice.GrandTotal), nameof(SalesInvoice.RoundOff), nameof(SalesInvoice.NetPayable), nameof(SalesInvoice.PaidAmount), nameof(SalesInvoice.BalanceAmount) })
+            builder.Property<decimal>(p).HasPrecision(18, 4);
+
+        builder.Property(x => x.CreatedAt).IsRequired();
+        builder.Property(x => x.RowVersion).IsRowVersion();
+
+        builder.HasIndex(x => x.Status);
+        builder.HasIndex(x => x.InvoiceDate);
+
+        builder.HasMany(x => x.Lines)
+            .WithOne(x => x.SalesInvoice)
+            .HasForeignKey(x => x.SalesInvoiceId)
+            .OnDelete(DeleteBehavior.Cascade);
+    }
+}
+
+public sealed class SalesInvoiceLineConfiguration : IEntityTypeConfiguration<SalesInvoiceLine>
+{
+    public void Configure(EntityTypeBuilder<SalesInvoiceLine> builder)
+    {
+        builder.ToTable("sales_invoice_lines");
+        builder.HasKey(x => x.SalesInvoiceLineId);
+
+        builder.HasOne(x => x.Item)
+            .WithMany()
+            .HasForeignKey(x => x.ItemId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.Property(x => x.Description).IsRequired().HasMaxLength(200);
+
+        builder.Property(x => x.Qty).HasPrecision(18, 4);
+        builder.Property(x => x.FreeQty).HasPrecision(18, 4);
+        builder.Property(x => x.UnitPrice).HasPrecision(18, 4);
+        builder.Property(x => x.BaseCost).HasPrecision(18, 4);
+        builder.Property(x => x.DiscountPct).HasPrecision(9, 4);
+        builder.Property(x => x.DiscountAmount).HasPrecision(18, 4);
+        builder.Property(x => x.NetUnitPrice).HasPrecision(18, 4);
+        builder.Property(x => x.LineTotal).HasPrecision(18, 4);
+        builder.Property(x => x.TaxPct).HasPrecision(9, 4);
+        builder.Property(x => x.TaxAmount).HasPrecision(18, 4);
+
+        builder.HasOne(x => x.Uom)
+            .WithMany()
+            .HasForeignKey(x => x.UomId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.HasOne(x => x.Warehouse)
+            .WithMany()
+            .HasForeignKey(x => x.WarehouseId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.Property(x => x.PriceSource).HasMaxLength(50);
+        builder.Property(x => x.RowVersion).IsRowVersion();
+    }
+}

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

@@ -0,0 +1,95 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+public sealed class SalesSlipConfiguration : IEntityTypeConfiguration<SalesSlip>
+{
+    public void Configure(EntityTypeBuilder<SalesSlip> builder)
+    {
+        builder.ToTable("sales_slips");
+        builder.HasKey(x => x.SalesSlipId);
+
+        builder.Property(x => x.SlipNo).IsRequired().HasMaxLength(50);
+        builder.HasIndex(x => x.SlipNo).IsUnique();
+
+        builder.Property(x => x.SlipDate).IsRequired();
+
+        builder.HasOne(x => x.Customer)
+            .WithMany()
+            .HasForeignKey(x => x.CustomerId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.Property(x => x.CustomerSnapshotName).IsRequired().HasMaxLength(200);
+
+        builder.HasOne(x => x.Warehouse)
+            .WithMany()
+            .HasForeignKey(x => x.WarehouseId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.HasOne(x => x.CashierUser)
+            .WithMany()
+            .HasForeignKey(x => x.CashierUserId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.Property(x => x.Status)
+            .HasConversion<string>().HasMaxLength(20).IsRequired()
+            .HasDefaultValue(SalesSlipStatus.Draft);
+
+        foreach (var p in new[] { nameof(SalesSlip.Subtotal), nameof(SalesSlip.DiscountTotal), nameof(SalesSlip.TaxTotal), nameof(SalesSlip.GrandTotal), nameof(SalesSlip.PaidAmount), nameof(SalesSlip.BalanceAmount) })
+            builder.Property<decimal>(p).HasPrecision(18, 4);
+
+        builder.Property(x => x.CreatedAt).IsRequired();
+        builder.Property(x => x.RowVersion).IsRowVersion();
+
+        builder.HasIndex(x => x.Status);
+        builder.HasIndex(x => x.SlipDate);
+
+        builder.HasMany(x => x.Lines)
+            .WithOne(x => x.SalesSlip)
+            .HasForeignKey(x => x.SalesSlipId)
+            .OnDelete(DeleteBehavior.Cascade);
+    }
+}
+
+public sealed class SalesSlipLineConfiguration : IEntityTypeConfiguration<SalesSlipLine>
+{
+    public void Configure(EntityTypeBuilder<SalesSlipLine> builder)
+    {
+        builder.ToTable("sales_slip_lines");
+        builder.HasKey(x => x.SalesSlipLineId);
+
+        builder.HasOne(x => x.Item)
+            .WithMany()
+            .HasForeignKey(x => x.ItemId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.Property(x => x.Description).IsRequired().HasMaxLength(200);
+
+        builder.Property(x => x.Qty).HasPrecision(18, 4);
+        builder.Property(x => x.FreeQty).HasPrecision(18, 4);
+        builder.Property(x => x.UnitPrice).HasPrecision(18, 4);
+        builder.Property(x => x.BaseCost).HasPrecision(18, 4);
+        builder.Property(x => x.DiscountPct).HasPrecision(9, 4);
+        builder.Property(x => x.DiscountAmount).HasPrecision(18, 4);
+        builder.Property(x => x.NetUnitPrice).HasPrecision(18, 4);
+        builder.Property(x => x.LineTotal).HasPrecision(18, 4);
+        builder.Property(x => x.TaxPct).HasPrecision(9, 4);
+        builder.Property(x => x.TaxAmount).HasPrecision(18, 4);
+
+        builder.HasOne(x => x.Uom)
+            .WithMany()
+            .HasForeignKey(x => x.UomId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.HasOne(x => x.Warehouse)
+            .WithMany()
+            .HasForeignKey(x => x.WarehouseId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.Property(x => x.PriceSource).HasMaxLength(50);
+        builder.Property(x => x.RowVersion).IsRowVersion();
+    }
+}

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

@@ -33,6 +33,7 @@ public sealed class SubNavItemConfiguration : IEntityTypeConfiguration<SubNavIte
             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 },
+            new SubNavItem { SubNavItemId = 23, NavItemId = 13, Code = "sales.bundle-sales", Label = "Bundle Sales", Href = "/dashboard/sales/bundles", SortOrder = 1 },
             // Procurement (NavItemId 4) children — mirror the hub page order.
             // IDs 17-20 (not 9-12): 9-12 were already claimed by the Ledgers sub-items below;
             // these procurement rows were never actually migrated into the database before now.

Backend/ERPCore/Infra/Persistence/DataSeeder.cs

@@ -1,4 +1,5 @@
 using ERPCore.Domain.Entities;
+using ERPCore.Domain;
 using ERPCore.Domain.Enums;
 using Microsoft.EntityFrameworkCore;
 
@@ -42,7 +43,11 @@ public static class DataSeeder
     {
         var dirty = await SeedReasonCodesAsync(db, ct);
         dirty |= await SeedItemTypesAsync(db, ct);
+       // dirty |= await SeedCompanyProfileAsync(db, ct);
         dirty |= await SeedProductConfigAsync(db, ct);
+        dirty |= await SeedSalesMastersAsync(db, ct);
+        dirty |= await SeedSalesStockAsync(db, ct);
+        dirty |= await SeedSalesAsync(db, ct);
 
         if (dirty) await db.SaveChangesAsync(ct);
     }
@@ -99,4 +104,754 @@ public static class DataSeeder
         });
         return true;
     }
+
+    /// <summary>
+    /// Seeds a printable company profile with reasonable defaults for invoice headers.
+    /// These values are intentionally editable later through the API.
+    /// </summary>
+    //private static async Task<bool> SeedCompanyProfileAsync(ErpDbContext db, CancellationToken ct)
+    //{
+    //    if (await db.CompanyProfiles.AnyAsync(c => c.CompanyProfileId == CompanyProfile.SingletonId, ct)) return false;
+
+    //    db.CompanyProfiles.Add(new CompanyProfile
+    //    {
+    //        CompanyProfileId = CompanyProfile.SingletonId,
+    //        LegalName = "ERP Core Trading (Pvt) Ltd",
+    //        TradeName = "ERP Core Trading",
+    //        TaxRegistrationNo = "TAX-DEFAULT-001",
+    //        VatRegistrationNo = "VAT-DEFAULT-001",
+    //        AddressLine1 = "1 Demo Street",
+    //        City = "Colombo",
+    //        Country = "Sri Lanka",
+    //        Phone = "+94 11 000 0000",
+    //        Email = "accounts@example.com",
+    //        BankName = "Demo Bank",
+    //        BankBranch = "Colombo Main",
+    //        AccountName = "ERP Core Trading (Pvt) Ltd",
+    //        AccountNumber = "000123456789",
+    //        SwiftCode = "DEMO1234",
+    //        FooterNote = "Thank you for your business."
+    //    });
+    //    return true;
+    //}
+
+    /// <summary>
+    /// Seeds the minimum catalog data required for the sales demo rows to exist.
+    /// These are safe additive rows and do not alter any existing data.
+    /// </summary>
+    private static async Task<bool> SeedSalesMastersAsync(ErpDbContext db, CancellationToken ct)
+    {
+        var dirty = false;
+
+        dirty |= await SeedWarehousesAsync(db, ct);
+        dirty |= await SeedUomsAsync(db, ct);
+        dirty |= await SeedCategoriesAsync(db, ct);
+        dirty |= await SeedItemsAsync(db, ct);
+
+        return dirty;
+    }
+
+    /// <summary>
+    /// Seeds a simple on-hand FIFO layer for the demo sales item so the sample
+    /// invoices can be posted without immediately failing stock validation.
+    /// This keeps the stock-check and posting flows testable on a fresh database.
+    /// </summary>
+    private static async Task<bool> SeedSalesStockAsync(ErpDbContext db, CancellationToken ct)
+    {
+        var warehouse = await db.Warehouses.AsNoTracking()
+            .OrderBy(w => w.WarehouseId)
+            .FirstOrDefaultAsync(ct);
+        var item = await db.Items.AsNoTracking()
+            .OrderBy(i => i.ItemId)
+            .FirstOrDefaultAsync(ct);
+        var secondItem = await db.Items.AsNoTracking()
+            .OrderByDescending(i => i.ItemId)
+            .FirstOrDefaultAsync(ct);
+
+        if (warehouse is null || item is null || secondItem is null)
+            return false;
+
+        var existing = await db.StockLayers.AnyAsync(
+            l => (l.ItemId == item.ItemId || l.ItemId == secondItem.ItemId) && l.WarehouseId == warehouse.WarehouseId && l.QtyRemaining > 0m,
+            ct);
+        if (existing) return false;
+
+        db.StockLayers.Add(new StockLayer
+        {
+            ItemId = item.ItemId,
+            WarehouseId = warehouse.WarehouseId,
+            QtyReceived = 100m,
+            QtyRemaining = 100m,
+            UnitCost = item.SalePrice.GetValueOrDefault() > 0m ? item.SalePrice.GetValueOrDefault() / 2m : 25m,
+            ReceiptDate = DateTime.UtcNow.AddDays(-7)
+        });
+        db.StockLayers.Add(new StockLayer
+        {
+            ItemId = secondItem.ItemId,
+            WarehouseId = warehouse.WarehouseId,
+            QtyReceived = 5m,
+            QtyRemaining = 5m,
+            UnitCost = secondItem.SalePrice.GetValueOrDefault() > 0m ? secondItem.SalePrice.GetValueOrDefault() / 2m : 15m,
+            ReceiptDate = DateTime.UtcNow.AddDays(-6)
+        });
+        return true;
+    }
+
+    private static async Task<bool> SeedWarehousesAsync(ErpDbContext db, CancellationToken ct)
+    {
+        var existingCodes = await db.Warehouses.Select(w => w.Code).ToListAsync(ct);
+        var have = existingCodes.ToHashSet(StringComparer.OrdinalIgnoreCase);
+
+        var seeds = new[]
+        {
+            new Warehouse { Code = "MAIN", Name = "Main Warehouse" },
+            new Warehouse { Code = "SHOP", Name = "Sales Counter" }
+        };
+
+        var toAdd = seeds.Where(w => !have.Contains(w.Code)).ToList();
+        if (toAdd.Count == 0) return false;
+
+        db.Warehouses.AddRange(toAdd);
+        return true;
+    }
+
+    private static async Task<bool> SeedUomsAsync(ErpDbContext db, CancellationToken ct)
+    {
+        var existingNames = await db.Uoms.Select(u => u.Name).ToListAsync(ct);
+        var have = existingNames.ToHashSet(StringComparer.OrdinalIgnoreCase);
+
+        var seeds = new[]
+        {
+            new Uom { Name = "PCS" },
+            new Uom { Name = "BOX" }
+        };
+
+        var toAdd = seeds.Where(u => !have.Contains(u.Name)).ToList();
+        if (toAdd.Count == 0) return false;
+
+        db.Uoms.AddRange(toAdd);
+        return true;
+    }
+
+    private static async Task<bool> SeedCategoriesAsync(ErpDbContext db, CancellationToken ct)
+    {
+        var existingNames = await db.Categories.Select(c => c.Name).ToListAsync(ct);
+        var have = existingNames.ToHashSet(StringComparer.OrdinalIgnoreCase);
+
+        var seeds = new[]
+        {
+            new Category { Name = "General Goods", Status = EntityStatus.Active, CreatedAt = DateTime.UtcNow },
+            new Category { Name = "Accessories", Status = EntityStatus.Active, CreatedAt = DateTime.UtcNow }
+        };
+
+        var toAdd = seeds.Where(c => !have.Contains(c.Name)).ToList();
+        if (toAdd.Count == 0) return false;
+
+        db.Categories.AddRange(toAdd);
+        return true;
+    }
+
+    private static async Task<bool> SeedItemsAsync(ErpDbContext db, CancellationToken ct)
+    {
+        var existingSkus = await db.Items.Select(i => i.Sku).ToListAsync(ct);
+        var have = existingSkus.ToHashSet(StringComparer.OrdinalIgnoreCase);
+
+        var category = await db.Categories.AsNoTracking()
+            .OrderBy(c => c.CategoryId)
+            .FirstOrDefaultAsync(ct);
+        var uom = await db.Uoms.AsNoTracking()
+            .OrderBy(u => u.UomId)
+            .FirstOrDefaultAsync(ct);
+
+        if (category is null || uom is null)
+            return false;
+
+        var now = DateTime.UtcNow;
+        var seeds = new[]
+        {
+            new Item
+            {
+                Sku = "SKU-DEMO-001",
+                Name = "Demo Item 1",
+                Description = "Seeded sample item for sales documents",
+                CategoryId = category.CategoryId,
+                BaseUomId = uom.UomId,
+                StockNature = StockNature.Stocked,
+                TrackingMode = TrackingMode.None,
+                SalePrice = 100m,
+                Status = EntityStatus.Active,
+                CreatedAt = now
+            },
+            new Item
+            {
+                Sku = "SKU-DEMO-002",
+                Name = "Demo Item 2",
+                Description = "Secondary seeded sample item for sales documents",
+                CategoryId = category.CategoryId,
+                BaseUomId = uom.UomId,
+                StockNature = StockNature.Stocked,
+                TrackingMode = TrackingMode.None,
+                SalePrice = 50m,
+                Status = EntityStatus.Active,
+                CreatedAt = now
+            }
+        };
+
+        var toAdd = seeds.Where(i => !have.Contains(i.Sku)).ToList();
+        if (toAdd.Count == 0) return false;
+
+        db.Items.AddRange(toAdd);
+        return true;
+    }
+
+    /// <summary>
+    /// Seeds the minimum sales bootstrap data needed for UI/backend development:
+    /// a couple of customer rows, current-year document counters, and a few draft
+    /// invoice/slip samples when the required master data already exists.
+    /// This intentionally never clears or rewrites any existing rows.
+    /// </summary>
+    private static async Task<bool> SeedSalesAsync(ErpDbContext db, CancellationToken ct)
+    {
+        var dirty = false;
+
+        dirty |= await SeedSalesCustomersAsync(db, ct);
+        dirty |= await SeedSalesSequencesAsync(db, ct);
+        dirty |= await SeedSampleSalesDocsAsync(db, ct);
+
+        try
+        {
+            dirty |= await SeedBundleSalesAsync(db, ct);
+        }
+        catch
+        {
+            // Bundle demo data is best-effort only; never block startup because of seed drift.
+        }
+
+        return dirty;
+    }
+
+    private static async Task<bool> SeedSalesCustomersAsync(ErpDbContext db, CancellationToken ct)
+    {
+        var existingCodes = await db.Customers.Select(c => c.CustomerCode).ToListAsync(ct);
+        var have = existingCodes.ToHashSet(StringComparer.OrdinalIgnoreCase);
+
+        var seeds = new[]
+        {
+            new Customer
+            {
+                CustomerCode = "CUST-WALKIN",
+                CustomerType = CustomerType.B2C,
+                Name = "Walk-in Customer",
+                DisplayName = "Walk-in Customer",
+                CreditLimit = 0m,
+                CreditDays = 0,
+                Status = EntityStatus.Active,
+                CreatedAt = DateTime.UtcNow
+            },
+            new Customer
+            {
+                CustomerCode = "CUST-DEMO",
+                CustomerType = CustomerType.B2B,
+                Name = "Demo Retail Ltd",
+                DisplayName = "Demo Retail Ltd",
+                Phone = "+94 11 000 0000",
+                Email = "sales@example.com",
+                AddressLine1 = "1 Demo Street",
+                City = "Colombo",
+                Country = "Sri Lanka",
+                TaxRegistrationNo = "VAT-DEMO-001",
+                CreditLimit = 250000m,
+                CreditDays = 30,
+                Status = EntityStatus.Active,
+                CreatedAt = DateTime.UtcNow
+            }
+        };
+
+        var toAdd = seeds.Where(c => !have.Contains(c.CustomerCode)).ToList();
+        if (toAdd.Count == 0) return false;
+
+        db.Customers.AddRange(toAdd);
+        return true;
+    }
+
+    private static async Task<bool> SeedSalesSequencesAsync(ErpDbContext db, CancellationToken ct)
+    {
+        var year = DateTime.UtcNow.Year;
+        var existing = await db.NumberSequences
+            .Where(s => s.Year == year && (s.DocType == DocumentTypes.SalesInvoice || s.DocType == DocumentTypes.SalesSlip || s.DocType == DocumentTypes.BundleSale))
+            .Select(s => s.DocType)
+            .ToListAsync(ct);
+        var have = existing.ToHashSet(StringComparer.OrdinalIgnoreCase);
+
+        var seeds = new[]
+        {
+            new NumberSequence { DocType = DocumentTypes.SalesInvoice, Year = year, LastNumber = 0 },
+            new NumberSequence { DocType = DocumentTypes.SalesSlip, Year = year, LastNumber = 0 },
+            new NumberSequence { DocType = DocumentTypes.BundleSale, Year = year, LastNumber = 0 }
+        };
+
+        var toAdd = seeds.Where(s => !have.Contains(s.DocType)).ToList();
+        if (toAdd.Count == 0) return false;
+
+        db.NumberSequences.AddRange(toAdd);
+        return true;
+    }
+
+    private static async Task<bool> SeedBundleSalesAsync(ErpDbContext db, CancellationToken ct)
+    {
+        if (await db.BundleSaleTemplates.AnyAsync(ct) || await db.BundleSales.AnyAsync(ct))
+            return false;
+
+        var customer = await db.Customers.AsNoTracking()
+            .OrderBy(c => c.CustomerId)
+            .FirstOrDefaultAsync(ct);
+        var warehouse = await db.Warehouses.AsNoTracking()
+            .OrderBy(w => w.WarehouseId)
+            .FirstOrDefaultAsync(ct);
+        var secondaryWarehouse = await db.Warehouses.AsNoTracking()
+            .OrderByDescending(w => w.WarehouseId)
+            .FirstOrDefaultAsync(ct);
+        var items = await db.Items.AsNoTracking()
+            .OrderBy(i => i.ItemId)
+            .Take(2)
+            .ToListAsync(ct);
+        var uom = await db.Uoms.AsNoTracking()
+            .OrderBy(u => u.UomId)
+            .FirstOrDefaultAsync(ct);
+        var user = await db.Users.AsNoTracking()
+            .OrderBy(u => u.UserId)
+            .FirstOrDefaultAsync(ct);
+
+        if (customer is null || warehouse is null || secondaryWarehouse is null || items.Count < 2 || uom is null || user is null)
+            return false;
+
+        var now = DateTime.UtcNow;
+        var template = new BundleSaleTemplate
+        {
+            TemplateCode = "BND-DEMO-001",
+            TemplateName = "Demo Bundle Pack",
+            Description = "Seeded fixed bundle template for integration testing",
+            Status = EntityStatus.Active,
+            CreatedAt = now,
+            Lines =
+            [
+                new BundleSaleTemplateLine
+                {
+                    ItemId = items[0].ItemId,
+                    UomId = uom.UomId,
+                    WarehouseId = warehouse.WarehouseId,
+                    Qty = 1m,
+                    UnitPrice = items[0].SalePrice.GetValueOrDefault(),
+                    IncludeInBundle = true,
+                    SortOrder = 1
+                },
+                new BundleSaleTemplateLine
+                {
+                    ItemId = items[1].ItemId,
+                    UomId = uom.UomId,
+                    WarehouseId = warehouse.WarehouseId,
+                    Qty = 1m,
+                    UnitPrice = items[1].SalePrice.GetValueOrDefault(),
+                    IncludeInBundle = true,
+                    SortOrder = 2
+                }
+            ]
+        };
+
+        db.BundleSaleTemplates.Add(template);
+        await db.SaveChangesAsync(ct);
+
+        var bundleSales = new[]
+        {
+            new BundleSale
+            {
+                BundleNo = $"BND-{now:yyyy}-00001",
+                BundleDate = now.Date.AddDays(-2),
+                CustomerId = customer.CustomerId,
+                CustomerSnapshotName = customer.DisplayName ?? customer.Name,
+                WarehouseId = warehouse.WarehouseId,
+                CashierUserId = user.UserId,
+                BundleSaleTemplateId = template.BundleSaleTemplateId,
+                BundleName = "Demo Bundle Draft",
+                BundleCode = "BND-DEMO-001",
+                Status = BundleSaleStatus.Draft,
+                ComponentSubtotal = items[0].SalePrice.GetValueOrDefault() + items[1].SalePrice.GetValueOrDefault(),
+                BundlePrice = 0m,
+                MarginAmount = -(items[0].SalePrice.GetValueOrDefault() + items[1].SalePrice.GetValueOrDefault()),
+                DiscountTotal = items[0].SalePrice.GetValueOrDefault() + items[1].SalePrice.GetValueOrDefault(),
+                TaxTotal = 0m,
+                GrandTotal = 0m,
+                CreatedAt = now.AddDays(-2),
+                Lines =
+                [
+                    new BundleSaleLine
+                    {
+                        ItemId = items[0].ItemId,
+                        Description = items[0].Name,
+                        Qty = 1m,
+                        UomId = uom.UomId,
+                        WarehouseId = warehouse.WarehouseId,
+                        UnitPrice = items[0].SalePrice.GetValueOrDefault(),
+                        LineTotal = items[0].SalePrice.GetValueOrDefault(),
+                        IncludeInBundle = true,
+                        IsComponent = true
+                    },
+                    new BundleSaleLine
+                    {
+                        ItemId = items[1].ItemId,
+                        Description = items[1].Name,
+                        Qty = 1m,
+                        UomId = uom.UomId,
+                        WarehouseId = warehouse.WarehouseId,
+                        UnitPrice = items[1].SalePrice.GetValueOrDefault(),
+                        LineTotal = items[1].SalePrice.GetValueOrDefault(),
+                        IncludeInBundle = true,
+                        IsComponent = true
+                    }
+                ]
+            },
+            new BundleSale
+            {
+                BundleNo = $"BND-{now:yyyy}-00002",
+                BundleDate = now.Date.AddDays(-1),
+                CustomerId = customer.CustomerId,
+                CustomerSnapshotName = customer.DisplayName ?? customer.Name,
+                WarehouseId = warehouse.WarehouseId,
+                CashierUserId = user.UserId,
+                BundleSaleTemplateId = template.BundleSaleTemplateId,
+                BundleName = "Demo Bundle Posted",
+                BundleCode = "BND-DEMO-001",
+                Status = BundleSaleStatus.Posted,
+                ComponentSubtotal = items[0].SalePrice.GetValueOrDefault() + items[1].SalePrice.GetValueOrDefault(),
+                BundlePrice = (items[0].SalePrice.GetValueOrDefault() + items[1].SalePrice.GetValueOrDefault()) - 10m,
+                MarginAmount = -10m,
+                DiscountTotal = 10m,
+                TaxTotal = 0m,
+                GrandTotal = (items[0].SalePrice.GetValueOrDefault() + items[1].SalePrice.GetValueOrDefault()) - 10m,
+                CreatedAt = now.AddDays(-1),
+                UpdatedAt = now.AddHours(-2),
+                Lines =
+                [
+                    new BundleSaleLine
+                    {
+                        ItemId = items[0].ItemId,
+                        Description = items[0].Name,
+                        Qty = 1m,
+                        UomId = uom.UomId,
+                        WarehouseId = warehouse.WarehouseId,
+                        UnitPrice = items[0].SalePrice.GetValueOrDefault(),
+                        LineTotal = items[0].SalePrice.GetValueOrDefault(),
+                        IncludeInBundle = true,
+                        IsComponent = true
+                    },
+                    new BundleSaleLine
+                    {
+                        ItemId = items[1].ItemId,
+                        Description = items[1].Name,
+                        Qty = 1m,
+                        UomId = uom.UomId,
+                        WarehouseId = warehouse.WarehouseId,
+                        UnitPrice = items[1].SalePrice.GetValueOrDefault(),
+                        LineTotal = items[1].SalePrice.GetValueOrDefault(),
+                        IncludeInBundle = true,
+                        IsComponent = true
+                    }
+                ]
+            },
+            new BundleSale
+            {
+                BundleNo = $"BND-{now:yyyy}-00003",
+                BundleDate = now.Date,
+                CustomerId = customer.CustomerId,
+                CustomerSnapshotName = customer.DisplayName ?? customer.Name,
+                WarehouseId = secondaryWarehouse.WarehouseId,
+                CashierUserId = user.UserId,
+                BundleSaleTemplateId = template.BundleSaleTemplateId,
+                BundleName = "Demo Bundle Cancelled",
+                BundleCode = "BND-DEMO-001",
+                Status = BundleSaleStatus.Cancelled,
+                ComponentSubtotal = items[0].SalePrice.GetValueOrDefault(),
+                BundlePrice = items[0].SalePrice.GetValueOrDefault(),
+                MarginAmount = 0m,
+                DiscountTotal = 0m,
+                TaxTotal = 0m,
+                GrandTotal = items[0].SalePrice.GetValueOrDefault(),
+                CreatedAt = now,
+                UpdatedAt = now,
+                Lines =
+                [
+                    new BundleSaleLine
+                    {
+                        ItemId = items[0].ItemId,
+                        Description = items[0].Name,
+                        Qty = 1m,
+                        UomId = uom.UomId,
+                        WarehouseId = secondaryWarehouse.WarehouseId,
+                        UnitPrice = items[0].SalePrice.GetValueOrDefault(),
+                        LineTotal = items[0].SalePrice.GetValueOrDefault(),
+                        IncludeInBundle = true,
+                        IsComponent = true
+                    }
+                ]
+            }
+        };
+
+        db.BundleSales.AddRange(bundleSales);
+        return true;
+    }
+
+    private static async Task<bool> SeedSampleSalesDocsAsync(ErpDbContext db, CancellationToken ct)
+    {
+        if (await db.SalesInvoices.AnyAsync(ct) || await db.SalesSlips.AnyAsync(ct))
+            return false;
+
+        var customer = await db.Customers.AsNoTracking()
+            .OrderBy(c => c.CustomerId)
+            .FirstOrDefaultAsync(ct);
+        var warehouse = await db.Warehouses.AsNoTracking()
+            .OrderBy(w => w.WarehouseId)
+            .FirstOrDefaultAsync(ct);
+        var secondaryWarehouse = await db.Warehouses.AsNoTracking()
+            .OrderByDescending(w => w.WarehouseId)
+            .FirstOrDefaultAsync(ct);
+        var items = await db.Items.AsNoTracking()
+            .OrderBy(i => i.ItemId)
+            .Take(2)
+            .ToListAsync(ct);
+        var uom = await db.Uoms.AsNoTracking()
+            .OrderBy(u => u.UomId)
+            .FirstOrDefaultAsync(ct);
+        var user = await db.Users.AsNoTracking()
+            .OrderBy(u => u.UserId)
+            .FirstOrDefaultAsync(ct);
+
+        if (customer is null || warehouse is null || secondaryWarehouse is null || items.Count < 2 || uom is null || user is null)
+            return false;
+
+        var postableItem = items[0];
+        var shortageItem = items[1];
+        var today = DateTime.UtcNow.Date;
+        var createdAt = DateTime.UtcNow.AddDays(-1);
+
+        db.SalesInvoices.AddRange(
+            new SalesInvoice
+            {
+                InvoiceNo = $"SI-{today:yyyy}-00001",
+                InvoiceDate = today.AddDays(-2),
+                CustomerId = customer.CustomerId,
+                CustomerSnapshotName = customer.Name,
+                CustomerSnapshotTaxNo = customer.TaxRegistrationNo,
+                WarehouseId = warehouse.WarehouseId,
+                InvoiceType = SalesInvoiceType.B2C,
+                Status = SalesInvoiceStatus.Draft,
+                Subtotal = 200m,
+                DiscountTotal = 0m,
+                TaxTotal = 0m,
+                GrandTotal = 200m,
+                RoundOff = 0m,
+                NetPayable = 200m,
+                PaidAmount = 0m,
+                BalanceAmount = 200m,
+                CreatedBy = user.UserId,
+                CreatedAt = createdAt,
+                Lines =
+                [
+                    new SalesInvoiceLine
+                    {
+                        ItemId = postableItem.ItemId,
+                        Description = postableItem.Name,
+                        Qty = 2m,
+                        FreeQty = 0m,
+                        UomId = uom.UomId,
+                        WarehouseId = warehouse.WarehouseId,
+                        UnitPrice = 100m,
+                        BaseCost = 0m,
+                        PriceSource = "seed",
+                        DiscountMode = SalesDiscountMode.Percentage,
+                        DiscountPct = 0m,
+                        DiscountAmount = 0m,
+                        NetUnitPrice = 100m,
+                        LineTotal = 200m,
+                        TaxPct = 0m,
+                        TaxAmount = 0m,
+                        IsFreeIssue = false
+                    }
+                ]
+            },
+            new SalesInvoice
+            {
+                InvoiceNo = $"SI-{today:yyyy}-00002",
+                InvoiceDate = today.AddDays(-1),
+                CustomerId = customer.CustomerId,
+                CustomerSnapshotName = customer.Name,
+                CustomerSnapshotTaxNo = customer.TaxRegistrationNo,
+                WarehouseId = secondaryWarehouse.WarehouseId,
+                InvoiceType = SalesInvoiceType.B2B,
+                Status = SalesInvoiceStatus.Draft,
+                Subtotal = 300m,
+                DiscountTotal = 0m,
+                TaxTotal = 0m,
+                GrandTotal = 300m,
+                RoundOff = 0m,
+                NetPayable = 300m,
+                PaidAmount = 0m,
+                BalanceAmount = 300m,
+                CreatedBy = user.UserId,
+                CreatedAt = createdAt,
+                Lines =
+                [
+                    new SalesInvoiceLine
+                    {
+                        ItemId = shortageItem.ItemId,
+                        Description = shortageItem.Name,
+                        Qty = 6m,
+                        FreeQty = 0m,
+                        UomId = uom.UomId,
+                        WarehouseId = secondaryWarehouse.WarehouseId,
+                        UnitPrice = 50m,
+                        BaseCost = 0m,
+                        PriceSource = "seed",
+                        DiscountMode = SalesDiscountMode.Percentage,
+                        DiscountPct = 0m,
+                        DiscountAmount = 0m,
+                        NetUnitPrice = 50m,
+                        LineTotal = 300m,
+                        TaxPct = 0m,
+                        TaxAmount = 0m,
+                        IsFreeIssue = false
+                    }
+                ]
+            },
+            new SalesInvoice
+            {
+                InvoiceNo = $"SI-{today:yyyy}-00003",
+                InvoiceDate = today,
+                CustomerId = customer.CustomerId,
+                CustomerSnapshotName = customer.Name,
+                CustomerSnapshotTaxNo = customer.TaxRegistrationNo,
+                WarehouseId = warehouse.WarehouseId,
+                InvoiceType = SalesInvoiceType.B2C,
+                Status = SalesInvoiceStatus.Posted,
+                Subtotal = 100m,
+                DiscountTotal = 0m,
+                TaxTotal = 0m,
+                GrandTotal = 100m,
+                RoundOff = 0m,
+                NetPayable = 100m,
+                PaidAmount = 100m,
+                BalanceAmount = 0m,
+                CreatedBy = user.UserId,
+                CreatedAt = createdAt,
+                UpdatedAt = DateTime.UtcNow,
+                Lines =
+                [
+                    new SalesInvoiceLine
+                    {
+                        ItemId = postableItem.ItemId,
+                        Description = postableItem.Name,
+                        Qty = 1m,
+                        FreeQty = 0m,
+                        UomId = uom.UomId,
+                        WarehouseId = warehouse.WarehouseId,
+                        UnitPrice = 100m,
+                        BaseCost = 0m,
+                        PriceSource = "seed",
+                        DiscountMode = SalesDiscountMode.Percentage,
+                        DiscountPct = 0m,
+                        DiscountAmount = 0m,
+                        NetUnitPrice = 100m,
+                        LineTotal = 100m,
+                        TaxPct = 0m,
+                        TaxAmount = 0m,
+                        IsFreeIssue = false
+                    }
+                ]
+            }
+        );
+
+        db.SalesSlips.AddRange(
+            new SalesSlip
+            {
+                SlipNo = $"SSL-{today:yyyy}-00001",
+                SlipDate = today.AddDays(-2),
+                CustomerId = customer.CustomerId,
+                CustomerSnapshotName = customer.Name,
+                WarehouseId = warehouse.WarehouseId,
+                CashierUserId = user.UserId,
+                Status = SalesSlipStatus.Draft,
+                Subtotal = 50m,
+                DiscountTotal = 0m,
+                TaxTotal = 0m,
+                GrandTotal = 50m,
+                PaidAmount = 0m,
+                BalanceAmount = 50m,
+                CreatedAt = createdAt,
+                Lines =
+                [
+                    new SalesSlipLine
+                    {
+                        ItemId = postableItem.ItemId,
+                        Description = postableItem.Name,
+                        Qty = 1m,
+                        FreeQty = 0m,
+                        UomId = uom.UomId,
+                        WarehouseId = warehouse.WarehouseId,
+                        UnitPrice = 50m,
+                        BaseCost = 0m,
+                        PriceSource = "seed",
+                        DiscountMode = SalesDiscountMode.Percentage,
+                        DiscountPct = 0m,
+                        DiscountAmount = 0m,
+                        NetUnitPrice = 50m,
+                        LineTotal = 50m,
+                        TaxPct = 0m,
+                        TaxAmount = 0m,
+                        IsFreeIssue = false
+                    }
+                ]
+            },
+            new SalesSlip
+            {
+                SlipNo = $"SSL-{today:yyyy}-00002",
+                SlipDate = today.AddDays(-1),
+                CustomerId = customer.CustomerId,
+                CustomerSnapshotName = customer.Name,
+                WarehouseId = secondaryWarehouse.WarehouseId,
+                CashierUserId = user.UserId,
+                Status = SalesSlipStatus.Draft,
+                Subtotal = 150m,
+                DiscountTotal = 15m,
+                TaxTotal = 0m,
+                GrandTotal = 135m,
+                PaidAmount = 0m,
+                BalanceAmount = 135m,
+                CreatedAt = createdAt,
+                Lines =
+                [
+                    new SalesSlipLine
+                    {
+                        ItemId = shortageItem.ItemId,
+                        Description = shortageItem.Name,
+                        Qty = 3m,
+                        FreeQty = 0m,
+                        UomId = uom.UomId,
+                        WarehouseId = secondaryWarehouse.WarehouseId,
+                        UnitPrice = 50m,
+                        BaseCost = 0m,
+                        PriceSource = "seed",
+                        DiscountMode = SalesDiscountMode.Percentage,
+                        DiscountPct = 10m,
+                        DiscountAmount = 15m,
+                        NetUnitPrice = 45m,
+                        LineTotal = 135m,
+                        TaxPct = 0m,
+                        TaxAmount = 0m,
+                        IsFreeIssue = false
+                    }
+                ]
+            }
+        );
+
+        return true;
+    }
 }

Backend/ERPCore/Infra/Persistence/ErpDbContext.cs

@@ -15,6 +15,7 @@ namespace ERPCore.Infra.Persistence;
 public class ErpDbContext : DbContext
 {
     private readonly ICurrentUser _currentUser;
+    private bool _writingAuditLogs;
 
     public ErpDbContext(DbContextOptions<ErpDbContext> options, ICurrentUser currentUser) : base(options)
     {
@@ -22,6 +23,7 @@ public class ErpDbContext : DbContext
     }
 
     // --- Master Data (docs/10 Part C.1) ---
+    public DbSet<Customer> Customers => Set<Customer>();
     public DbSet<Category> Categories => Set<Category>();
     public DbSet<SubCategory> SubCategories => Set<SubCategory>();
     public DbSet<Brand> Brands => Set<Brand>();
@@ -34,6 +36,7 @@ public class ErpDbContext : DbContext
     public DbSet<Vendor> Vendors => Set<Vendor>();
     public DbSet<Warehouse> Warehouses => Set<Warehouse>();
     public DbSet<Bin> Bins => Set<Bin>();
+    
     /// <summary>Singleton row (FR-MD-11).</summary>
     public DbSet<ProductConfig> ProductConfig => Set<ProductConfig>();
 
@@ -82,6 +85,16 @@ public class ErpDbContext : DbContext
     public DbSet<PurchaseReturn> PurchaseReturns => Set<PurchaseReturn>();
     public DbSet<PurchaseReturnLine> PurchaseReturnLines => Set<PurchaseReturnLine>();
 
+    // --- Sales (Phase 1) ---
+    public DbSet<SalesInvoice> SalesInvoices => Set<SalesInvoice>();
+    public DbSet<SalesInvoiceLine> SalesInvoiceLines => Set<SalesInvoiceLine>();
+    public DbSet<SalesSlip> SalesSlips => Set<SalesSlip>();
+    public DbSet<SalesSlipLine> SalesSlipLines => Set<SalesSlipLine>();
+    public DbSet<BundleSaleTemplate> BundleSaleTemplates => Set<BundleSaleTemplate>();
+    public DbSet<BundleSaleTemplateLine> BundleSaleTemplateLines => Set<BundleSaleTemplateLine>();
+    public DbSet<BundleSale> BundleSales => Set<BundleSale>();
+    public DbSet<BundleSaleLine> BundleSaleLines => Set<BundleSaleLine>();
+
     // --- Reference data (docs/10 Part C.7) ---
     public DbSet<ReasonCode> ReasonCodes => Set<ReasonCode>();
 
@@ -178,24 +191,44 @@ public class ErpDbContext : DbContext
     // persists the logs without re-auditing them.
     public override async Task<int> SaveChangesAsync(bool acceptAllChangesOnSuccess, CancellationToken ct = default)
     {
-        var pending = AuditScribe.Capture(ChangeTracker);
+        IReadOnlyList<PendingAudit> pending = _writingAuditLogs
+            ? Array.Empty<PendingAudit>()
+            : AuditScribe.Capture(ChangeTracker);
         var result = await base.SaveChangesAsync(acceptAllChangesOnSuccess, ct);
         if (pending.Count > 0)
         {
-            WriteAuditLogs(pending);
-            await base.SaveChangesAsync(acceptAllChangesOnSuccess, ct);
+            try
+            {
+                _writingAuditLogs = true;
+                WriteAuditLogs(pending);
+                await base.SaveChangesAsync(acceptAllChangesOnSuccess, ct);
+            }
+            finally
+            {
+                _writingAuditLogs = false;
+            }
         }
         return result;
     }
 
     public override int SaveChanges(bool acceptAllChangesOnSuccess)
     {
-        var pending = AuditScribe.Capture(ChangeTracker);
+        IReadOnlyList<PendingAudit> pending = _writingAuditLogs
+            ? Array.Empty<PendingAudit>()
+            : AuditScribe.Capture(ChangeTracker);
         var result = base.SaveChanges(acceptAllChangesOnSuccess);
         if (pending.Count > 0)
         {
-            WriteAuditLogs(pending);
-            base.SaveChanges(acceptAllChangesOnSuccess);
+            try
+            {
+                _writingAuditLogs = true;
+                WriteAuditLogs(pending);
+                base.SaveChanges(acceptAllChangesOnSuccess);
+            }
+            finally
+            {
+                _writingAuditLogs = false;
+            }
         }
         return result;
     }

Backend/ERPCore/Infra/Persistence/Migrations/20260716134938_AddBrandsSubcategoriesItemTypesAndProductConfig.cs

@@ -1,442 +0,0 @@
-using System;
-using Microsoft.EntityFrameworkCore.Migrations;
-using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
-
-#nullable disable
-
-namespace ERPCore.Infra.Persistence.Migrations
-{
-    /// <summary>
-    /// Adds the Brand / SubCategory / ItemType masters and the singleton product config,
-    /// and converts CATEGORY from a self-nesting tree into a fixed two-level
-    /// Category → SubCategory hierarchy (docs/10 Part C.1).
-    /// <para>
-    /// <b>This migration carries data, not just DDL.</b> The scaffolded version dropped
-    /// <c>categories.ParentId</c> outright, which would have silently flattened every
-    /// child category into a root and left items pointing at what is now a top-level
-    /// category — losing the parent entirely. The hand-written steps below (marked
-    /// "data migration") move child categories into <c>subcategories</c> and repoint items
-    /// onto the correct (category, subcategory) pair before the column goes away.
-    /// </para>
-    /// </summary>
-    public partial class AddBrandsSubcategoriesItemTypesAndProductConfig : Migration
-    {
-        /// <inheritdoc />
-        protected override void Up(MigrationBuilder migrationBuilder)
-        {
-            // NOTE: the ParentId drop is deliberately deferred to the bottom of this method —
-            // the data migration reads it. Order here is load-bearing.
-            migrationBuilder.RenameColumn(
-                name: "ItemType",
-                table: "items",
-                newName: "StockNature");
-
-            migrationBuilder.AddColumn<int>(
-                name: "BrandId",
-                table: "items",
-                type: "integer",
-                nullable: true);
-
-            migrationBuilder.AddColumn<int>(
-                name: "SubCategoryId",
-                table: "items",
-                type: "integer",
-                nullable: true);
-
-            migrationBuilder.AddColumn<DateTime>(
-                name: "CreatedAt",
-                table: "categories",
-                type: "timestamp with time zone",
-                nullable: false,
-                defaultValue: new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified));
-
-            migrationBuilder.AddColumn<string>(
-                name: "Status",
-                table: "categories",
-                type: "character varying(20)",
-                maxLength: 20,
-                nullable: false,
-                defaultValue: "Active");
-
-            migrationBuilder.AddColumn<DateTime>(
-                name: "UpdatedAt",
-                table: "categories",
-                type: "timestamp with time zone",
-                nullable: true);
-
-            migrationBuilder.AddColumn<uint>(
-                name: "xmin",
-                table: "categories",
-                type: "xid",
-                rowVersion: true,
-                nullable: false,
-                defaultValue: 0u);
-
-            migrationBuilder.CreateTable(
-                name: "brands",
-                columns: table => new
-                {
-                    BrandId = table.Column<int>(type: "integer", nullable: false)
-                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
-                    Name = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: 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_brands", x => x.BrandId);
-                });
-
-            migrationBuilder.CreateTable(
-                name: "item_types",
-                columns: table => new
-                {
-                    ItemTypeId = table.Column<int>(type: "integer", nullable: false)
-                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
-                    Name = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: 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_item_types", x => x.ItemTypeId);
-                });
-
-            migrationBuilder.CreateTable(
-                name: "product_config",
-                columns: table => new
-                {
-                    ConfigId = table.Column<int>(type: "integer", nullable: false),
-                    SubcategoriesEnabled = table.Column<bool>(type: "boolean", nullable: false, defaultValue: true),
-                    BrandsEnabled = table.Column<bool>(type: "boolean", nullable: false, defaultValue: true),
-                    ItemTypesEnabled = table.Column<bool>(type: "boolean", nullable: false, defaultValue: true),
-                    UpdatedAt = table.Column<DateTime>(type: "timestamp with time zone", nullable: true),
-                    UpdatedBy = table.Column<int>(type: "integer", nullable: true),
-                    xmin = table.Column<uint>(type: "xid", rowVersion: true, nullable: false)
-                },
-                constraints: table =>
-                {
-                    table.PrimaryKey("PK_product_config", x => x.ConfigId);
-                    table.CheckConstraint("ck_product_config_singleton", "\"ConfigId\" = 1");
-                    table.ForeignKey(
-                        name: "FK_product_config_users_UpdatedBy",
-                        column: x => x.UpdatedBy,
-                        principalTable: "users",
-                        principalColumn: "UserId",
-                        onDelete: ReferentialAction.Restrict);
-                });
-
-            migrationBuilder.CreateTable(
-                name: "subcategories",
-                columns: table => new
-                {
-                    SubCategoryId = table.Column<int>(type: "integer", nullable: false)
-                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
-                    Name = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: false),
-                    CategoryId = table.Column<int>(type: "integer", nullable: 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_subcategories", x => x.SubCategoryId);
-                    table.ForeignKey(
-                        name: "FK_subcategories_categories_CategoryId",
-                        column: x => x.CategoryId,
-                        principalTable: "categories",
-                        principalColumn: "CategoryId",
-                        onDelete: ReferentialAction.Restrict);
-                });
-
-            // ---------------------------------------------------------------------------
-            // DATA MIGRATION — must run before ParentId is dropped.
-            // ---------------------------------------------------------------------------
-
-            // Existing categories predate CreatedAt; the added column defaulted them to
-            // 0001-01-01. Stamp them with the migration time instead of a sentinel date.
-            migrationBuilder.Sql(@"
-                UPDATE categories SET ""CreatedAt"" = NOW() AT TIME ZONE 'utc';
-            ");
-
-            // Carry the old category id alongside each new subcategory so items can be
-            // repointed by join below. Dropped again once the repoint is done.
-            migrationBuilder.Sql(@"
-                ALTER TABLE subcategories ADD COLUMN legacy_category_id integer;
-            ");
-
-            // Walk the old tree to its roots. The previous model allowed unlimited nesting,
-            // but the new one is exactly two levels — so a category at any depth below the
-            // root collapses into a subcategory of its ROOT ancestor (a grandchild cannot
-            // become a subcategory of its immediate parent, since that parent is itself
-            // ceasing to be a category).
-            migrationBuilder.Sql(@"
-                WITH RECURSIVE tree AS (
-                    SELECT ""CategoryId"", ""ParentId"", ""Name"", ""CategoryId"" AS root_id
-                    FROM categories
-                    WHERE ""ParentId"" IS NULL
-                    UNION ALL
-                    SELECT c.""CategoryId"", c.""ParentId"", c.""Name"", t.root_id
-                    FROM categories c
-                    JOIN tree t ON c.""ParentId"" = t.""CategoryId""
-                )
-                INSERT INTO subcategories (""Name"", ""CategoryId"", ""Status"", ""CreatedAt"", legacy_category_id)
-                SELECT t.""Name"", t.root_id, 'Active', NOW() AT TIME ZONE 'utc', t.""CategoryId""
-                FROM tree t
-                WHERE t.""ParentId"" IS NOT NULL;
-            ");
-
-            // Repoint items: an item that pointed at a child category now carries the root
-            // category plus the subcategory it actually meant.
-            migrationBuilder.Sql(@"
-                UPDATE items i
-                SET ""SubCategoryId"" = s.""SubCategoryId"",
-                    ""CategoryId""    = s.""CategoryId""
-                FROM subcategories s
-                WHERE s.legacy_category_id = i.""CategoryId"";
-            ");
-
-            // The self-FK must go before the delete, or RESTRICT rejects removing a parent
-            // whose own child row is still present.
-            migrationBuilder.DropForeignKey(
-                name: "FK_categories_categories_ParentId",
-                table: "categories");
-
-            // Every non-root category now lives in `subcategories`, and no item references
-            // one any more (repointed above), so the rows can go.
-            migrationBuilder.Sql(@"
-                DELETE FROM categories WHERE ""ParentId"" IS NOT NULL;
-                ALTER TABLE subcategories DROP COLUMN legacy_category_id;
-            ");
-
-            migrationBuilder.DropIndex(
-                name: "IX_categories_ParentId",
-                table: "categories");
-
-            migrationBuilder.DropColumn(
-                name: "ParentId",
-                table: "categories");
-
-            // Seed the singleton config (FR-MD-11) — all features on. Item writes read this
-            // row, so it must exist before the app serves a single request.
-            migrationBuilder.Sql(@"
-                INSERT INTO product_config (""ConfigId"", ""SubcategoriesEnabled"", ""BrandsEnabled"", ""ItemTypesEnabled"")
-                VALUES (1, TRUE, TRUE, TRUE)
-                ON CONFLICT (""ConfigId"") DO NOTHING;
-            ");
-
-            // ---------------------------------------------------------------------------
-
-            migrationBuilder.CreateIndex(
-                name: "IX_items_BrandId",
-                table: "items",
-                column: "BrandId");
-
-            migrationBuilder.CreateIndex(
-                name: "IX_items_SubCategoryId",
-                table: "items",
-                column: "SubCategoryId");
-
-            migrationBuilder.CreateIndex(
-                name: "IX_categories_Name",
-                table: "categories",
-                column: "Name",
-                unique: true);
-
-            migrationBuilder.CreateIndex(
-                name: "IX_categories_Status",
-                table: "categories",
-                column: "Status");
-
-            migrationBuilder.CreateIndex(
-                name: "IX_brands_Name",
-                table: "brands",
-                column: "Name",
-                unique: true);
-
-            migrationBuilder.CreateIndex(
-                name: "IX_brands_Status",
-                table: "brands",
-                column: "Status");
-
-            migrationBuilder.CreateIndex(
-                name: "IX_item_types_Name",
-                table: "item_types",
-                column: "Name",
-                unique: true);
-
-            migrationBuilder.CreateIndex(
-                name: "IX_item_types_Status",
-                table: "item_types",
-                column: "Status");
-
-            migrationBuilder.CreateIndex(
-                name: "IX_product_config_UpdatedBy",
-                table: "product_config",
-                column: "UpdatedBy");
-
-            migrationBuilder.CreateIndex(
-                name: "IX_subcategories_CategoryId_Name",
-                table: "subcategories",
-                columns: new[] { "CategoryId", "Name" },
-                unique: true);
-
-            migrationBuilder.CreateIndex(
-                name: "IX_subcategories_Status",
-                table: "subcategories",
-                column: "Status");
-
-            migrationBuilder.AddForeignKey(
-                name: "FK_items_brands_BrandId",
-                table: "items",
-                column: "BrandId",
-                principalTable: "brands",
-                principalColumn: "BrandId",
-                onDelete: ReferentialAction.Restrict);
-
-            migrationBuilder.AddForeignKey(
-                name: "FK_items_subcategories_SubCategoryId",
-                table: "items",
-                column: "SubCategoryId",
-                principalTable: "subcategories",
-                principalColumn: "SubCategoryId",
-                onDelete: ReferentialAction.Restrict);
-        }
-
-        /// <summary>
-        /// Reverses the schema change and puts the subcategory data back where it came from.
-        /// <para>
-        /// The scaffolded version simply dropped <c>subcategories</c>, which would have
-        /// discarded exactly what <see cref="Up"/> preserved. Instead each subcategory is
-        /// restored as a child category and its items are repointed back onto it. This is
-        /// not perfectly lossless: the old tree's depth is gone (a former grandchild comes
-        /// back as a direct child of its root), and Brand data cannot survive a schema that
-        /// has nowhere to put it.
-        /// </para>
-        /// </summary>
-        protected override void Down(MigrationBuilder migrationBuilder)
-        {
-            migrationBuilder.DropForeignKey(
-                name: "FK_items_brands_BrandId",
-                table: "items");
-
-            migrationBuilder.DropForeignKey(
-                name: "FK_items_subcategories_SubCategoryId",
-                table: "items");
-
-            // Restore the parent column + self-FK first so subcategories have somewhere to
-            // land, then move them back before the table is dropped.
-            migrationBuilder.AddColumn<int>(
-                name: "ParentId",
-                table: "categories",
-                type: "integer",
-                nullable: true);
-
-            // ---------------------------------------------------------------------------
-            // DATA MIGRATION (reverse) — must run before `subcategories` is dropped.
-            // ---------------------------------------------------------------------------
-
-            migrationBuilder.Sql(@"
-                ALTER TABLE categories ADD COLUMN legacy_subcategory_id integer;
-            ");
-
-            // Each subcategory becomes a child category again under the same parent.
-            migrationBuilder.Sql(@"
-                INSERT INTO categories (""Name"", ""ParentId"", ""CreatedAt"", ""Status"", legacy_subcategory_id)
-                SELECT s.""Name"", s.""CategoryId"", s.""CreatedAt"", s.""Status"", s.""SubCategoryId""
-                FROM subcategories s;
-            ");
-
-            // Items that carried a subcategory point back at the restored child category.
-            migrationBuilder.Sql(@"
-                UPDATE items i
-                SET ""CategoryId"" = c.""CategoryId""
-                FROM categories c
-                WHERE c.legacy_subcategory_id = i.""SubCategoryId"";
-            ");
-
-            migrationBuilder.Sql(@"
-                ALTER TABLE categories DROP COLUMN legacy_subcategory_id;
-            ");
-
-            // ---------------------------------------------------------------------------
-
-            migrationBuilder.DropTable(
-                name: "brands");
-
-            migrationBuilder.DropTable(
-                name: "item_types");
-
-            migrationBuilder.DropTable(
-                name: "product_config");
-
-            migrationBuilder.DropTable(
-                name: "subcategories");
-
-            migrationBuilder.DropIndex(
-                name: "IX_items_BrandId",
-                table: "items");
-
-            migrationBuilder.DropIndex(
-                name: "IX_items_SubCategoryId",
-                table: "items");
-
-            migrationBuilder.DropIndex(
-                name: "IX_categories_Name",
-                table: "categories");
-
-            migrationBuilder.DropIndex(
-                name: "IX_categories_Status",
-                table: "categories");
-
-            migrationBuilder.DropColumn(
-                name: "BrandId",
-                table: "items");
-
-            migrationBuilder.DropColumn(
-                name: "SubCategoryId",
-                table: "items");
-
-            migrationBuilder.DropColumn(
-                name: "CreatedAt",
-                table: "categories");
-
-            migrationBuilder.DropColumn(
-                name: "Status",
-                table: "categories");
-
-            migrationBuilder.DropColumn(
-                name: "UpdatedAt",
-                table: "categories");
-
-            migrationBuilder.DropColumn(
-                name: "xmin",
-                table: "categories");
-
-            migrationBuilder.RenameColumn(
-                name: "StockNature",
-                table: "items",
-                newName: "ItemType");
-
-            // ParentId itself was re-added at the top of this method, ahead of the reverse
-            // data migration that populates it.
-            migrationBuilder.CreateIndex(
-                name: "IX_categories_ParentId",
-                table: "categories",
-                column: "ParentId");
-
-            migrationBuilder.AddForeignKey(
-                name: "FK_categories_categories_ParentId",
-                table: "categories",
-                column: "ParentId",
-                principalTable: "categories",
-                principalColumn: "CategoryId",
-                onDelete: ReferentialAction.Restrict);
-        }
-    }
-}

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

@@ -1,22 +0,0 @@
-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

@@ -1,303 +0,0 @@
-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/20260720105238_AddLedgersNavSeed.cs

@@ -1,138 +0,0 @@
-using Microsoft.EntityFrameworkCore.Migrations;
-
-#nullable disable
-
-#pragma warning disable CA1814 // Prefer jagged arrays over multidimensional
-
-namespace ERPCore.Infra.Persistence.Migrations
-{
-    /// <inheritdoc />
-    public partial class AddLedgersNavSeed : Migration
-    {
-        /// <inheritdoc />
-        protected override void Up(MigrationBuilder migrationBuilder)
-        {
-            migrationBuilder.InsertData(
-                table: "nav_items",
-                columns: new[] { "NavItemId", "Code", "Href", "Icon", "Label", "SortOrder" },
-                values: new object[] { 11, "ledgers", "/dashboard/ledgers", null, "Ledgers", 11 });
-
-            migrationBuilder.InsertData(
-                table: "permissions",
-                columns: new[] { "PermissionId", "Code", "NavItemId", "SubNavItemId" },
-                values: new object[] { 19, "NAV:ledgers", 11, null });
-
-            migrationBuilder.InsertData(
-                table: "sub_nav_items",
-                columns: new[] { "SubNavItemId", "Code", "Href", "Icon", "Label", "NavItemId", "SortOrder" },
-                values: new object[,]
-                {
-                    { 9, "ledgers.trial-balance", "/dashboard/ledgers/trial-balance", null, "Trial Balance", 11, 1 },
-                    { 10, "ledgers.balance-sheet", "/dashboard/ledgers/balance-sheet", null, "Balance Sheet", 11, 2 },
-                    { 11, "ledgers.general-ledger", "/dashboard/ledgers/general-ledger", null, "General Ledger", 11, 3 },
-                    { 12, "ledgers.profit-and-loss", "/dashboard/ledgers/profit-and-loss", null, "Profit & Loss", 11, 4 },
-                    { 13, "ledgers.cash-flow", "/dashboard/ledgers/cash-flow", null, "Cash Flow", 11, 5 },
-                    { 14, "ledgers.budget-vs-actual", "/dashboard/ledgers/budget-vs-actual", null, "Budget vs Actual", 11, 6 },
-                    { 15, "ledgers.bank-accounts", "/dashboard/ledgers/bank-accounts", null, "Cash / Bank Accounts", 11, 7 }
-                });
-
-            migrationBuilder.InsertData(
-                table: "permissions",
-                columns: new[] { "PermissionId", "Code", "NavItemId", "SubNavItemId" },
-                values: new object[,]
-                {
-                    { 20, "NAV:ledgers.trial-balance", null, 9 },
-                    { 21, "NAV:ledgers.balance-sheet", null, 10 },
-                    { 22, "NAV:ledgers.general-ledger", null, 11 },
-                    { 23, "NAV:ledgers.profit-and-loss", null, 12 },
-                    { 24, "NAV:ledgers.cash-flow", null, 13 },
-                    { 25, "NAV:ledgers.budget-vs-actual", null, 14 },
-                    { 26, "NAV:ledgers.bank-accounts", null, 15 }
-                });
-        }
-
-        /// <inheritdoc />
-        protected override void Down(MigrationBuilder migrationBuilder)
-        {
-            migrationBuilder.DeleteData(
-                table: "permissions",
-                keyColumn: "PermissionId",
-                keyValue: 19);
-
-            migrationBuilder.DeleteData(
-                table: "permissions",
-                keyColumn: "PermissionId",
-                keyValue: 20);
-
-            migrationBuilder.DeleteData(
-                table: "permissions",
-                keyColumn: "PermissionId",
-                keyValue: 21);
-
-            migrationBuilder.DeleteData(
-                table: "permissions",
-                keyColumn: "PermissionId",
-                keyValue: 22);
-
-            migrationBuilder.DeleteData(
-                table: "permissions",
-                keyColumn: "PermissionId",
-                keyValue: 23);
-
-            migrationBuilder.DeleteData(
-                table: "permissions",
-                keyColumn: "PermissionId",
-                keyValue: 24);
-
-            migrationBuilder.DeleteData(
-                table: "permissions",
-                keyColumn: "PermissionId",
-                keyValue: 25);
-
-            migrationBuilder.DeleteData(
-                table: "permissions",
-                keyColumn: "PermissionId",
-                keyValue: 26);
-
-            migrationBuilder.DeleteData(
-                table: "sub_nav_items",
-                keyColumn: "SubNavItemId",
-                keyValue: 9);
-
-            migrationBuilder.DeleteData(
-                table: "sub_nav_items",
-                keyColumn: "SubNavItemId",
-                keyValue: 10);
-
-            migrationBuilder.DeleteData(
-                table: "sub_nav_items",
-                keyColumn: "SubNavItemId",
-                keyValue: 11);
-
-            migrationBuilder.DeleteData(
-                table: "sub_nav_items",
-                keyColumn: "SubNavItemId",
-                keyValue: 12);
-
-            migrationBuilder.DeleteData(
-                table: "sub_nav_items",
-                keyColumn: "SubNavItemId",
-                keyValue: 13);
-
-            migrationBuilder.DeleteData(
-                table: "sub_nav_items",
-                keyColumn: "SubNavItemId",
-                keyValue: 14);
-
-            migrationBuilder.DeleteData(
-                table: "sub_nav_items",
-                keyColumn: "SubNavItemId",
-                keyValue: 15);
-
-            migrationBuilder.DeleteData(
-                table: "nav_items",
-                keyColumn: "NavItemId",
-                keyValue: 11);
-        }
-    }
-}

Backend/ERPCore/Infra/Persistence/Migrations/20260730061542_AddTaxReportNavSeed.cs

@@ -1,52 +0,0 @@
-using Microsoft.EntityFrameworkCore.Migrations;
-
-#nullable disable
-
-namespace ERPCore.Infra.Persistence.Migrations
-{
-    /// <inheritdoc />
-    public partial class AddTaxReportNavSeed : Migration
-    {
-        /// <inheritdoc />
-        protected override void Up(MigrationBuilder migrationBuilder)
-        {
-            migrationBuilder.UpdateData(
-                table: "sub_nav_items",
-                keyColumn: "SubNavItemId",
-                keyValue: 15,
-                column: "SortOrder",
-                value: 8);
-
-            migrationBuilder.InsertData(
-                table: "sub_nav_items",
-                columns: new[] { "SubNavItemId", "Code", "Href", "Icon", "Label", "NavItemId", "SortOrder" },
-                values: new object[] { 16, "ledgers.tax-report", "/dashboard/ledgers/tax-report", null, "Tax Report", 11, 7 });
-
-            migrationBuilder.InsertData(
-                table: "permissions",
-                columns: new[] { "PermissionId", "Code", "NavItemId", "SubNavItemId" },
-                values: new object[] { 27, "NAV:ledgers.tax-report", null, 16 });
-        }
-
-        /// <inheritdoc />
-        protected override void Down(MigrationBuilder migrationBuilder)
-        {
-            migrationBuilder.DeleteData(
-                table: "permissions",
-                keyColumn: "PermissionId",
-                keyValue: 27);
-
-            migrationBuilder.DeleteData(
-                table: "sub_nav_items",
-                keyColumn: "SubNavItemId",
-                keyValue: 16);
-
-            migrationBuilder.UpdateData(
-                table: "sub_nav_items",
-                keyColumn: "SubNavItemId",
-                keyValue: 15,
-                column: "SortOrder",
-                value: 7);
-        }
-    }
-}

Backend/ERPCore/Infra/Persistence/Migrations/20260730105356_FixProcurementNavIdCollision.cs

@@ -1,82 +0,0 @@
-using Microsoft.EntityFrameworkCore.Migrations;
-
-#nullable disable
-
-#pragma warning disable CA1814 // Prefer jagged arrays over multidimensional
-
-namespace ERPCore.Infra.Persistence.Migrations
-{
-    /// <inheritdoc />
-    public partial class FixProcurementNavIdCollision : Migration
-    {
-        /// <inheritdoc />
-        protected override void Up(MigrationBuilder migrationBuilder)
-        {
-            migrationBuilder.InsertData(
-                table: "sub_nav_items",
-                columns: new[] { "SubNavItemId", "Code", "Href", "Icon", "Label", "NavItemId", "SortOrder" },
-                values: new object[,]
-                {
-                    { 17, "procurement.requisitions", "/dashboard/procurement/requisitions", null, "Requisitions", 4, 1 },
-                    { 18, "procurement.rfqs", "/dashboard/procurement/rfqs", null, "RFQs", 4, 2 },
-                    { 19, "procurement.purchase-orders", "/dashboard/procurement/purchase-orders", null, "Purchase Orders", 4, 3 },
-                    { 20, "procurement.purchase-returns", "/dashboard/procurement/purchase-returns", null, "Purchase Returns", 4, 4 }
-                });
-
-            migrationBuilder.InsertData(
-                table: "permissions",
-                columns: new[] { "PermissionId", "Code", "NavItemId", "SubNavItemId" },
-                values: new object[,]
-                {
-                    { 28, "NAV:procurement.requisitions", null, 17 },
-                    { 29, "NAV:procurement.rfqs", null, 18 },
-                    { 30, "NAV:procurement.purchase-orders", null, 19 },
-                    { 31, "NAV:procurement.purchase-returns", null, 20 }
-                });
-        }
-
-        /// <inheritdoc />
-        protected override void Down(MigrationBuilder migrationBuilder)
-        {
-            migrationBuilder.DeleteData(
-                table: "permissions",
-                keyColumn: "PermissionId",
-                keyValue: 28);
-
-            migrationBuilder.DeleteData(
-                table: "permissions",
-                keyColumn: "PermissionId",
-                keyValue: 29);
-
-            migrationBuilder.DeleteData(
-                table: "permissions",
-                keyColumn: "PermissionId",
-                keyValue: 30);
-
-            migrationBuilder.DeleteData(
-                table: "permissions",
-                keyColumn: "PermissionId",
-                keyValue: 31);
-
-            migrationBuilder.DeleteData(
-                table: "sub_nav_items",
-                keyColumn: "SubNavItemId",
-                keyValue: 17);
-
-            migrationBuilder.DeleteData(
-                table: "sub_nav_items",
-                keyColumn: "SubNavItemId",
-                keyValue: 18);
-
-            migrationBuilder.DeleteData(
-                table: "sub_nav_items",
-                keyColumn: "SubNavItemId",
-                keyValue: 19);
-
-            migrationBuilder.DeleteData(
-                table: "sub_nav_items",
-                keyColumn: "SubNavItemId",
-                keyValue: 20);
-        }
-    }
-}

Backend/ERPCore/Infra/Persistence/Migrations/20260731113219_AddAccountsNavSeed.cs

@@ -1,106 +0,0 @@
-using Microsoft.EntityFrameworkCore.Migrations;
-
-#nullable disable
-
-#pragma warning disable CA1814 // Prefer jagged arrays over multidimensional
-
-namespace ERPCore.Infra.Persistence.Migrations
-{
-    /// <inheritdoc />
-    public partial class AddAccountsNavSeed : Migration
-    {
-        /// <inheritdoc />
-        protected override void Up(MigrationBuilder migrationBuilder)
-        {
-            migrationBuilder.InsertData(
-                table: "nav_items",
-                columns: new[] { "NavItemId", "Code", "Href", "Icon", "Label", "SortOrder" },
-                values: new object[] { 12, "accounts", "/dashboard/accounts", null, "Accounts", 12 });
-
-            migrationBuilder.UpdateData(
-                table: "permissions",
-                keyColumn: "PermissionId",
-                keyValue: 26,
-                column: "Code",
-                value: "NAV:accounts.bank-accounts");
-
-            migrationBuilder.UpdateData(
-                table: "sub_nav_items",
-                keyColumn: "SubNavItemId",
-                keyValue: 15,
-                columns: new[] { "Code", "Href", "NavItemId", "SortOrder" },
-                values: new object[] { "accounts.bank-accounts", "/dashboard/accounts/bank-accounts", 12, 1 });
-
-            migrationBuilder.InsertData(
-                table: "permissions",
-                columns: new[] { "PermissionId", "Code", "NavItemId", "SubNavItemId" },
-                values: new object[] { 32, "NAV:accounts", 12, null });
-
-            migrationBuilder.InsertData(
-                table: "sub_nav_items",
-                columns: new[] { "SubNavItemId", "Code", "Href", "Icon", "Label", "NavItemId", "SortOrder" },
-                values: new object[,]
-                {
-                    { 21, "accounts.cheque-books", "/dashboard/accounts/cheque-books", null, "Cheque Books", 12, 2 },
-                    { 22, "accounts.received-cheques", "/dashboard/accounts/received-cheques", null, "Received Cheques", 12, 3 }
-                });
-
-            migrationBuilder.InsertData(
-                table: "permissions",
-                columns: new[] { "PermissionId", "Code", "NavItemId", "SubNavItemId" },
-                values: new object[,]
-                {
-                    { 33, "NAV:accounts.cheque-books", null, 21 },
-                    { 34, "NAV:accounts.received-cheques", null, 22 }
-                });
-        }
-
-        /// <inheritdoc />
-        protected override void Down(MigrationBuilder migrationBuilder)
-        {
-            migrationBuilder.DeleteData(
-                table: "permissions",
-                keyColumn: "PermissionId",
-                keyValue: 32);
-
-            migrationBuilder.DeleteData(
-                table: "permissions",
-                keyColumn: "PermissionId",
-                keyValue: 33);
-
-            migrationBuilder.DeleteData(
-                table: "permissions",
-                keyColumn: "PermissionId",
-                keyValue: 34);
-
-            migrationBuilder.DeleteData(
-                table: "sub_nav_items",
-                keyColumn: "SubNavItemId",
-                keyValue: 21);
-
-            migrationBuilder.DeleteData(
-                table: "sub_nav_items",
-                keyColumn: "SubNavItemId",
-                keyValue: 22);
-
-            migrationBuilder.DeleteData(
-                table: "nav_items",
-                keyColumn: "NavItemId",
-                keyValue: 12);
-
-            migrationBuilder.UpdateData(
-                table: "permissions",
-                keyColumn: "PermissionId",
-                keyValue: 26,
-                column: "Code",
-                value: "NAV:ledgers.bank-accounts");
-
-            migrationBuilder.UpdateData(
-                table: "sub_nav_items",
-                keyColumn: "SubNavItemId",
-                keyValue: 15,
-                columns: new[] { "Code", "Href", "NavItemId", "SortOrder" },
-                values: new object[] { "ledgers.bank-accounts", "/dashboard/ledgers/bank-accounts", 11, 8 });
-        }
-    }
-}

Backend/ERPCore/Infra/Persistence/Migrations/20260731123720_production.cs

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

Backend/ERPCore/Program.cs

@@ -8,15 +8,17 @@ using ERPCore.Infra.UoW;
 using ERPCore.Repositories;
 using ERPCore.Repositories.Interfaces;
 using ERPCore.Services;
+using ERPCore.Services.Interfaces;
 using ERPCore.Services.Auth;
 using ERPCore.Services.Hrm;
-using ERPCore.Services.Interfaces;
 using ERPCore.Services.Production;
 using ERPCore.Services.Stock;
 using ERPCore.System.Errors;
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Diagnostics;
 using Microsoft.OpenApi;
+using Npgsql;
 using Serilog;
 
 var builder = WebApplication.CreateBuilder(args);
@@ -32,7 +34,10 @@ builder.Services.AddControllers()
 
 // EF Core + PostgreSQL
 builder.Services.AddDbContext<ErpDbContext>(o =>
-    o.UseNpgsql(builder.Configuration.GetConnectionString("DefaultConnection")));
+{
+    o.UseNpgsql(builder.Configuration.GetConnectionString("DefaultConnection"));
+    o.ConfigureWarnings(w => w.Ignore(RelationalEventId.PendingModelChangesWarning));
+});
 
 // ProblemDetails (RFC 7807) + domain-exception mapping
 builder.Services.AddProblemDetails();
@@ -72,11 +77,13 @@ builder.Services.AddScoped<IUnitOfWork, UnitOfWork>();
 builder.Services.AddScoped(typeof(IRepository<>), typeof(Repository<>));
 
 // Master-data services (docs/11 §2)
+builder.Services.AddScoped<ICustomerService, CustomerService>();
 builder.Services.AddScoped<IItemService, ItemService>();
 builder.Services.AddScoped<IUomService, UomService>();
 builder.Services.AddScoped<ICategoryService, CategoryService>();
 builder.Services.AddScoped<IBrandService, BrandService>();
 builder.Services.AddScoped<IItemTypeService, ItemTypeService>();
+//builder.Services.AddScoped<ICompanyProfileService, CompanyProfileService>();
 builder.Services.AddScoped<IProductConfigService, ProductConfigService>();
 builder.Services.AddScoped<IVendorService, VendorService>();
 builder.Services.AddScoped<IWarehouseService, WarehouseService>();
@@ -97,6 +104,18 @@ builder.Services.AddScoped<IFifoCostingService, FifoCostingService>();
 builder.Services.AddScoped<IStockService, StockService>();
 builder.Services.AddScoped<IGrnService, GrnService>();
 
+// Sales (Phase 1)
+builder.Services.AddScoped<ISalesPricingService, SalesPricingService>();
+builder.Services.AddScoped<ISalesDomainService, SalesDomainService>();
+builder.Services.AddScoped<ISalesPostingService, SalesPostingService>();
+builder.Services.AddScoped<ISalesDocumentWorkflowService, SalesDocumentWorkflowService>();
+builder.Services.AddScoped<ISalesMappingService, SalesMappingService>();
+builder.Services.AddScoped<ISalesInvoiceService, SalesInvoiceService>();
+builder.Services.AddScoped<ISalesSlipService, SalesSlipService>();
+builder.Services.AddScoped<IBundleSaleService, BundleSaleService>();
+builder.Services.AddScoped<ISalesPromotionSuggestionService, SalesPromotionSuggestionService>();
+builder.Services.AddScoped<ISalesReportService, SalesReportService>();
+
 // Stock transactions + reference data (docs/11 §5–6)
 builder.Services.AddScoped<IStockMutator, StockMutator>();
 builder.Services.AddScoped<IReasonCodeService, ReasonCodeService>();
@@ -171,7 +190,16 @@ var app = builder.Build();
 using (var scope = app.Services.CreateScope())
 {
     var db = scope.ServiceProvider.GetRequiredService<ErpDbContext>();
-    await DataSeeder.SeedAsync(db);
+   // await EnsureMigrationBaselineAsync(db);
+    await db.Database.MigrateAsync();
+    try
+    {
+        await DataSeeder.SeedAsync(db);
+    }
+    catch (Exception ex)
+    {
+        throw new InvalidOperationException("Database migration succeeded, but startup seeding failed.", ex);
+    }
 }
 
 app.UseSerilogRequestLogging();
@@ -188,3 +216,4 @@ app.UseAuthorization();
 app.MapControllers();
 app.MapHealthChecks("/health");
 app.Run();
+

Backend/ERPCore/Services/BundleSaleService.cs

@@ -0,0 +1,250 @@
+using ERPCore.Domain;
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Sales;
+using ERPCore.Infra.Auth;
+using ERPCore.Infra.UoW;
+using ERPCore.Repositories.Interfaces;
+using ERPCore.Services.Interfaces;
+using ERPCore.Services.Stock;
+using ERPCore.System.Errors;
+using Microsoft.EntityFrameworkCore;
+
+namespace ERPCore.Services;
+
+public sealed class BundleSaleService : IBundleSaleService
+{
+    private readonly IRepository<BundleSaleTemplate> _templates;
+    private readonly IRepository<BundleSale> _bundles;
+    private readonly IRepository<Customer> _customers;
+    private readonly IRepository<Item> _items;
+    private readonly IRepository<Uom> _uoms;
+    private readonly IRepository<Warehouse> _warehouses;
+    private readonly IRepository<User> _users;
+    private readonly ISalesDomainService _sales;
+    private readonly ISalesPostingService _posting;
+    private readonly ICurrentUser _currentUser;
+    private readonly INumberSequenceService _numbers;
+    private readonly IUnitOfWork _uow;
+
+    public BundleSaleService(
+        IRepository<BundleSale> bundles,
+        IRepository<BundleSaleTemplate> templates,
+        IRepository<Customer> customers,
+        IRepository<Item> items,
+        IRepository<Uom> uoms,
+        IRepository<Warehouse> warehouses,
+        IRepository<User> users,
+        ISalesDomainService sales,
+        ISalesPostingService posting,
+        ICurrentUser currentUser,
+        INumberSequenceService numbers,
+        IUnitOfWork uow)
+    {
+        _templates = templates;
+        _bundles = bundles;
+        _customers = customers;
+        _items = items;
+        _uoms = uoms;
+        _warehouses = warehouses;
+        _users = users;
+        _sales = sales;
+        _posting = posting;
+        _currentUser = currentUser;
+        _numbers = numbers;
+        _uow = uow;
+    }
+
+    public async Task<PagedResponse<BundleSaleTemplateSummaryDto>> ListTemplatesAsync(PageQuery query, CancellationToken ct = default)
+    {
+        IQueryable<BundleSaleTemplate> q = _templates.Query().AsNoTracking().Include(x => x.Lines);
+        if (!string.IsNullOrWhiteSpace(query.Q))
+        {
+            var term = query.Q.Trim();
+            q = q.Where(x => EF.Functions.ILike(x.TemplateCode, $"%{term}%") || EF.Functions.ILike(x.TemplateName, $"%{term}%") || EF.Functions.ILike(x.Description ?? "", $"%{term}%"));
+        }
+        var total = await q.CountAsync(ct);
+        var rows = await q.OrderByDescending(x => x.BundleSaleTemplateId).Skip(query.Skip).Take(query.PageSize).ToListAsync(ct);
+        return PagedResponse<BundleSaleTemplateSummaryDto>.Create(rows.Select(x => new BundleSaleTemplateSummaryDto(
+            x.BundleSaleTemplateId, x.TemplateCode, x.TemplateName, x.Description, x.Status, x.Lines.Count, x.CreatedAt, x.UpdatedAt)).ToList(), query.Page, query.PageSize, total);
+    }
+
+    public async Task<BundleSaleTemplateDto?> GetTemplateAsync(int bundleSaleTemplateId, CancellationToken ct = default)
+    {
+        var template = await _templates.Query().AsNoTracking().Include(x => x.Lines).FirstOrDefaultAsync(x => x.BundleSaleTemplateId == bundleSaleTemplateId, ct);
+        return template is null ? null : new BundleSaleTemplateDto(
+            template.BundleSaleTemplateId,
+            template.TemplateCode,
+            template.TemplateName,
+            template.Description,
+            template.Status,
+            template.CreatedAt,
+            template.UpdatedAt,
+            template.Lines.OrderBy(x => x.SortOrder).Select(x => new BundleSaleTemplateLineDto(
+                x.BundleSaleTemplateLineId, x.ItemId, x.UomId, x.WarehouseId, x.Qty, x.UnitPrice, x.IncludeInBundle, x.SortOrder)).ToList());
+    }
+
+    public async Task<PagedResponse<BundleSaleSummaryDto>> ListAsync(PageQuery query, int? customerId, int? warehouseId, CancellationToken ct = default)
+    {
+        IQueryable<BundleSale> q = _bundles.Query().AsNoTracking().Include(x => x.Lines);
+        if (!string.IsNullOrWhiteSpace(query.Q))
+        {
+            var term = query.Q.Trim();
+            q = q.Where(x => EF.Functions.ILike(x.BundleNo, $"%{term}%") || EF.Functions.ILike(x.BundleName, $"%{term}%") || EF.Functions.ILike(x.BundleCode, $"%{term}%"));
+        }
+        if (customerId is not null) q = q.Where(x => x.CustomerId == customerId);
+        if (warehouseId is not null) q = q.Where(x => x.WarehouseId == warehouseId);
+        var total = await q.CountAsync(ct);
+        var rows = await q.OrderByDescending(x => x.BundleSaleId).Skip(query.Skip).Take(query.PageSize).ToListAsync(ct);
+        return PagedResponse<BundleSaleSummaryDto>.Create(rows.Select(MapSummary).ToList(), query.Page, query.PageSize, total);
+    }
+
+    public async Task<BundleSaleDto?> GetAsync(int bundleSaleId, CancellationToken ct = default)
+    {
+        var bundle = await _bundles.Query().AsNoTracking().Include(x => x.Lines).FirstOrDefaultAsync(x => x.BundleSaleId == bundleSaleId, ct);
+        return bundle is null ? null : Map(bundle);
+    }
+
+    public Task<BundleSalePostingCheckDto> CheckPostingAsync(int bundleSaleId, CancellationToken ct = default)
+        => _posting.CheckBundleAsync(bundleSaleId, ct);
+
+    public async Task<BundleSaleDto> CreateAsync(CreateBundleSaleRequest request, CancellationToken ct = default)
+    {
+        await _sales.ValidateSalesHeaderAsync(request.CustomerId, request.WarehouseId, request.CashierUserId, true, ct);
+        var template = await _templates.Query().AsNoTracking().Include(x => x.Lines)
+            .FirstAsync(x => x.BundleSaleTemplateId == request.BundleSaleTemplateId, ct);
+        var bundle = new BundleSale
+        {
+            BundleNo = await _numbers.NextAsync(DocumentTypes.BundleSale, ct),
+            BundleDate = DateTime.UtcNow,
+            CustomerId = request.CustomerId,
+            WarehouseId = request.WarehouseId,
+            CashierUserId = request.CashierUserId,
+            BundleSaleTemplateId = request.BundleSaleTemplateId,
+            BundleName = request.BundleName,
+            BundleCode = string.Empty,
+            Status = BundleSaleStatus.Draft,
+            CreatedAt = DateTime.UtcNow
+        };
+        bundle.CustomerSnapshotName = await _customers.Query().Where(x => x.CustomerId == request.CustomerId).Select(x => x.DisplayName ?? x.Name).FirstAsync(ct);
+        bundle.Lines = await BuildLinesAsync(template, request.WarehouseId, request.Lines, ct);
+        Recalculate(bundle, request.BundlePrice);
+        bundle.BundleCode = $"{bundle.BundleNo}-B";
+        await _bundles.AddAsync(bundle, ct);
+        bundle.ConcurrencyStamp = 1;
+        await _uow.SaveChangesAsync(ct);
+        return Map(bundle);
+    }
+
+    public async Task<BundleSaleDto> UpdateAsync(int bundleSaleId, UpdateBundleSaleRequest request, CancellationToken ct = default)
+    {
+        var bundle = await _bundles.Query().Include(x => x.Lines).FirstOrDefaultAsync(x => x.BundleSaleId == bundleSaleId, ct)
+            ?? throw new NotFoundException($"Bundle sale {bundleSaleId} was not found.");
+        if (bundle.Status != BundleSaleStatus.Draft)
+            throw new ConflictException($"Bundle sale {bundleSaleId} is {bundle.Status} and cannot be edited.");
+
+        await _sales.ValidateSalesHeaderAsync(request.CustomerId, request.WarehouseId, request.CashierUserId, true, ct);
+        var template = await _templates.Query().AsNoTracking().Include(x => x.Lines)
+            .FirstAsync(x => x.BundleSaleTemplateId == request.BundleSaleTemplateId, ct);
+        bundle.CustomerId = request.CustomerId;
+        bundle.WarehouseId = request.WarehouseId;
+        bundle.CashierUserId = request.CashierUserId;
+        bundle.BundleSaleTemplateId = request.BundleSaleTemplateId;
+        bundle.BundleName = request.BundleName;
+        bundle.CustomerSnapshotName = await _customers.Query().Where(x => x.CustomerId == request.CustomerId).Select(x => x.DisplayName ?? x.Name).FirstAsync(ct);
+        bundle.Lines.Clear();
+        foreach (var line in await BuildLinesAsync(template, request.WarehouseId, request.Lines, ct)) bundle.Lines.Add(line);
+        Recalculate(bundle, request.BundlePrice);
+        bundle.UpdatedAt = DateTime.UtcNow;
+        bundle.ConcurrencyStamp++;
+        await _uow.SaveChangesAsync(ct);
+        return Map(bundle);
+    }
+
+    public async Task<BundleSaleDto> PostAsync(int bundleSaleId, CancellationToken ct = default)
+        {
+            await _posting.PostBundleAsync(bundleSaleId, ct);
+            var bundle = await _bundles.Query().AsNoTracking().Include(x => x.Lines)
+                .FirstAsync(x => x.BundleSaleId == bundleSaleId, ct);
+            return Map(bundle);
+        }
+
+    public async Task<BundleSaleDto> CancelAsync(int bundleSaleId, CancellationToken ct = default)
+    {
+        var bundle = await _bundles.Query().Include(x => x.Lines).FirstOrDefaultAsync(x => x.BundleSaleId == bundleSaleId, ct)
+            ?? throw new NotFoundException($"Bundle sale {bundleSaleId} was not found.");
+        if (bundle.Status != BundleSaleStatus.Draft)
+            throw new ConflictException($"Bundle sale {bundleSaleId} is {bundle.Status} and cannot be cancelled.");
+        bundle.Status = BundleSaleStatus.Cancelled;
+        bundle.UpdatedAt = DateTime.UtcNow;
+        bundle.ConcurrencyStamp++;
+        await _uow.SaveChangesAsync(ct);
+        return Map(bundle);
+    }
+
+    private async Task<List<BundleSaleLine>> BuildLinesAsync(
+        BundleSaleTemplate template, int warehouseId, IReadOnlyList<CreateBundleSaleTemplateLineRequest> requestLines, CancellationToken ct)
+    {
+        var lines = new List<BundleSaleLine>();
+        var sourceLines = requestLines.Count > 0
+            ? requestLines.OrderBy(x => x.SortOrder).ToList()
+            : template.Lines.OrderBy(x => x.SortOrder).Select(x => new CreateBundleSaleTemplateLineRequest
+            {
+                ItemId = x.ItemId,
+                UomId = x.UomId,
+                WarehouseId = x.WarehouseId,
+                Qty = x.Qty,
+                UnitPrice = x.UnitPrice,
+                IncludeInBundle = x.IncludeInBundle,
+                SortOrder = x.SortOrder
+            }).ToList();
+
+        foreach (var r in sourceLines)
+        {
+            if (r.Qty <= 0)
+                throw new DomainException(ErrorCodes.Validation, "Bundle line quantity must be greater than zero.", 422);
+            if (r.WarehouseId != warehouseId)
+                throw new DomainException(ErrorCodes.Validation,
+                    $"Bundle line warehouse {r.WarehouseId} must match header warehouse {warehouseId}.", 422);
+            var item = await _items.Query().AsNoTracking().FirstAsync(x => x.ItemId == r.ItemId, ct);
+            await _sales.ValidateSalesLineAsync(warehouseId, r.ItemId, r.UomId, r.WarehouseId, r.Qty, 0m, null, ct);
+            var resolved = await _sales.ResolveLinePriceAsync(r.ItemId, r.WarehouseId, r.UnitPrice, true, ct);
+            var calc = _sales.ComputeLine(r.Qty, 0m, resolved.UnitPrice, SalesDiscountMode.Amount, 0m, 0m, 0m, 0m, false);
+            lines.Add(new BundleSaleLine
+            {
+                ItemId = r.ItemId,
+                Description = item.Name,
+                Qty = r.Qty,
+                UomId = r.UomId,
+                WarehouseId = r.WarehouseId,
+                UnitPrice = resolved.UnitPrice,
+                LineTotal = calc.LineTotal,
+                IncludeInBundle = r.IncludeInBundle,
+                IsComponent = true,
+                ParentLineId = null
+            });
+        }
+        return lines;
+    }
+
+    private static void Recalculate(BundleSale bundle, decimal bundlePrice)
+    {
+        bundle.ComponentSubtotal = bundle.Lines.Where(x => x.IncludeInBundle).Sum(x => x.LineTotal);
+        bundle.BundlePrice = bundlePrice;
+        bundle.MarginAmount = bundle.BundlePrice - bundle.ComponentSubtotal;
+        bundle.DiscountTotal = Math.Max(0m, bundle.ComponentSubtotal - bundle.BundlePrice);
+        bundle.TaxTotal = 0m;
+        bundle.GrandTotal = bundle.BundlePrice + bundle.TaxTotal;
+    }
+
+    private static BundleSaleSummaryDto MapSummary(BundleSale x) => new(
+        x.BundleSaleId, x.BundleNo, x.BundleDate, x.CustomerId, x.CustomerSnapshotName, x.WarehouseId, x.BundleName, x.BundleCode, x.Status, x.ComponentSubtotal, x.BundlePrice, x.GrandTotal, x.CreatedAt);
+
+    private static BundleSaleDto Map(BundleSale x) => new(
+        x.BundleSaleId, x.BundleNo, x.BundleDate, x.CustomerId, x.CustomerSnapshotName, x.WarehouseId, x.CashierUserId, x.BundleSaleTemplateId,
+        x.BundleName, x.BundleCode, x.Status, x.ComponentSubtotal, x.BundlePrice, x.MarginAmount, x.DiscountTotal, x.TaxTotal, x.GrandTotal,
+        x.CreatedAt, x.UpdatedAt,
+        x.Lines.Select(l => new BundleSaleLineDto(l.BundleSaleLineId, l.ItemId, l.Description, l.Qty, l.UomId, l.WarehouseId, l.UnitPrice, l.LineTotal, l.IncludeInBundle, l.IsComponent, l.ParentLineId)).ToList());
+
+}

Backend/ERPCore/Services/CustomerService.cs

@@ -0,0 +1,168 @@
+using ERPCore.Common.Http;
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Customers;
+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 CustomerService : ICustomerService
+{
+    private readonly IRepository<Customer> _customers;
+    private readonly IRepository<Warehouse> _warehouses;
+    private readonly IUnitOfWork _uow;
+
+    public CustomerService(IRepository<Customer> customers, IRepository<Warehouse> warehouses, IUnitOfWork uow)
+    {
+        _customers = customers;
+        _warehouses = warehouses;
+        _uow = uow;
+    }
+
+    public async Task<PagedResponse<CustomerDto>> ListAsync(PageQuery query, EntityStatus? status, CustomerType? customerType, CancellationToken ct = default)
+    {
+        var q = _customers.Query().AsNoTracking();
+        if (!string.IsNullOrWhiteSpace(query.Q))
+        {
+            var term = query.Q.Trim();
+            q = q.Where(c => EF.Functions.ILike(c.Name, $"%{term}%")
+                             || EF.Functions.ILike(c.CustomerCode, $"%{term}%")
+                             || (c.DisplayName != null && EF.Functions.ILike(c.DisplayName, $"%{term}%")));
+        }
+        if (status is not null) q = q.Where(c => c.Status == status);
+        if (customerType is not null) q = q.Where(c => c.CustomerType == customerType);
+
+        var total = await q.CountAsync(ct);
+        var rows = await q.OrderBy(c => c.Name)
+            .Skip(query.Skip).Take(query.PageSize)
+            .Select(c => new CustomerDto(
+                c.CustomerId, c.CustomerCode, c.CustomerType, c.Name, c.DisplayName, c.Phone, c.Email,
+                c.AddressLine1, c.AddressLine2, c.City, c.Country, c.TaxRegistrationNo,
+                c.CreditLimit, c.CreditDays, c.DefaultWarehouseId, c.Status, c.CreatedAt, c.UpdatedAt))
+            .ToListAsync(ct);
+
+        return PagedResponse<CustomerDto>.Create(rows, query.Page, query.PageSize, total);
+    }
+
+    public async Task<ETagged<CustomerDto>?> GetAsync(int customerId, CancellationToken ct = default)
+    {
+        var customer = await _customers.Query().AsNoTracking()
+            .FirstOrDefaultAsync(c => c.CustomerId == customerId, ct);
+        return customer is null ? null : new ETagged<CustomerDto>(Map(customer), customer.RowVersion);
+    }
+
+    public async Task<ETagged<CustomerDto>> CreateAsync(CreateCustomerRequest request, CancellationToken ct = default)
+    {
+        var code = request.CustomerCode.Trim();
+        var name = request.Name.Trim();
+
+        if (await _customers.Query().AnyAsync(c => c.CustomerCode.ToLower() == code.ToLower(), ct))
+            throw new ConflictException($"A customer code '{code}' already exists.");
+
+        if (!string.IsNullOrWhiteSpace(request.Email))
+        {
+            var email = request.Email.Trim();
+            if (await _customers.Query().AnyAsync(c => c.Email != null && c.Email.ToLower() == email.ToLower(), ct))
+                throw new ConflictException($"A customer with email '{email}' already exists.");
+        }
+
+        if (request.DefaultWarehouseId is not null)
+        {
+            var exists = await _warehouses.Query().AnyAsync(w => w.WarehouseId == request.DefaultWarehouseId, ct);
+            if (!exists) throw new NotFoundException($"Warehouse {request.DefaultWarehouseId} was not found.");
+        }
+
+        var customer = new Customer
+        {
+            CustomerCode = code,
+            CustomerType = request.CustomerType,
+            Name = name,
+            DisplayName = Normalize(request.DisplayName),
+            Phone = Normalize(request.Phone),
+            Email = Normalize(request.Email),
+            AddressLine1 = Normalize(request.AddressLine1),
+            AddressLine2 = Normalize(request.AddressLine2),
+            City = Normalize(request.City),
+            Country = Normalize(request.Country),
+            TaxRegistrationNo = Normalize(request.TaxRegistrationNo),
+            CreditLimit = request.CreditLimit,
+            CreditDays = request.CreditDays,
+            DefaultWarehouseId = request.DefaultWarehouseId,
+            Status = EntityStatus.Active,
+            CreatedAt = DateTime.UtcNow
+        };
+
+        await _customers.AddAsync(customer, ct);
+        await _uow.SaveChangesAsync(ct);
+
+        return new ETagged<CustomerDto>(Map(customer), customer.RowVersion);
+    }
+
+    public async Task<ETagged<CustomerDto>> UpdateAsync(int customerId, UpdateCustomerRequest request, uint expectedRowVersion, CancellationToken ct = default)
+    {
+        var customer = await _customers.GetByIdAsync(customerId, ct)
+            ?? throw new NotFoundException($"Customer {customerId} was not found.");
+
+        if (customer.RowVersion != expectedRowVersion)
+            throw new DomainException(ErrorCodes.ConcurrencyConflict, "The customer was modified by another request.", 412);
+
+        var code = request.CustomerCode.Trim();
+        var name = request.Name.Trim();
+
+        if (!string.Equals(customer.CustomerCode, code, StringComparison.Ordinal)
+            && await _customers.Query().AnyAsync(c => c.CustomerCode.ToLower() == code.ToLower() && c.CustomerId != customerId, ct))
+            throw new ConflictException($"A customer code '{code}' already exists.");
+
+        if (!string.Equals(customer.Email, request.Email?.Trim(), StringComparison.OrdinalIgnoreCase)
+            && !string.IsNullOrWhiteSpace(request.Email)
+            && await _customers.Query().AnyAsync(c => c.Email != null && c.Email.ToLower() == request.Email!.Trim().ToLower() && c.CustomerId != customerId, ct))
+            throw new ConflictException($"A customer with email '{request.Email.Trim()}' already exists.");
+
+        if (request.DefaultWarehouseId is not null)
+        {
+            var exists = await _warehouses.Query().AnyAsync(w => w.WarehouseId == request.DefaultWarehouseId, ct);
+            if (!exists) throw new NotFoundException($"Warehouse {request.DefaultWarehouseId} was not found.");
+        }
+
+        customer.CustomerCode = code;
+        customer.CustomerType = request.CustomerType;
+        customer.Name = name;
+        customer.DisplayName = Normalize(request.DisplayName);
+        customer.Phone = Normalize(request.Phone);
+        customer.Email = Normalize(request.Email);
+        customer.AddressLine1 = Normalize(request.AddressLine1);
+        customer.AddressLine2 = Normalize(request.AddressLine2);
+        customer.City = Normalize(request.City);
+        customer.Country = Normalize(request.Country);
+        customer.TaxRegistrationNo = Normalize(request.TaxRegistrationNo);
+        customer.CreditLimit = request.CreditLimit;
+        customer.CreditDays = request.CreditDays;
+        customer.DefaultWarehouseId = request.DefaultWarehouseId;
+        customer.UpdatedAt = DateTime.UtcNow;
+
+        await _uow.SaveChangesAsync(ct);
+        return new ETagged<CustomerDto>(Map(customer), customer.RowVersion);
+    }
+
+    public async Task SetStatusAsync(int customerId, EntityStatus status, CancellationToken ct = default)
+    {
+        var customer = await _customers.GetByIdAsync(customerId, ct)
+            ?? throw new NotFoundException($"Customer {customerId} was not found.");
+
+        customer.Status = status;
+        customer.UpdatedAt = DateTime.UtcNow;
+        await _uow.SaveChangesAsync(ct);
+    }
+
+    private static CustomerDto Map(Customer c) => new(
+        c.CustomerId, c.CustomerCode, c.CustomerType, c.Name, c.DisplayName, c.Phone, c.Email,
+        c.AddressLine1, c.AddressLine2, c.City, c.Country, c.TaxRegistrationNo,
+        c.CreditLimit, c.CreditDays, c.DefaultWarehouseId, c.Status, c.CreatedAt, c.UpdatedAt);
+
+    private static string? Normalize(string? value) => string.IsNullOrWhiteSpace(value) ? null : value.Trim();
+}

Backend/ERPCore/Services/Interfaces/IBundleSaleService.cs

@@ -0,0 +1,18 @@
+using ERPCore.Common.Http;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Sales;
+
+namespace ERPCore.Services.Interfaces;
+
+public interface IBundleSaleService
+{
+    Task<PagedResponse<BundleSaleTemplateSummaryDto>> ListTemplatesAsync(PageQuery query, CancellationToken ct = default);
+    Task<BundleSaleTemplateDto?> GetTemplateAsync(int bundleSaleTemplateId, CancellationToken ct = default);
+    Task<PagedResponse<BundleSaleSummaryDto>> ListAsync(PageQuery query, int? customerId, int? warehouseId, CancellationToken ct = default);
+    Task<BundleSaleDto?> GetAsync(int bundleSaleId, CancellationToken ct = default);
+    Task<BundleSalePostingCheckDto> CheckPostingAsync(int bundleSaleId, CancellationToken ct = default);
+    Task<BundleSaleDto> CreateAsync(CreateBundleSaleRequest request, CancellationToken ct = default);
+    Task<BundleSaleDto> UpdateAsync(int bundleSaleId, UpdateBundleSaleRequest request, CancellationToken ct = default);
+    Task<BundleSaleDto> PostAsync(int bundleSaleId, CancellationToken ct = default);
+    Task<BundleSaleDto> CancelAsync(int bundleSaleId, CancellationToken ct = default);
+}

Backend/ERPCore/Services/Interfaces/ICustomerService.cs

@@ -0,0 +1,15 @@
+using ERPCore.Common.Http;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Customers;
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Services.Interfaces;
+
+public interface ICustomerService
+{
+    Task<PagedResponse<CustomerDto>> ListAsync(PageQuery query, EntityStatus? status, CustomerType? customerType, CancellationToken ct = default);
+    Task<ETagged<CustomerDto>?> GetAsync(int customerId, CancellationToken ct = default);
+    Task<ETagged<CustomerDto>> CreateAsync(CreateCustomerRequest request, CancellationToken ct = default);
+    Task<ETagged<CustomerDto>> UpdateAsync(int customerId, UpdateCustomerRequest request, uint expectedRowVersion, CancellationToken ct = default);
+    Task SetStatusAsync(int customerId, EntityStatus status, CancellationToken ct = default);
+}

Backend/ERPCore/Services/Interfaces/ISalesDocumentWorkflowService.cs

@@ -0,0 +1,9 @@
+using ERPCore.Domain.Entities;
+
+namespace ERPCore.Services.Interfaces;
+
+public interface ISalesDocumentWorkflowService
+{
+    Task<SalesInvoice> LoadEditableInvoiceAsync(int salesInvoiceId, uint expectedRowVersion, CancellationToken ct = default);
+    Task<SalesSlip> LoadEditableSlipAsync(int salesSlipId, uint expectedRowVersion, CancellationToken ct = default);
+}

Backend/ERPCore/Services/Interfaces/ISalesDomainService.cs

@@ -0,0 +1,51 @@
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Sales;
+
+namespace ERPCore.Services.Interfaces;
+
+public interface ISalesDomainService
+{
+    Task ValidateSalesHeaderAsync(
+        int customerId,
+        int warehouseId,
+        int? cashierUserId,
+        bool requireCashierUser,
+        CancellationToken ct = default);
+
+    Task ValidateSalesLineAsync(
+        int headerWarehouseId,
+        int lineItemId,
+        int lineUomId,
+        int lineWarehouseId,
+        decimal qty,
+        decimal freeQty,
+        int? parentLineId,
+        CancellationToken ct = default);
+
+    Task<SalesPriceResolution> ResolveLinePriceAsync(
+        int itemId,
+        int warehouseId,
+        decimal? requestedUnitPrice,
+        bool allowManualOverride,
+        CancellationToken ct = default);
+
+    SalesLineComputation ComputeLine(
+        decimal qty,
+        decimal freeQty,
+        decimal unitPrice,
+        SalesDiscountMode discountMode,
+        decimal discountPct,
+        decimal discountValue,
+        decimal discountAmount,
+        decimal taxPct,
+        bool isFreeIssue);
+
+    Task<bool> IsStockedItemAsync(int itemId, CancellationToken ct = default);
+}
+
+public sealed record SalesLineComputation(
+    decimal Gross,
+    decimal DiscountTotal,
+    decimal NetUnitPrice,
+    decimal LineTotal,
+    decimal TaxAmount);

Backend/ERPCore/Services/Interfaces/ISalesInvoiceService.cs

@@ -0,0 +1,17 @@
+using ERPCore.Common.Http;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Sales;
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Services.Interfaces;
+
+public interface ISalesInvoiceService
+{
+    Task<PagedResponse<SalesInvoiceSummaryDto>> ListAsync(PageQuery query, SalesInvoiceStatus? status, int? customerId, int? warehouseId, CancellationToken ct = default);
+    Task<ETagged<SalesInvoiceDto>?> GetAsync(int salesInvoiceId, CancellationToken ct = default);
+    Task<SalesInvoicePostingCheckDto> CheckPostingAsync(int salesInvoiceId, CancellationToken ct = default);
+    Task<ETagged<SalesInvoiceDto>> CreateAsync(CreateSalesInvoiceRequest request, CancellationToken ct = default);
+    Task<ETagged<SalesInvoiceDto>> UpdateAsync(int salesInvoiceId, UpdateSalesInvoiceRequest request, uint expectedRowVersion, CancellationToken ct = default);
+    Task<SalesInvoiceDto> PostAsync(int salesInvoiceId, CancellationToken ct = default);
+    Task<SalesInvoiceDto> CancelAsync(int salesInvoiceId, CancellationToken ct = default);
+}

Backend/ERPCore/Services/Interfaces/ISalesMappingService.cs

@@ -0,0 +1,12 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Dtos.Sales;
+
+namespace ERPCore.Services.Interfaces;
+
+public interface ISalesMappingService
+{
+    SalesInvoiceTotalsDto MapInvoiceTotals(SalesInvoice invoice);
+    SalesSlipTotalsDto MapSlipTotals(SalesSlip slip);
+    SalesInvoiceDto MapInvoice(SalesInvoice invoice);
+    SalesSlipDto MapSlip(SalesSlip slip);
+}

Backend/ERPCore/Services/Interfaces/ISalesPostingService.cs

@@ -0,0 +1,14 @@
+using ERPCore.Dtos.Sales;
+
+namespace ERPCore.Services.Interfaces;
+
+public interface ISalesPostingService
+{
+    Task<SalesInvoicePostingCheckDto> CheckInvoiceAsync(int salesInvoiceId, CancellationToken ct = default);
+    Task<SalesSlipPostingCheckDto> CheckSlipAsync(int salesSlipId, CancellationToken ct = default);
+    Task<BundleSalePostingCheckDto> CheckBundleAsync(int bundleSaleId, CancellationToken ct = default);
+
+    Task PostInvoiceAsync(int salesInvoiceId, CancellationToken ct = default);
+    Task PostSlipAsync(int salesSlipId, CancellationToken ct = default);
+    Task PostBundleAsync(int bundleSaleId, CancellationToken ct = default);
+}

Backend/ERPCore/Services/Interfaces/ISalesPricingService.cs

@@ -0,0 +1,16 @@
+namespace ERPCore.Services.Interfaces;
+
+public interface ISalesPricingService
+{
+    Task<SalesPriceResolution> ResolveAsync(
+        int itemId,
+        int warehouseId,
+        decimal? requestedUnitPrice,
+        bool allowManualOverride,
+        CancellationToken ct = default);
+}
+
+public sealed record SalesPriceResolution(
+    decimal UnitPrice,
+    string PriceSource,
+    decimal BaseCost);

Backend/ERPCore/Services/Interfaces/ISalesPromotionSuggestionService.cs

@@ -0,0 +1,8 @@
+using ERPCore.Dtos.Sales;
+
+namespace ERPCore.Services.Interfaces;
+
+public interface ISalesPromotionSuggestionService
+{
+    Task<SalesFreeIssueSuggestionDto?> GetFreeIssueSuggestionsAsync(int salesSlipId, CancellationToken ct = default);
+}

Backend/ERPCore/Services/Interfaces/ISalesReportService.cs

@@ -0,0 +1,16 @@
+using ERPCore.Dtos.Sales;
+
+namespace ERPCore.Services.Interfaces;
+
+public interface ISalesReportService
+{
+    IReadOnlyList<SalesReportDefinitionDto> ListReports();
+    SalesReportDefinitionDto? GetReport(string reportId);
+    Task<IReadOnlyList<object>> QueryAsync(string reportType, DateOnly from, DateOnly to, int? itemId, int? customerId, int? warehouseId, CancellationToken ct = default);
+    Task<IReadOnlyList<SalesDailySummaryRowDto>> DailySummaryAsync(DateOnly from, DateOnly to, CancellationToken ct = default);
+    Task<IReadOnlyList<SalesItemSummaryRowDto>> ItemSummaryAsync(DateOnly from, DateOnly to, int? itemId, int? warehouseId, CancellationToken ct = default);
+    Task<IReadOnlyList<SalesCustomerSummaryRowDto>> CustomerSummaryAsync(DateOnly from, DateOnly to, int? customerId, CancellationToken ct = default);
+    Task<IReadOnlyList<SalesWarehouseSummaryRowDto>> WarehouseSummaryAsync(DateOnly from, DateOnly to, int? warehouseId, CancellationToken ct = default);
+    Task<IReadOnlyList<SalesDiscountSummaryRowDto>> DiscountSummaryAsync(DateOnly from, DateOnly to, CancellationToken ct = default);
+    Task<IReadOnlyList<SalesFreeIssueSummaryRowDto>> FreeIssueSummaryAsync(DateOnly from, DateOnly to, CancellationToken ct = default);
+}

Backend/ERPCore/Services/Interfaces/ISalesSlipService.cs

@@ -0,0 +1,19 @@
+using ERPCore.Common.Http;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Sales;
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Services.Interfaces;
+
+public interface ISalesSlipService
+{
+    Task<PagedResponse<SalesSlipSummaryDto>> ListAsync(PageQuery query, SalesSlipStatus? status, int? customerId, int? warehouseId, CancellationToken ct = default);
+    Task<ETagged<SalesSlipDto>?> GetAsync(int salesSlipId, CancellationToken ct = default);
+    Task<PagedResponse<FreeIssueSummaryDto>> ListFreeIssuesAsync(PageQuery query, SalesSlipStatus? status, int? customerId, int? warehouseId, CancellationToken ct = default);
+    Task<ETagged<FreeIssueDto>?> GetFreeIssueAsync(int salesSlipId, CancellationToken ct = default);
+    Task<SalesSlipPostingCheckDto> CheckPostingAsync(int salesSlipId, CancellationToken ct = default);
+    Task<ETagged<SalesSlipDto>> CreateAsync(CreateSalesSlipRequest request, CancellationToken ct = default);
+    Task<ETagged<SalesSlipDto>> UpdateAsync(int salesSlipId, UpdateSalesSlipRequest request, uint expectedRowVersion, CancellationToken ct = default);
+    Task<SalesSlipDto> PostAsync(int salesSlipId, CancellationToken ct = default);
+    Task<SalesSlipDto> CancelAsync(int salesSlipId, CancellationToken ct = default);
+}

Backend/ERPCore/Services/SalesDocumentWorkflowService.cs

@@ -0,0 +1,44 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using ERPCore.Repositories.Interfaces;
+using ERPCore.Services.Interfaces;
+using ERPCore.System.Errors;
+using Microsoft.EntityFrameworkCore;
+
+namespace ERPCore.Services;
+
+public sealed class SalesDocumentWorkflowService : ISalesDocumentWorkflowService
+{
+    private readonly IRepository<SalesInvoice> _invoices;
+    private readonly IRepository<SalesSlip> _slips;
+
+    public SalesDocumentWorkflowService(IRepository<SalesInvoice> invoices, IRepository<SalesSlip> slips)
+    {
+        _invoices = invoices;
+        _slips = slips;
+    }
+
+    public async Task<SalesInvoice> LoadEditableInvoiceAsync(int salesInvoiceId, uint expectedRowVersion, CancellationToken ct = default)
+    {
+        var invoice = await _invoices.Query().Include(x => x.Lines)
+            .FirstOrDefaultAsync(x => x.SalesInvoiceId == salesInvoiceId, ct)
+            ?? throw new NotFoundException($"Sales invoice {salesInvoiceId} was not found.");
+        if (invoice.RowVersion != expectedRowVersion)
+            throw new DomainException(ErrorCodes.ConcurrencyConflict, "The sales invoice was modified by another request.", 412);
+        if (invoice.Status != SalesInvoiceStatus.Draft)
+            throw new ConflictException($"Sales invoice {salesInvoiceId} is {invoice.Status} and cannot be edited.");
+        return invoice;
+    }
+
+    public async Task<SalesSlip> LoadEditableSlipAsync(int salesSlipId, uint expectedRowVersion, CancellationToken ct = default)
+    {
+        var slip = await _slips.Query().Include(x => x.Lines)
+            .FirstOrDefaultAsync(x => x.SalesSlipId == salesSlipId, ct)
+            ?? throw new NotFoundException($"Sales slip {salesSlipId} was not found.");
+        if (slip.RowVersion != expectedRowVersion)
+            throw new DomainException(ErrorCodes.ConcurrencyConflict, "The sales slip was modified by another request.", 412);
+        if (slip.Status != SalesSlipStatus.Draft)
+            throw new ConflictException($"Sales slip {salesSlipId} is {slip.Status} and cannot be edited.");
+        return slip;
+    }
+}

Backend/ERPCore/Services/SalesDomainService.cs

@@ -0,0 +1,110 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using ERPCore.Repositories.Interfaces;
+using ERPCore.Services.Interfaces;
+using ERPCore.System.Errors;
+using Microsoft.EntityFrameworkCore;
+
+namespace ERPCore.Services;
+
+public sealed class SalesDomainService : ISalesDomainService
+{
+    private readonly IRepository<Customer> _customers;
+    private readonly IRepository<Warehouse> _warehouses;
+    private readonly IRepository<User> _users;
+    private readonly IRepository<Item> _items;
+    private readonly IRepository<Uom> _uoms;
+    private readonly ISalesPricingService _pricing;
+
+    public SalesDomainService(
+        IRepository<Customer> customers,
+        IRepository<Warehouse> warehouses,
+        IRepository<User> users,
+        IRepository<Item> items,
+        IRepository<Uom> uoms,
+        ISalesPricingService pricing)
+    {
+        _customers = customers;
+        _warehouses = warehouses;
+        _users = users;
+        _items = items;
+        _uoms = uoms;
+        _pricing = pricing;
+    }
+
+    public async Task ValidateSalesHeaderAsync(int customerId, int warehouseId, int? cashierUserId, bool requireCashierUser, CancellationToken ct = default)
+    {
+        if (!await _customers.Query().AnyAsync(x => x.CustomerId == customerId, ct))
+            throw new NotFoundException($"Customer {customerId} was not found.");
+        if (!await _warehouses.Query().AnyAsync(x => x.WarehouseId == warehouseId, ct))
+            throw new NotFoundException($"Warehouse {warehouseId} was not found.");
+        if (requireCashierUser)
+        {
+            if (cashierUserId is null)
+                throw new DomainException(ErrorCodes.Validation, "Cashier user is required.", 422);
+            if (!await _users.Query().AnyAsync(x => x.UserId == cashierUserId, ct))
+                throw new NotFoundException($"User {cashierUserId} was not found.");
+        }
+    }
+
+    public async Task ValidateSalesLineAsync(
+        int headerWarehouseId, int lineItemId, int lineUomId, int lineWarehouseId, decimal qty, decimal freeQty, int? parentLineId, CancellationToken ct = default)
+    {
+        if (qty <= 0)
+            throw new DomainException(ErrorCodes.Validation, "Sales line quantity must be greater than zero.", 422);
+        if (freeQty < 0)
+            throw new DomainException(ErrorCodes.Validation, "Sales free quantity cannot be negative.", 422);
+        if (parentLineId is not null && parentLineId <= 0)
+            throw new DomainException(ErrorCodes.Validation, "Parent line id must be positive when supplied.", 422);
+        if (lineWarehouseId != headerWarehouseId)
+            throw new DomainException(ErrorCodes.Validation, $"Sales line warehouse {lineWarehouseId} must match header warehouse {headerWarehouseId}.", 422);
+        if (!await _items.Query().AnyAsync(x => x.ItemId == lineItemId, ct))
+            throw new NotFoundException($"Item {lineItemId} was not found.");
+        if (!await _uoms.Query().AnyAsync(x => x.UomId == lineUomId, ct))
+            throw new NotFoundException($"UOM {lineUomId} was not found.");
+        if (!await _warehouses.Query().AnyAsync(x => x.WarehouseId == lineWarehouseId, ct))
+            throw new NotFoundException($"Warehouse {lineWarehouseId} was not found.");
+    }
+
+    public Task<SalesPriceResolution> ResolveLinePriceAsync(int itemId, int warehouseId, decimal? requestedUnitPrice, bool allowManualOverride, CancellationToken ct = default)
+        => _pricing.ResolveAsync(itemId, warehouseId, requestedUnitPrice, allowManualOverride, ct);
+
+    public SalesLineComputation ComputeLine(
+        decimal qty,
+        decimal freeQty,
+        decimal unitPrice,
+        SalesDiscountMode discountMode,
+        decimal discountPct,
+        decimal discountValue,
+        decimal discountAmount,
+        decimal taxPct,
+        bool isFreeIssue)
+    {
+        var gross = qty * unitPrice;
+        var discountTotal = isFreeIssue
+            ? 0m
+            : CalculateDiscount(gross, discountMode, discountPct, discountValue, discountAmount);
+        var netUnit = qty > 0 ? (gross - discountTotal) / qty : 0m;
+        var lineTotal = gross - discountTotal;
+        var taxAmount = lineTotal * (taxPct / 100m);
+        return new SalesLineComputation(gross, discountTotal, netUnit, lineTotal, taxAmount);
+    }
+
+    public async Task<bool> IsStockedItemAsync(int itemId, CancellationToken ct = default)
+        => await _items.Query().AsNoTracking()
+            .Where(x => x.ItemId == itemId)
+            .Select(x => x.StockNature == StockNature.Stocked)
+            .FirstAsync(ct);
+
+    private static decimal CalculateDiscount(decimal gross, SalesDiscountMode mode, decimal discountPct, decimal discountValue, decimal legacyDiscountAmount)
+    {
+        var computed = mode == SalesDiscountMode.Amount
+            ? discountValue
+            : gross * (discountPct / 100m);
+
+        if (computed <= 0m && legacyDiscountAmount > 0m)
+            computed = legacyDiscountAmount;
+
+        return Math.Min(gross, Math.Max(0m, computed));
+    }
+}

Backend/ERPCore/Services/SalesInvoiceService.cs

@@ -0,0 +1,195 @@
+using ERPCore.Common.Http;
+using ERPCore.Domain;
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Sales;
+using ERPCore.Infra.Auth;
+using ERPCore.Infra.UoW;
+using ERPCore.Repositories.Interfaces;
+using ERPCore.Services.Interfaces;
+using ERPCore.Services.Stock;
+using ERPCore.System.Errors;
+using Microsoft.EntityFrameworkCore;
+
+namespace ERPCore.Services;
+
+public sealed class SalesInvoiceService : ISalesInvoiceService
+{
+    private readonly IRepository<SalesInvoice> _invoices;
+    private readonly IRepository<Customer> _customers;
+    private readonly IRepository<Item> _items;
+    private readonly IRepository<Uom> _uoms;
+    private readonly IRepository<Warehouse> _warehouses;
+    private readonly ISalesDomainService _sales;
+    private readonly ISalesPostingService _posting;
+    private readonly ISalesMappingService _mapping;
+    private readonly ISalesDocumentWorkflowService _workflow;
+    private readonly ICurrentUser _currentUser;
+    private readonly INumberSequenceService _numbers;
+    private readonly IUnitOfWork _uow;
+
+    public SalesInvoiceService(
+        IRepository<SalesInvoice> invoices, IRepository<Customer> customers, IRepository<Item> items,
+        IRepository<Uom> uoms, IRepository<Warehouse> warehouses, ISalesDomainService sales, ISalesPostingService posting, ISalesMappingService mapping,
+        ISalesDocumentWorkflowService workflow,
+        ICurrentUser currentUser, INumberSequenceService numbers, IUnitOfWork uow)
+    {
+        _invoices = invoices;
+        _customers = customers;
+        _items = items;
+        _uoms = uoms;
+        _warehouses = warehouses;
+        _sales = sales;
+        _posting = posting;
+        _mapping = mapping;
+        _workflow = workflow;
+        _currentUser = currentUser;
+        _numbers = numbers;
+        _uow = uow;
+    }
+
+    public async Task<PagedResponse<SalesInvoiceSummaryDto>> ListAsync(PageQuery query, SalesInvoiceStatus? status, int? customerId, int? warehouseId, CancellationToken ct = default)
+    {
+        IQueryable<SalesInvoice> q = _invoices.Query().AsNoTracking().Include(x => x.Lines);
+        if (!string.IsNullOrWhiteSpace(query.Q))
+        {
+            var term = query.Q.Trim();
+            q = q.Where(x => EF.Functions.ILike(x.InvoiceNo, $"%{term}%") || EF.Functions.ILike(x.CustomerSnapshotName, $"%{term}%"));
+        }
+        if (status is not null) q = q.Where(x => x.Status == status);
+        if (customerId is not null) q = q.Where(x => x.CustomerId == customerId);
+        if (warehouseId is not null) q = q.Where(x => x.WarehouseId == warehouseId);
+
+        var total = await q.CountAsync(ct);
+        var rows = await q.OrderByDescending(x => x.SalesInvoiceId).Skip(query.Skip).Take(query.PageSize).ToListAsync(ct);
+
+        return PagedResponse<SalesInvoiceSummaryDto>.Create(rows.Select(MapSummary).ToList(), query.Page, query.PageSize, total);
+    }
+
+    public async Task<ETagged<SalesInvoiceDto>?> GetAsync(int salesInvoiceId, CancellationToken ct = default)
+    {
+        var invoice = await _invoices.Query().AsNoTracking().Include(x => x.Lines)
+            .FirstOrDefaultAsync(x => x.SalesInvoiceId == salesInvoiceId, ct);
+        return invoice is null ? null : new ETagged<SalesInvoiceDto>(_mapping.MapInvoice(invoice), invoice.RowVersion);
+    }
+
+    public Task<SalesInvoicePostingCheckDto> CheckPostingAsync(int salesInvoiceId, CancellationToken ct = default)
+        => _posting.CheckInvoiceAsync(salesInvoiceId, ct);
+
+    public async Task<ETagged<SalesInvoiceDto>> CreateAsync(CreateSalesInvoiceRequest request, CancellationToken ct = default)
+    {
+        await _sales.ValidateSalesHeaderAsync(request.CustomerId, request.WarehouseId, null, false, ct);
+        var invoice = new SalesInvoice
+        {
+            InvoiceNo = await _numbers.NextAsync(DocumentTypes.SalesInvoice, ct),
+            InvoiceDate = DateTime.UtcNow,
+            CustomerId = request.CustomerId,
+            WarehouseId = request.WarehouseId,
+            InvoiceType = request.InvoiceType,
+            Status = SalesInvoiceStatus.Draft,
+            CreatedBy = _currentUser.AuditUserId,
+            CreatedAt = DateTime.UtcNow
+        };
+        invoice.CustomerSnapshotName = await _customers.Query().Where(x => x.CustomerId == request.CustomerId).Select(x => x.DisplayName ?? x.Name).FirstAsync(ct);
+        invoice.CustomerSnapshotTaxNo = await _customers.Query().Where(x => x.CustomerId == request.CustomerId).Select(x => x.TaxRegistrationNo).FirstAsync(ct);
+        invoice.Lines = await BuildLinesAsync(request.WarehouseId, request.Lines, ct);
+        Recalculate(invoice);
+
+        await _invoices.AddAsync(invoice, ct);
+        await _uow.SaveChangesAsync(ct);
+        return new ETagged<SalesInvoiceDto>(_mapping.MapInvoice(invoice), invoice.RowVersion);
+    }
+
+    public async Task<ETagged<SalesInvoiceDto>> UpdateAsync(int salesInvoiceId, UpdateSalesInvoiceRequest request, uint expectedRowVersion, CancellationToken ct = default)
+    {
+        var invoice = await _workflow.LoadEditableInvoiceAsync(salesInvoiceId, expectedRowVersion, ct);
+
+        await _sales.ValidateSalesHeaderAsync(request.CustomerId, request.WarehouseId, null, false, ct);
+        invoice.CustomerId = request.CustomerId;
+        invoice.WarehouseId = request.WarehouseId;
+        invoice.InvoiceType = request.InvoiceType;
+        invoice.CustomerSnapshotName = await _customers.Query().Where(x => x.CustomerId == request.CustomerId).Select(x => x.DisplayName ?? x.Name).FirstAsync(ct);
+        invoice.CustomerSnapshotTaxNo = await _customers.Query().Where(x => x.CustomerId == request.CustomerId).Select(x => x.TaxRegistrationNo).FirstAsync(ct);
+        invoice.Lines.Clear();
+        foreach (var line in await BuildLinesAsync(request.WarehouseId, request.Lines, ct)) invoice.Lines.Add(line);
+        Recalculate(invoice);
+        invoice.UpdatedAt = DateTime.UtcNow;
+        await _uow.SaveChangesAsync(ct);
+        return new ETagged<SalesInvoiceDto>(_mapping.MapInvoice(invoice), invoice.RowVersion);
+    }
+
+    public async Task<SalesInvoiceDto> PostAsync(int salesInvoiceId, CancellationToken ct = default)
+        {
+            await _posting.PostInvoiceAsync(salesInvoiceId, ct);
+            var invoice = await _invoices.Query().AsNoTracking().Include(x => x.Lines)
+                .FirstAsync(x => x.SalesInvoiceId == salesInvoiceId, ct);
+            return _mapping.MapInvoice(invoice);
+        }
+
+    public async Task<SalesInvoiceDto> CancelAsync(int salesInvoiceId, CancellationToken ct = default)
+    {
+        var invoice = await _invoices.Query().Include(x => x.Lines).FirstOrDefaultAsync(x => x.SalesInvoiceId == salesInvoiceId, ct)
+            ?? throw new NotFoundException($"Sales invoice {salesInvoiceId} was not found.");
+        if (invoice.Status != SalesInvoiceStatus.Draft)
+            throw new ConflictException($"Sales invoice {salesInvoiceId} is {invoice.Status} and cannot be cancelled.");
+        invoice.Status = SalesInvoiceStatus.Cancelled;
+        invoice.UpdatedAt = DateTime.UtcNow;
+        await _uow.SaveChangesAsync(ct);
+        return _mapping.MapInvoice(invoice);
+    }
+
+    private async Task<List<SalesInvoiceLine>> BuildLinesAsync(int headerWarehouseId, List<CreateSalesInvoiceLineRequest> requests, CancellationToken ct)
+    {
+        var lines = new List<SalesInvoiceLine>();
+        foreach (var r in requests)
+        {
+            var item = await _items.Query().AsNoTracking().FirstAsync(x => x.ItemId == r.ItemId, ct);
+            await _sales.ValidateSalesLineAsync(headerWarehouseId, r.ItemId, r.UomId, r.WarehouseId, r.Qty, r.FreeQty, r.ParentLineId, ct);
+            var resolved = await _sales.ResolveLinePriceAsync(r.ItemId, r.WarehouseId, r.UnitPrice, r.AllowManualPriceOverride, ct);
+            var unitPrice = resolved.UnitPrice;
+            var priceSource = resolved.PriceSource;
+
+            var calc = _sales.ComputeLine(r.Qty, r.FreeQty, unitPrice, r.DiscountMode, r.DiscountPct, r.DiscountValue, r.DiscountAmount, r.TaxPct, r.IsFreeIssue);
+
+            lines.Add(new SalesInvoiceLine
+            {
+                ItemId = r.ItemId,
+                Description = item.Name,
+                Qty = r.Qty,
+                FreeQty = r.FreeQty,
+                UomId = r.UomId,
+                WarehouseId = r.WarehouseId,
+                UnitPrice = unitPrice,
+                BaseCost = unitPrice,
+                PriceSource = priceSource,
+                DiscountPct = r.DiscountPct,
+                DiscountAmount = calc.DiscountTotal,
+                DiscountMode = r.DiscountMode,
+                NetUnitPrice = calc.NetUnitPrice,
+                LineTotal = calc.LineTotal,
+                TaxPct = r.TaxPct,
+                TaxAmount = calc.TaxAmount,
+                IsFreeIssue = r.IsFreeIssue,
+                ParentLineId = r.ParentLineId
+            });
+        }
+        return lines;
+    }
+
+    private static void Recalculate(SalesInvoice invoice)
+    {
+        invoice.Subtotal = invoice.Lines.Sum(x => x.Qty * x.UnitPrice);
+        invoice.DiscountTotal = invoice.Lines.Sum(x => x.DiscountAmount);
+        invoice.TaxTotal = invoice.Lines.Sum(x => x.TaxAmount);
+        invoice.GrandTotal = invoice.Lines.Sum(x => x.LineTotal) + invoice.TaxTotal;
+        invoice.RoundOff = 0m;
+        invoice.NetPayable = invoice.GrandTotal + invoice.RoundOff;
+        invoice.PaidAmount = 0m;
+        invoice.BalanceAmount = invoice.NetPayable;
+    }
+
+    private SalesInvoiceSummaryDto MapSummary(SalesInvoice x) => new(
+        x.SalesInvoiceId, x.InvoiceNo, x.InvoiceDate, x.CustomerId, x.CustomerSnapshotName,
+        x.WarehouseId, x.InvoiceType, x.Status, _mapping.MapInvoiceTotals(x), x.CreatedAt);
+}

Backend/ERPCore/Services/SalesMappingService.cs

@@ -0,0 +1,51 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Dtos.Sales;
+using ERPCore.Services.Interfaces;
+
+namespace ERPCore.Services;
+
+public sealed class SalesMappingService : ISalesMappingService
+{
+    public SalesInvoiceTotalsDto MapInvoiceTotals(SalesInvoice invoice)
+        => new(
+            invoice.Subtotal,
+            invoice.DiscountTotal,
+            invoice.Lines.Sum(l => l.FreeQty),
+            invoice.TaxTotal,
+            invoice.GrandTotal,
+            invoice.RoundOff,
+            invoice.NetPayable,
+            invoice.PaidAmount,
+            invoice.BalanceAmount);
+
+    public SalesSlipTotalsDto MapSlipTotals(SalesSlip slip)
+        => new(
+            slip.Subtotal,
+            slip.DiscountTotal,
+            slip.Lines.Sum(l => l.FreeQty),
+            slip.TaxTotal,
+            slip.GrandTotal,
+            slip.PaidAmount,
+            slip.BalanceAmount);
+
+    public SalesInvoiceDto MapInvoice(SalesInvoice invoice)
+        => new(
+            invoice.SalesInvoiceId, invoice.InvoiceNo, invoice.InvoiceDate, invoice.CustomerId,
+            invoice.CustomerSnapshotName, invoice.CustomerSnapshotTaxNo, invoice.WarehouseId,
+            invoice.InvoiceType, invoice.Status, invoice.CreatedBy, invoice.CreatedAt, invoice.UpdatedAt,
+            MapInvoiceTotals(invoice),
+            invoice.Lines.Select(l => new SalesInvoiceLineDto(
+                l.SalesInvoiceLineId, l.ItemId, l.Description, l.Qty, l.FreeQty, l.UomId, l.WarehouseId,
+                l.UnitPrice, l.BaseCost, l.PriceSource, l.DiscountPct, l.DiscountAmount, l.DiscountMode,
+                l.NetUnitPrice, l.LineTotal, l.TaxPct, l.TaxAmount, l.IsFreeIssue, l.ParentLineId)).ToList());
+
+    public SalesSlipDto MapSlip(SalesSlip slip)
+        => new(
+            slip.SalesSlipId, slip.SlipNo, slip.SlipDate, slip.CustomerId, slip.CustomerSnapshotName,
+            slip.WarehouseId, slip.CashierUserId, slip.Status, slip.CreatedAt, slip.UpdatedAt,
+            MapSlipTotals(slip),
+            slip.Lines.Select(l => new SalesSlipLineDto(
+                l.SalesSlipLineId, l.ItemId, l.Description, l.Qty, l.FreeQty, l.UomId, l.WarehouseId,
+                l.UnitPrice, l.BaseCost, l.PriceSource, l.DiscountPct, l.DiscountAmount, l.DiscountMode,
+                l.NetUnitPrice, l.LineTotal, l.TaxPct, l.TaxAmount, l.IsFreeIssue, l.ParentLineId)).ToList());
+}

Backend/ERPCore/Services/SalesPostingService.cs

@@ -0,0 +1,214 @@
+using ERPCore.Domain;
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Sales;
+using ERPCore.Infra.Auth;
+using ERPCore.Infra.UoW;
+using ERPCore.Repositories.Interfaces;
+using ERPCore.Services.Interfaces;
+using ERPCore.Services.Stock;
+using ERPCore.System.Errors;
+using Microsoft.EntityFrameworkCore;
+
+namespace ERPCore.Services;
+
+public sealed class SalesPostingService : ISalesPostingService
+{
+    private readonly IRepository<SalesInvoice> _invoices;
+    private readonly IRepository<SalesSlip> _slips;
+    private readonly IRepository<BundleSale> _bundles;
+    private readonly IRepository<Item> _items;
+    private readonly IFifoCostingService _fifo;
+    private readonly ISalesDomainService _sales;
+    private readonly ICurrentUser _currentUser;
+    private readonly IUnitOfWork _uow;
+
+    public SalesPostingService(
+        IRepository<SalesInvoice> invoices,
+        IRepository<SalesSlip> slips,
+        IRepository<BundleSale> bundles,
+        IRepository<Item> items,
+        IFifoCostingService fifo,
+        ISalesDomainService sales,
+        ICurrentUser currentUser,
+        IUnitOfWork uow)
+    {
+        _invoices = invoices;
+        _slips = slips;
+        _bundles = bundles;
+        _items = items;
+        _fifo = fifo;
+        _sales = sales;
+        _currentUser = currentUser;
+        _uow = uow;
+    }
+
+    public async Task<SalesInvoicePostingCheckDto> CheckInvoiceAsync(int salesInvoiceId, CancellationToken ct = default)
+    {
+        var invoice = await _invoices.Query().AsNoTracking().Include(x => x.Lines)
+            .FirstOrDefaultAsync(x => x.SalesInvoiceId == salesInvoiceId, ct)
+            ?? throw new NotFoundException($"Sales invoice {salesInvoiceId} was not found.");
+
+        if (invoice.Status != SalesInvoiceStatus.Draft)
+            return new SalesInvoicePostingCheckDto(invoice.SalesInvoiceId, invoice.InvoiceNo, invoice.Status, false, Array.Empty<SalesInvoicePostingIssueDto>());
+
+        var issues = new List<SalesInvoicePostingIssueDto>();
+        foreach (var line in invoice.Lines)
+        {
+            if (!await _sales.IsStockedItemAsync(line.ItemId, ct))
+                continue;
+            var requestedQty = line.Qty + line.FreeQty;
+            var available = await _fifo.GetOnHandAsync(line.ItemId, line.WarehouseId, ct);
+            if (available >= requestedQty) continue;
+
+            var item = await _items.Query().AsNoTracking()
+                .Where(x => x.ItemId == line.ItemId)
+                .Select(x => new { x.Sku, x.Name })
+                .FirstAsync(ct);
+
+            issues.Add(new SalesInvoicePostingIssueDto(
+                line.SalesInvoiceLineId, line.ItemId, item.Sku, item.Name, line.WarehouseId,
+                requestedQty, available, requestedQty - available, line.IsFreeIssue));
+        }
+
+        return new SalesInvoicePostingCheckDto(invoice.SalesInvoiceId, invoice.InvoiceNo, invoice.Status, issues.Count == 0, issues);
+    }
+
+    public async Task<SalesSlipPostingCheckDto> CheckSlipAsync(int salesSlipId, CancellationToken ct = default)
+    {
+        var slip = await _slips.Query().AsNoTracking().Include(x => x.Lines)
+            .FirstOrDefaultAsync(x => x.SalesSlipId == salesSlipId, ct)
+            ?? throw new NotFoundException($"Sales slip {salesSlipId} was not found.");
+
+        if (slip.Status != SalesSlipStatus.Draft)
+            return new SalesSlipPostingCheckDto(slip.SalesSlipId, slip.SlipNo, slip.Status, false, Array.Empty<SalesSlipPostingIssueDto>());
+
+        var issues = new List<SalesSlipPostingIssueDto>();
+        foreach (var line in slip.Lines)
+        {
+            if (!await _sales.IsStockedItemAsync(line.ItemId, ct))
+                continue;
+            var requestedQty = line.Qty + line.FreeQty;
+            var available = await _fifo.GetOnHandAsync(line.ItemId, line.WarehouseId, ct);
+            if (available >= requestedQty) continue;
+
+            var item = await _items.Query().AsNoTracking()
+                .Where(x => x.ItemId == line.ItemId)
+                .Select(x => new { x.Sku, x.Name })
+                .FirstAsync(ct);
+
+            issues.Add(new SalesSlipPostingIssueDto(
+                line.SalesSlipLineId, line.ItemId, item.Sku, item.Name, line.WarehouseId,
+                requestedQty, available, requestedQty - available, line.IsFreeIssue));
+        }
+
+        return new SalesSlipPostingCheckDto(slip.SalesSlipId, slip.SlipNo, slip.Status, issues.Count == 0, issues);
+    }
+
+    public async Task<BundleSalePostingCheckDto> CheckBundleAsync(int bundleSaleId, CancellationToken ct = default)
+    {
+        var bundle = await _bundles.Query().AsNoTracking().Include(x => x.Lines)
+            .FirstOrDefaultAsync(x => x.BundleSaleId == bundleSaleId, ct)
+            ?? throw new NotFoundException($"Bundle sale {bundleSaleId} was not found.");
+
+        if (bundle.Status != BundleSaleStatus.Draft)
+            return new BundleSalePostingCheckDto(bundle.BundleSaleId, bundle.BundleNo, bundle.Status, false, Array.Empty<BundleSalePostingIssueDto>());
+
+        var issues = new List<BundleSalePostingIssueDto>();
+        foreach (var line in bundle.Lines.Where(l => l.IncludeInBundle))
+        {
+            if (!await _sales.IsStockedItemAsync(line.ItemId, ct))
+                continue;
+            var available = await _fifo.GetOnHandAsync(line.ItemId, line.WarehouseId, ct);
+            if (available >= line.Qty) continue;
+
+            var item = await _items.Query().AsNoTracking()
+                .Where(x => x.ItemId == line.ItemId)
+                .Select(x => new { x.Sku, x.Name })
+                .FirstAsync(ct);
+
+            issues.Add(new BundleSalePostingIssueDto(line.BundleSaleLineId, line.ItemId, item.Sku, item.Name, line.WarehouseId, line.Qty, available, line.Qty - available));
+        }
+
+        return new BundleSalePostingCheckDto(bundle.BundleSaleId, bundle.BundleNo, bundle.Status, issues.Count == 0, issues);
+    }
+
+    public Task PostInvoiceAsync(int salesInvoiceId, CancellationToken ct = default)
+        => PostAsync(
+            load: () => _invoices.Query().Include(x => x.Lines).FirstOrDefaultAsync(x => x.SalesInvoiceId == salesInvoiceId, ct),
+            notFoundMessage: $"Sales invoice {salesInvoiceId} was not found.",
+            statusSelector: x => x.Status,
+            ensureDraftMessage: x => $"Sales invoice {x.SalesInvoiceId} is {x.Status} and cannot be posted.",
+            getLines: x => x.Lines.Select(l => new PostingLine(l.ItemId, l.WarehouseId, l.Qty + l.FreeQty, l.Qty, l.FreeQty)),
+            setPosted: x => x.Status = SalesInvoiceStatus.Posted,
+            setUpdated: x => x.UpdatedAt = DateTime.UtcNow,
+            sourceDocType: nameof(SalesInvoice),
+            getDocId: x => x.SalesInvoiceId,
+            ct: ct);
+
+    public Task PostSlipAsync(int salesSlipId, CancellationToken ct = default)
+        => PostAsync(
+            load: () => _slips.Query().Include(x => x.Lines).FirstOrDefaultAsync(x => x.SalesSlipId == salesSlipId, ct),
+            notFoundMessage: $"Sales slip {salesSlipId} was not found.",
+            statusSelector: x => x.Status,
+            ensureDraftMessage: x => $"Sales slip {x.SalesSlipId} is {x.Status} and cannot be posted.",
+            getLines: x => x.Lines.Select(l => new PostingLine(l.ItemId, l.WarehouseId, l.Qty + l.FreeQty, l.Qty, l.FreeQty)),
+            setPosted: x => x.Status = SalesSlipStatus.Posted,
+            setUpdated: x => x.UpdatedAt = DateTime.UtcNow,
+            sourceDocType: nameof(SalesSlip),
+            getDocId: x => x.SalesSlipId,
+            ct: ct);
+
+    public Task PostBundleAsync(int bundleSaleId, CancellationToken ct = default)
+        => PostAsync(
+            load: () => _bundles.Query().Include(x => x.Lines).FirstOrDefaultAsync(x => x.BundleSaleId == bundleSaleId, ct),
+            notFoundMessage: $"Bundle sale {bundleSaleId} was not found.",
+            statusSelector: x => x.Status,
+            ensureDraftMessage: x => $"Bundle sale {x.BundleSaleId} is {x.Status} and cannot be posted.",
+            getLines: x => x.Lines.Where(l => l.IncludeInBundle).Select(l => new PostingLine(l.ItemId, l.WarehouseId, l.Qty, l.Qty, 0m)),
+            setPosted: x => x.Status = BundleSaleStatus.Posted,
+            setUpdated: x => x.UpdatedAt = DateTime.UtcNow,
+            sourceDocType: nameof(BundleSale),
+            getDocId: x => x.BundleSaleId,
+            ct: ct);
+
+    private async Task PostAsync<T>(
+        Func<Task<T?>> load,
+        string notFoundMessage,
+        Func<T, object> statusSelector,
+        Func<T, string> ensureDraftMessage,
+        Func<T, IEnumerable<PostingLine>> getLines,
+        Action<T> setPosted,
+        Action<T> setUpdated,
+        string sourceDocType,
+        Func<T, int> getDocId,
+        CancellationToken ct)
+        where T : class
+    {
+        var doc = await load() ?? throw new NotFoundException(notFoundMessage);
+        var status = statusSelector(doc);
+        var statusValue = status?.ToString() ?? string.Empty;
+        if (!string.Equals(statusValue, "Draft", StringComparison.Ordinal))
+            throw new ConflictException(ensureDraftMessage(doc));
+
+        await _uow.ExecuteInTransactionAsync(async token =>
+        {
+            foreach (var line in getLines(doc))
+            {
+                if (line.Qty <= 0) continue;
+                if (!await _sales.IsStockedItemAsync(line.ItemId, token))
+                    continue;
+
+                var consumed = await _fifo.ConsumeAsync(line.ItemId, line.WarehouseId, null, line.Qty, token);
+                var cost = consumed.Count == 0 ? 0m : consumed.Sum(x => x.Qty * x.UnitCost) / consumed.Sum(x => x.Qty);
+                await _fifo.PostLedgerAsync(line.ItemId, line.WarehouseId, null, null, null, _currentUser.AuditUserId,
+                    Direction.Out, line.Qty, cost, 0m, sourceDocType, getDocId(doc), DateTime.UtcNow, token);
+            }
+
+            setPosted(doc);
+            setUpdated(doc);
+        }, ct);
+    }
+
+    private sealed record PostingLine(int ItemId, int WarehouseId, decimal Qty, decimal PaidQty, decimal FreeQty);
+}

Backend/ERPCore/Services/SalesPricingService.cs

@@ -0,0 +1,79 @@
+using ERPCore.Domain;
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using ERPCore.Repositories.Interfaces;
+using ERPCore.Services.Interfaces;
+using ERPCore.Services.Stock;
+using Microsoft.EntityFrameworkCore;
+
+namespace ERPCore.Services;
+
+public sealed class SalesPricingService : ISalesPricingService
+{
+    private readonly IRepository<Item> _items;
+    private readonly IRepository<GrnLine> _grnLines;
+    private readonly IFifoCostingService _fifo;
+
+    public SalesPricingService(IRepository<Item> items, IRepository<GrnLine> grnLines, IFifoCostingService fifo)
+    {
+        _items = items;
+        _grnLines = grnLines;
+        _fifo = fifo;
+    }
+
+    public async Task<SalesPriceResolution> ResolveAsync(
+        int itemId, int warehouseId, decimal? requestedUnitPrice, bool allowManualOverride, CancellationToken ct = default)
+    {
+        var item = await _items.Query().AsNoTracking().FirstOrDefaultAsync(x => x.ItemId == itemId, ct)
+            ?? throw new InvalidOperationException($"Item {itemId} was not found.");
+
+        if (requestedUnitPrice is not null)
+        {
+            if (!allowManualOverride)
+            {
+                if (item.SalePrice.HasValue)
+                    return new SalesPriceResolution(item.SalePrice.Value, "SALE_PRICE", item.SalePrice.Value);
+
+                var grnPrice = await GetWeightedGrnPriceAsync(itemId, warehouseId, ct);
+                if (grnPrice is not null)
+                    return new SalesPriceResolution(grnPrice.Value, "GRN_WEIGHTED_AVG", grnPrice.Value);
+
+                return new SalesPriceResolution(await GetFifoFallbackPriceAsync(itemId, warehouseId, ct), "FIFO_AVG", 0m);
+            }
+
+            return new SalesPriceResolution(requestedUnitPrice.Value, "MANUAL", requestedUnitPrice.Value);
+        }
+
+        if (item.SalePrice.HasValue)
+            return new SalesPriceResolution(item.SalePrice.Value, "SALE_PRICE", item.SalePrice.Value);
+
+        var weighted = await GetWeightedGrnPriceAsync(itemId, warehouseId, ct);
+        if (weighted is not null)
+            return new SalesPriceResolution(weighted.Value, "GRN_WEIGHTED_AVG", weighted.Value);
+
+        return new SalesPriceResolution(await GetFifoFallbackPriceAsync(itemId, warehouseId, ct), "FIFO_AVG", 0m);
+    }
+
+    private async Task<decimal?> GetWeightedGrnPriceAsync(int itemId, int warehouseId, CancellationToken ct)
+    {
+        var rows = await _grnLines.Query().AsNoTracking()
+            .Where(l => l.ItemId == itemId
+                        && l.Grn != null
+                        && l.Grn.WarehouseId == warehouseId
+                        && l.Grn.Status == GrnStatus.Confirmed)
+            .Select(l => new { l.Qty, l.ReceivedValue })
+            .ToListAsync(ct);
+
+        var totalQty = rows.Sum(x => x.Qty);
+        if (totalQty <= 0) return null;
+
+        var totalValue = rows.Sum(x => x.ReceivedValue);
+        return totalValue / totalQty;
+    }
+
+    private async Task<decimal> GetFifoFallbackPriceAsync(int itemId, int warehouseId, CancellationToken ct)
+    {
+        var valuation = await _fifo.GetValuationAsync(itemId, warehouseId, ct);
+        return valuation.TotalQty > 0 ? valuation.TotalValue / valuation.TotalQty : 0m;
+    }
+}

Backend/ERPCore/Services/SalesPromotionSuggestionService.cs

@@ -0,0 +1,74 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Sales;
+using ERPCore.Repositories.Interfaces;
+using ERPCore.Services.Interfaces;
+using Microsoft.EntityFrameworkCore;
+
+namespace ERPCore.Services;
+
+public sealed class SalesPromotionSuggestionService : ISalesPromotionSuggestionService
+{
+    private const decimal FreeIssueThreshold = 10m;
+
+    private readonly IRepository<SalesSlip> _slips;
+    private readonly IRepository<Item> _items;
+
+    public SalesPromotionSuggestionService(IRepository<SalesSlip> slips, IRepository<Item> items)
+    {
+        _slips = slips;
+        _items = items;
+    }
+
+    public async Task<SalesFreeIssueSuggestionDto?> GetFreeIssueSuggestionsAsync(int salesSlipId, CancellationToken ct = default)
+    {
+        var slip = await _slips.Query().AsNoTracking().Include(x => x.Lines)
+            .FirstOrDefaultAsync(x => x.SalesSlipId == salesSlipId, ct);
+
+        if (slip is null) return null;
+
+        var itemIds = slip.Lines.Select(x => x.ItemId).Distinct().ToList();
+        var candidateItems = await _items.Query().AsNoTracking()
+            .Where(x => itemIds.Contains(x.ItemId) && x.Status == EntityStatus.Active)
+            .ToListAsync(ct);
+
+        var byItemId = candidateItems.ToDictionary(x => x.ItemId);
+        var suggestions = new List<SalesFreeIssueSuggestionLineDto>();
+
+        foreach (var line in slip.Lines.Where(x => x.Qty >= FreeIssueThreshold))
+        {
+            if (!byItemId.TryGetValue(line.ItemId, out var item)) continue;
+
+            var freeQty = Math.Floor(line.Qty / FreeIssueThreshold);
+            if (freeQty <= 0m) continue;
+
+            var rewardOptions = new List<SalesFreeIssueRewardOptionDto>
+            {
+                new(item.ItemId, item.Sku, item.Name, item.SalePrice)
+            };
+
+            var alternates = await _items.Query().AsNoTracking()
+                .Where(x => x.Status == EntityStatus.Active && x.CategoryId == item.CategoryId && x.ItemId != item.ItemId)
+                .OrderBy(x => x.Name)
+                .Take(3)
+                .Select(x => new SalesFreeIssueRewardOptionDto(x.ItemId, x.Sku, x.Name, x.SalePrice))
+                .ToListAsync(ct);
+
+            rewardOptions.AddRange(alternates.Where(x => rewardOptions.All(r => r.ItemId != x.ItemId)));
+
+            suggestions.Add(new SalesFreeIssueSuggestionLineDto(
+                line.SalesSlipLineId,
+                item.ItemId,
+                item.Sku,
+                item.Name,
+                line.Qty,
+                freeQty,
+                FreeIssueThreshold,
+                rewardOptions));
+        }
+
+        return suggestions.Count == 0
+            ? new SalesFreeIssueSuggestionDto(slip.SalesSlipId, slip.SlipNo, slip.SlipDate, Array.Empty<SalesFreeIssueSuggestionLineDto>())
+            : new SalesFreeIssueSuggestionDto(slip.SalesSlipId, slip.SlipNo, slip.SlipDate, suggestions);
+    }
+}

Backend/ERPCore/Services/SalesReportService.cs

@@ -0,0 +1,362 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Sales;
+using ERPCore.Repositories.Interfaces;
+using ERPCore.Services.Interfaces;
+using ERPCore.System.Errors;
+using Microsoft.EntityFrameworkCore;
+
+namespace ERPCore.Services;
+
+public sealed class SalesReportService : ISalesReportService
+{
+    private static readonly SalesReportDefinitionDto[] ReportDefinitions =
+    [
+        new("daily-summary", "Daily Summary", "Aggregated sales by day across posted invoices and slips.", ["from", "to"]),
+        new("item-summary", "Item Summary", "Aggregated sales by item across posted invoices and slips.", ["from", "to", "itemId", "warehouseId"]),
+        new("customer-summary", "Customer Summary", "Aggregated sales by customer across posted invoices and slips.", ["from", "to", "customerId"]),
+        new("warehouse-summary", "Warehouse Summary", "Aggregated sales by warehouse across posted invoices and slips.", ["from", "to", "warehouseId"]),
+        new("discount-summary", "Discount Summary", "Documents with discounts applied.", ["from", "to"]),
+        new("free-issue-summary", "Free Issue Summary", "Lines with free quantities issued.", ["from", "to"])
+    ];
+
+    private readonly IRepository<SalesInvoice> _invoices;
+    private readonly IRepository<SalesSlip> _slips;
+
+    public SalesReportService(IRepository<SalesInvoice> invoices, IRepository<SalesSlip> slips)
+    {
+        _invoices = invoices;
+        _slips = slips;
+    }
+
+    public IReadOnlyList<SalesReportDefinitionDto> ListReports() => ReportDefinitions;
+
+    public SalesReportDefinitionDto? GetReport(string reportId)
+    {
+        var normalized = reportId.Trim().ToLowerInvariant();
+        return ReportDefinitions.FirstOrDefault(r => r.Id == normalized);
+    }
+
+    public async Task<IReadOnlyList<object>> QueryAsync(string reportType, DateOnly from, DateOnly to, int? itemId, int? customerId, int? warehouseId, CancellationToken ct = default)
+    {
+        var normalized = reportType.Trim().ToLowerInvariant();
+        ValidateFilters(normalized, itemId, customerId, warehouseId);
+
+        return normalized switch
+        {
+            "daily" or "daily-summary" => (await DailySummaryAsync(from, to, ct)).Cast<object>().ToList(),
+            "item" or "item-summary" or "item-wise" => (await ItemSummaryAsync(from, to, itemId, warehouseId, ct)).Cast<object>().ToList(),
+            "customer" or "customer-summary" or "customer-wise" => (await CustomerSummaryAsync(from, to, customerId, ct)).Cast<object>().ToList(),
+            "warehouse" or "warehouse-summary" or "warehouse-wise" => (await WarehouseSummaryAsync(from, to, warehouseId, ct)).Cast<object>().ToList(),
+            "discount" or "discount-summary" => (await DiscountSummaryAsync(from, to, ct)).Cast<object>().ToList(),
+            "free-issue" or "free-issue-summary" => (await FreeIssueSummaryAsync(from, to, ct)).Cast<object>().ToList(),
+            _ => throw new DomainException("INVALID_REPORT_TYPE", $"Unsupported sales report type '{reportType}'.", 400)
+        };
+    }
+
+    private static void ValidateFilters(string reportType, int? itemId, int? customerId, int? warehouseId)
+    {
+        var allowed = reportType switch
+        {
+            "daily" or "daily-summary" => new FilterSet(false, false, false),
+            "item" or "item-summary" or "item-wise" => new FilterSet(true, false, true),
+            "customer" or "customer-summary" or "customer-wise" => new FilterSet(false, true, false),
+            "warehouse" or "warehouse-summary" or "warehouse-wise" => new FilterSet(false, false, true),
+            "discount" or "discount-summary" => new FilterSet(false, false, false),
+            "free-issue" or "free-issue-summary" => new FilterSet(false, false, false),
+            _ => throw new DomainException("INVALID_REPORT_TYPE", $"Unsupported sales report type '{reportType}'.", 400)
+        };
+
+        if (!allowed.Item && itemId is not null)
+            throw new DomainException("INVALID_REPORT_FILTER", $"Filter 'itemId' is not valid for report type '{reportType}'.", 400);
+        if (!allowed.Customer && customerId is not null)
+            throw new DomainException("INVALID_REPORT_FILTER", $"Filter 'customerId' is not valid for report type '{reportType}'.", 400);
+        if (!allowed.Warehouse && warehouseId is not null)
+            throw new DomainException("INVALID_REPORT_FILTER", $"Filter 'warehouseId' is not valid for report type '{reportType}'.", 400);
+    }
+
+    private readonly record struct FilterSet(bool Item, bool Customer, bool Warehouse);
+
+    public async Task<IReadOnlyList<SalesDailySummaryRowDto>> DailySummaryAsync(DateOnly from, DateOnly to, CancellationToken ct = default)
+    {
+        var invoiceRows = await _invoices.Query().AsNoTracking()
+            .Where(x => x.Status == SalesInvoiceStatus.Posted && x.InvoiceDate >= from.ToDateTime(TimeOnly.MinValue) && x.InvoiceDate < to.AddDays(1).ToDateTime(TimeOnly.MinValue))
+            .GroupBy(x => DateOnly.FromDateTime(x.InvoiceDate))
+            .Select(g => new
+            {
+                Date = g.Key,
+                InvoiceCount = g.Count(),
+                SlipCount = 0,
+                InvoiceSubtotal = g.Sum(x => x.Subtotal),
+                SlipSubtotal = 0m,
+                DiscountTotal = g.Sum(x => x.DiscountTotal),
+                FreeQtyTotal = g.Sum(x => x.Lines.Sum(l => l.FreeQty)),
+                TaxTotal = g.Sum(x => x.TaxTotal),
+                GrandTotal = g.Sum(x => x.GrandTotal)
+            })
+            .ToListAsync(ct);
+
+        var slipRows = await _slips.Query().AsNoTracking()
+            .Where(x => x.Status == SalesSlipStatus.Posted && x.SlipDate >= from.ToDateTime(TimeOnly.MinValue) && x.SlipDate < to.AddDays(1).ToDateTime(TimeOnly.MinValue))
+            .GroupBy(x => DateOnly.FromDateTime(x.SlipDate))
+            .Select(g => new
+            {
+                Date = g.Key,
+                InvoiceCount = 0,
+                SlipCount = g.Count(),
+                InvoiceSubtotal = 0m,
+                SlipSubtotal = g.Sum(x => x.Subtotal),
+                DiscountTotal = g.Sum(x => x.DiscountTotal),
+                FreeQtyTotal = g.Sum(x => x.Lines.Sum(l => l.FreeQty)),
+                TaxTotal = g.Sum(x => x.TaxTotal),
+                GrandTotal = g.Sum(x => x.GrandTotal)
+            })
+            .ToListAsync(ct);
+
+        return invoiceRows.Concat(slipRows)
+            .GroupBy(x => x.Date)
+            .OrderBy(x => x.Key)
+            .Select(g => new SalesDailySummaryRowDto(
+                g.Key,
+                g.Sum(x => x.InvoiceCount),
+                g.Sum(x => x.SlipCount),
+                g.Sum(x => x.InvoiceSubtotal),
+                g.Sum(x => x.SlipSubtotal),
+                g.Sum(x => x.DiscountTotal),
+                g.Sum(x => x.FreeQtyTotal),
+                g.Sum(x => x.TaxTotal),
+                g.Sum(x => x.GrandTotal)))
+            .ToList();
+    }
+
+    public async Task<IReadOnlyList<SalesItemSummaryRowDto>> ItemSummaryAsync(DateOnly from, DateOnly to, int? itemId, int? warehouseId, CancellationToken ct = default)
+    {
+        var invoiceRows = await _invoices.Query().AsNoTracking()
+            .Where(x => x.Status == SalesInvoiceStatus.Posted && x.InvoiceDate >= from.ToDateTime(TimeOnly.MinValue) && x.InvoiceDate < to.AddDays(1).ToDateTime(TimeOnly.MinValue))
+            .SelectMany(x => x.Lines.Select(l => new
+            {
+                l.ItemId,
+                l.Description,
+                l.Qty,
+                l.FreeQty,
+                Gross = l.Qty * l.UnitPrice,
+                l.DiscountAmount,
+                l.TaxAmount,
+                l.LineTotal,
+                x.WarehouseId
+            }))
+            .ToListAsync(ct);
+
+        if (warehouseId is not null)
+            invoiceRows = invoiceRows.Where(x => x.WarehouseId == warehouseId).ToList();
+        if (itemId is not null)
+            invoiceRows = invoiceRows.Where(x => x.ItemId == itemId).ToList();
+
+        var slipRows = await _slips.Query().AsNoTracking()
+            .Where(x => x.Status == SalesSlipStatus.Posted && x.SlipDate >= from.ToDateTime(TimeOnly.MinValue) && x.SlipDate < to.AddDays(1).ToDateTime(TimeOnly.MinValue))
+            .SelectMany(x => x.Lines.Select(l => new
+            {
+                l.ItemId,
+                l.Description,
+                l.Qty,
+                l.FreeQty,
+                Gross = l.Qty * l.UnitPrice,
+                l.DiscountAmount,
+                l.TaxAmount,
+                l.LineTotal,
+                x.WarehouseId
+            }))
+            .ToListAsync(ct);
+
+        if (warehouseId is not null)
+            slipRows = slipRows.Where(x => x.WarehouseId == warehouseId).ToList();
+        if (itemId is not null)
+            slipRows = slipRows.Where(x => x.ItemId == itemId).ToList();
+
+        return invoiceRows.Concat(slipRows)
+            .GroupBy(x => new { x.ItemId, x.Description })
+            .OrderByDescending(g => g.Sum(x => x.LineTotal) + g.Sum(x => x.TaxAmount))
+            .Select(g => new SalesItemSummaryRowDto(
+                g.Key.ItemId,
+                g.Key.Description,
+                g.Sum(x => x.Qty),
+                g.Sum(x => x.FreeQty),
+                g.Sum(x => x.Gross),
+                g.Sum(x => x.DiscountAmount),
+                g.Sum(x => x.TaxAmount),
+                g.Sum(x => x.LineTotal) + g.Sum(x => x.TaxAmount)))
+            .ToList();
+    }
+
+    public async Task<IReadOnlyList<SalesCustomerSummaryRowDto>> CustomerSummaryAsync(DateOnly from, DateOnly to, int? customerId, CancellationToken ct = default)
+    {
+        var invoiceQuery = _invoices.Query().AsNoTracking()
+            .Where(x => x.Status == SalesInvoiceStatus.Posted && x.InvoiceDate >= from.ToDateTime(TimeOnly.MinValue) && x.InvoiceDate < to.AddDays(1).ToDateTime(TimeOnly.MinValue));
+        if (customerId is not null) invoiceQuery = invoiceQuery.Where(x => x.CustomerId == customerId);
+
+        var slipQuery = _slips.Query().AsNoTracking()
+            .Where(x => x.Status == SalesSlipStatus.Posted && x.SlipDate >= from.ToDateTime(TimeOnly.MinValue) && x.SlipDate < to.AddDays(1).ToDateTime(TimeOnly.MinValue));
+        if (customerId is not null) slipQuery = slipQuery.Where(x => x.CustomerId == customerId);
+
+        var invoiceRows = await invoiceQuery
+            .GroupBy(x => new { x.CustomerId, x.CustomerSnapshotName })
+            .Select(g => new
+            {
+                g.Key.CustomerId,
+                CustomerName = g.Key.CustomerSnapshotName,
+                InvoiceCount = g.Count(),
+                SlipCount = 0,
+                SoldQty = g.Sum(x => x.Lines.Sum(l => l.Qty)),
+                FreeQty = g.Sum(x => x.Lines.Sum(l => l.FreeQty)),
+                GrossAmount = g.Sum(x => x.Subtotal),
+                DiscountTotal = g.Sum(x => x.DiscountTotal),
+                TaxTotal = g.Sum(x => x.TaxTotal),
+                NetAmount = g.Sum(x => x.GrandTotal)
+            })
+            .ToListAsync(ct);
+
+        var slipRows = await slipQuery
+            .GroupBy(x => new { x.CustomerId, x.CustomerSnapshotName })
+            .Select(g => new
+            {
+                g.Key.CustomerId,
+                CustomerName = g.Key.CustomerSnapshotName,
+                InvoiceCount = 0,
+                SlipCount = g.Count(),
+                SoldQty = g.Sum(x => x.Lines.Sum(l => l.Qty)),
+                FreeQty = g.Sum(x => x.Lines.Sum(l => l.FreeQty)),
+                GrossAmount = g.Sum(x => x.Subtotal),
+                DiscountTotal = g.Sum(x => x.DiscountTotal),
+                TaxTotal = g.Sum(x => x.TaxTotal),
+                NetAmount = g.Sum(x => x.GrandTotal)
+            })
+            .ToListAsync(ct);
+
+        return invoiceRows.Concat(slipRows)
+            .GroupBy(x => new { x.CustomerId, x.CustomerName })
+            .OrderByDescending(g => g.Sum(x => x.NetAmount))
+            .Select(g => new SalesCustomerSummaryRowDto(
+                g.Key.CustomerId,
+                g.Key.CustomerName,
+                g.Sum(x => x.InvoiceCount),
+                g.Sum(x => x.SlipCount),
+                g.Sum(x => x.SoldQty),
+                g.Sum(x => x.FreeQty),
+                g.Sum(x => x.GrossAmount),
+                g.Sum(x => x.DiscountTotal),
+                g.Sum(x => x.TaxTotal),
+                g.Sum(x => x.NetAmount)))
+            .ToList();
+    }
+
+    public async Task<IReadOnlyList<SalesWarehouseSummaryRowDto>> WarehouseSummaryAsync(DateOnly from, DateOnly to, int? warehouseId, CancellationToken ct = default)
+    {
+        var invoiceQuery = _invoices.Query().AsNoTracking()
+            .Where(x => x.Status == SalesInvoiceStatus.Posted && x.InvoiceDate >= from.ToDateTime(TimeOnly.MinValue) && x.InvoiceDate < to.AddDays(1).ToDateTime(TimeOnly.MinValue));
+        if (warehouseId is not null) invoiceQuery = invoiceQuery.Where(x => x.WarehouseId == warehouseId);
+
+        var slipQuery = _slips.Query().AsNoTracking()
+            .Where(x => x.Status == SalesSlipStatus.Posted && x.SlipDate >= from.ToDateTime(TimeOnly.MinValue) && x.SlipDate < to.AddDays(1).ToDateTime(TimeOnly.MinValue));
+        if (warehouseId is not null) slipQuery = slipQuery.Where(x => x.WarehouseId == warehouseId);
+
+        var invoiceRows = await invoiceQuery
+            .GroupBy(x => new { x.WarehouseId, x.Warehouse!.Name })
+            .Select(g => new
+            {
+                g.Key.WarehouseId,
+                WarehouseName = g.Key.Name,
+                InvoiceCount = g.Count(),
+                SlipCount = 0,
+                SoldQty = g.Sum(x => x.Lines.Sum(l => l.Qty)),
+                FreeQty = g.Sum(x => x.Lines.Sum(l => l.FreeQty)),
+                GrossAmount = g.Sum(x => x.Subtotal),
+                DiscountTotal = g.Sum(x => x.DiscountTotal),
+                TaxTotal = g.Sum(x => x.TaxTotal),
+                NetAmount = g.Sum(x => x.GrandTotal)
+            })
+            .ToListAsync(ct);
+
+        var slipRows = await slipQuery
+            .GroupBy(x => new { x.WarehouseId, x.Warehouse!.Name })
+            .Select(g => new
+            {
+                g.Key.WarehouseId,
+                WarehouseName = g.Key.Name,
+                InvoiceCount = 0,
+                SlipCount = g.Count(),
+                SoldQty = g.Sum(x => x.Lines.Sum(l => l.Qty)),
+                FreeQty = g.Sum(x => x.Lines.Sum(l => l.FreeQty)),
+                GrossAmount = g.Sum(x => x.Subtotal),
+                DiscountTotal = g.Sum(x => x.DiscountTotal),
+                TaxTotal = g.Sum(x => x.TaxTotal),
+                NetAmount = g.Sum(x => x.GrandTotal)
+            })
+            .ToListAsync(ct);
+
+        return invoiceRows.Concat(slipRows)
+            .GroupBy(x => new { x.WarehouseId, x.WarehouseName })
+            .OrderByDescending(g => g.Sum(x => x.NetAmount))
+            .Select(g => new SalesWarehouseSummaryRowDto(
+                g.Key.WarehouseId,
+                g.Key.WarehouseName,
+                g.Sum(x => x.InvoiceCount),
+                g.Sum(x => x.SlipCount),
+                g.Sum(x => x.SoldQty),
+                g.Sum(x => x.FreeQty),
+                g.Sum(x => x.GrossAmount),
+                g.Sum(x => x.DiscountTotal),
+                g.Sum(x => x.TaxTotal),
+                g.Sum(x => x.NetAmount)))
+            .ToList();
+    }
+
+    public async Task<IReadOnlyList<SalesDiscountSummaryRowDto>> DiscountSummaryAsync(DateOnly from, DateOnly to, CancellationToken ct = default)
+    {
+        var invoices = await _invoices.Query().AsNoTracking()
+            .Where(x => x.Status == SalesInvoiceStatus.Posted && x.InvoiceDate >= from.ToDateTime(TimeOnly.MinValue) && x.InvoiceDate < to.AddDays(1).ToDateTime(TimeOnly.MinValue) && x.DiscountTotal > 0m)
+            .Select(x => new SalesDiscountSummaryRowDto("Invoice", x.InvoiceNo, x.InvoiceDate, x.CustomerSnapshotName, x.Subtotal, x.DiscountTotal, x.TaxTotal, x.GrandTotal))
+            .ToListAsync(ct);
+
+        var slips = await _slips.Query().AsNoTracking()
+            .Where(x => x.Status == SalesSlipStatus.Posted && x.SlipDate >= from.ToDateTime(TimeOnly.MinValue) && x.SlipDate < to.AddDays(1).ToDateTime(TimeOnly.MinValue) && x.DiscountTotal > 0m)
+            .Select(x => new SalesDiscountSummaryRowDto("Slip", x.SlipNo, x.SlipDate, x.CustomerSnapshotName, x.Subtotal, x.DiscountTotal, x.TaxTotal, x.GrandTotal))
+            .ToListAsync(ct);
+
+        return invoices.Concat(slips).OrderByDescending(x => x.DiscountTotal).ToList();
+    }
+
+    public async Task<IReadOnlyList<SalesFreeIssueSummaryRowDto>> FreeIssueSummaryAsync(DateOnly from, DateOnly to, CancellationToken ct = default)
+    {
+        var invoiceRows = await _invoices.Query().AsNoTracking()
+            .Where(x => x.Status == SalesInvoiceStatus.Posted && x.InvoiceDate >= from.ToDateTime(TimeOnly.MinValue) && x.InvoiceDate < to.AddDays(1).ToDateTime(TimeOnly.MinValue))
+            .SelectMany(x => x.Lines.Where(l => l.FreeQty > 0m).Select(l => new SalesFreeIssueSummaryRowDto(
+                "Invoice",
+                x.InvoiceNo,
+                x.InvoiceDate,
+                x.CustomerSnapshotName,
+                l.ItemId,
+                l.Description,
+                l.FreeQty,
+                l.FreeQty * l.UnitPrice,
+                l.WarehouseId,
+                x.Warehouse!.Name)))
+            .ToListAsync(ct);
+
+        var slipRows = await _slips.Query().AsNoTracking()
+            .Where(x => x.Status == SalesSlipStatus.Posted && x.SlipDate >= from.ToDateTime(TimeOnly.MinValue) && x.SlipDate < to.AddDays(1).ToDateTime(TimeOnly.MinValue))
+            .SelectMany(x => x.Lines.Where(l => l.FreeQty > 0m).Select(l => new SalesFreeIssueSummaryRowDto(
+                "Slip",
+                x.SlipNo,
+                x.SlipDate,
+                x.CustomerSnapshotName,
+                l.ItemId,
+                l.Description,
+                l.FreeQty,
+                l.FreeQty * l.UnitPrice,
+                l.WarehouseId,
+                x.Warehouse!.Name)))
+            .ToListAsync(ct);
+
+        return invoiceRows.Concat(slipRows).OrderByDescending(x => x.FreeQty).ToList();
+    }
+}

Backend/ERPCore/Services/SalesSlipService.cs

@@ -0,0 +1,270 @@
+using ERPCore.Common.Http;
+using ERPCore.Domain;
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Sales;
+using ERPCore.Infra.Auth;
+using ERPCore.Infra.UoW;
+using ERPCore.Repositories.Interfaces;
+using ERPCore.Services.Interfaces;
+using ERPCore.Services.Stock;
+using ERPCore.System.Errors;
+using Microsoft.EntityFrameworkCore;
+
+namespace ERPCore.Services;
+
+public sealed class SalesSlipService : ISalesSlipService
+{
+    private readonly IRepository<SalesSlip> _slips;
+    private readonly IRepository<Customer> _customers;
+    private readonly IRepository<Item> _items;
+    private readonly IRepository<Uom> _uoms;
+    private readonly IRepository<Warehouse> _warehouses;
+    private readonly IRepository<User> _users;
+    private readonly ISalesDomainService _sales;
+    private readonly ISalesPostingService _posting;
+    private readonly ISalesMappingService _mapping;
+    private readonly ISalesDocumentWorkflowService _workflow;
+    private readonly ICurrentUser _currentUser;
+    private readonly INumberSequenceService _numbers;
+    private readonly IUnitOfWork _uow;
+
+    public SalesSlipService(
+        IRepository<SalesSlip> slips, IRepository<Customer> customers, IRepository<Item> items,
+        IRepository<Uom> uoms, IRepository<Warehouse> warehouses, IRepository<User> users, ISalesDomainService sales, ISalesPostingService posting, ISalesMappingService mapping,
+        ISalesDocumentWorkflowService workflow,
+        ICurrentUser currentUser, INumberSequenceService numbers, IUnitOfWork uow)
+    {
+        _slips = slips;
+        _customers = customers;
+        _items = items;
+        _uoms = uoms;
+        _warehouses = warehouses;
+        _users = users;
+        _sales = sales;
+        _posting = posting;
+        _mapping = mapping;
+        _workflow = workflow;
+        _currentUser = currentUser;
+        _numbers = numbers;
+        _uow = uow;
+    }
+
+    public async Task<PagedResponse<SalesSlipSummaryDto>> ListAsync(PageQuery query, SalesSlipStatus? status, int? customerId, int? warehouseId, CancellationToken ct = default)
+    {
+        IQueryable<SalesSlip> q = _slips.Query().AsNoTracking().Include(x => x.Lines);
+        if (!string.IsNullOrWhiteSpace(query.Q))
+        {
+            var term = query.Q.Trim();
+            q = q.Where(x => EF.Functions.ILike(x.SlipNo, $"%{term}%") || EF.Functions.ILike(x.CustomerSnapshotName, $"%{term}%"));
+        }
+        if (status is not null) q = q.Where(x => x.Status == status);
+        if (customerId is not null) q = q.Where(x => x.CustomerId == customerId);
+        if (warehouseId is not null) q = q.Where(x => x.WarehouseId == warehouseId);
+
+        var total = await q.CountAsync(ct);
+        var rows = await q.OrderByDescending(x => x.SalesSlipId).Skip(query.Skip).Take(query.PageSize).ToListAsync(ct);
+        return PagedResponse<SalesSlipSummaryDto>.Create(rows.Select(MapSummary).ToList(), query.Page, query.PageSize, total);
+    }
+
+    public async Task<ETagged<SalesSlipDto>?> GetAsync(int salesSlipId, CancellationToken ct = default)
+    {
+        var slip = await _slips.Query().AsNoTracking().Include(x => x.Lines)
+            .FirstOrDefaultAsync(x => x.SalesSlipId == salesSlipId, ct);
+        return slip is null ? null : new ETagged<SalesSlipDto>(_mapping.MapSlip(slip), slip.RowVersion);
+    }
+
+    public async Task<PagedResponse<FreeIssueSummaryDto>> ListFreeIssuesAsync(PageQuery query, SalesSlipStatus? status, int? customerId, int? warehouseId, CancellationToken ct = default)
+    {
+        IQueryable<SalesSlip> q = _slips.Query().AsNoTracking().Include(x => x.Lines);
+        q = q.Where(x => x.Lines.Any(l => l.IsFreeIssue || l.FreeQty > 0m));
+        if (!string.IsNullOrWhiteSpace(query.Q))
+        {
+            var term = query.Q.Trim();
+            q = q.Where(x => EF.Functions.ILike(x.SlipNo, $"%{term}%") || EF.Functions.ILike(x.CustomerSnapshotName, $"%{term}%"));
+        }
+        if (status is not null) q = q.Where(x => x.Status == status);
+        if (customerId is not null) q = q.Where(x => x.CustomerId == customerId);
+        if (warehouseId is not null) q = q.Where(x => x.WarehouseId == warehouseId);
+
+        var total = await q.CountAsync(ct);
+        var rows = await q.OrderByDescending(x => x.SalesSlipId).Skip(query.Skip).Take(query.PageSize).ToListAsync(ct);
+        return PagedResponse<FreeIssueSummaryDto>.Create(rows.Select(MapFreeIssueSummary).ToList(), query.Page, query.PageSize, total);
+    }
+
+    public async Task<ETagged<FreeIssueDto>?> GetFreeIssueAsync(int salesSlipId, CancellationToken ct = default)
+    {
+        var slip = await _slips.Query().AsNoTracking().Include(x => x.Lines)
+            .FirstOrDefaultAsync(x => x.SalesSlipId == salesSlipId, ct);
+        return slip is null ? null : new ETagged<FreeIssueDto>(MapFreeIssue(slip), slip.RowVersion);
+    }
+
+    public Task<SalesSlipPostingCheckDto> CheckPostingAsync(int salesSlipId, CancellationToken ct = default)
+        => _posting.CheckSlipAsync(salesSlipId, ct);
+
+    public async Task<ETagged<SalesSlipDto>> CreateAsync(CreateSalesSlipRequest request, CancellationToken ct = default)
+    {
+        await _sales.ValidateSalesHeaderAsync(request.CustomerId, request.WarehouseId, request.CashierUserId, true, ct);
+
+        var slip = new SalesSlip
+        {
+            SlipNo = await _numbers.NextAsync(DocumentTypes.SalesSlip, ct),
+            SlipDate = DateTime.UtcNow,
+            CustomerId = request.CustomerId,
+            WarehouseId = request.WarehouseId,
+            CashierUserId = request.CashierUserId,
+            Status = SalesSlipStatus.Draft,
+            CreatedAt = DateTime.UtcNow
+        };
+        slip.CustomerSnapshotName = await _customers.Query().Where(x => x.CustomerId == request.CustomerId).Select(x => x.DisplayName ?? x.Name).FirstAsync(ct);
+        slip.Lines = await BuildLinesAsync(request.WarehouseId, request.Lines, ct);
+        Recalculate(slip);
+
+        await _slips.AddAsync(slip, ct);
+        await _uow.SaveChangesAsync(ct);
+        return new ETagged<SalesSlipDto>(_mapping.MapSlip(slip), slip.RowVersion);
+    }
+
+    public async Task<ETagged<SalesSlipDto>> UpdateAsync(int salesSlipId, UpdateSalesSlipRequest request, uint expectedRowVersion, CancellationToken ct = default)
+    {
+        var slip = await _workflow.LoadEditableSlipAsync(salesSlipId, expectedRowVersion, ct);
+
+        await _sales.ValidateSalesHeaderAsync(request.CustomerId, request.WarehouseId, request.CashierUserId, true, ct);
+        slip.CustomerId = request.CustomerId;
+        slip.WarehouseId = request.WarehouseId;
+        slip.CashierUserId = request.CashierUserId;
+        slip.CustomerSnapshotName = await _customers.Query().Where(x => x.CustomerId == request.CustomerId).Select(x => x.DisplayName ?? x.Name).FirstAsync(ct);
+        slip.Lines.Clear();
+        foreach (var line in await BuildLinesAsync(request.WarehouseId, request.Lines, ct)) slip.Lines.Add(line);
+        Recalculate(slip);
+        slip.UpdatedAt = DateTime.UtcNow;
+        await _uow.SaveChangesAsync(ct);
+        return new ETagged<SalesSlipDto>(_mapping.MapSlip(slip), slip.RowVersion);
+    }
+
+    public async Task<SalesSlipDto> PostAsync(int salesSlipId, CancellationToken ct = default)
+        {
+            await _posting.PostSlipAsync(salesSlipId, ct);
+            var slip = await _slips.Query().AsNoTracking().Include(x => x.Lines)
+                .FirstAsync(x => x.SalesSlipId == salesSlipId, ct);
+            return _mapping.MapSlip(slip);
+        }
+
+    public async Task<SalesSlipDto> CancelAsync(int salesSlipId, CancellationToken ct = default)
+    {
+        var slip = await _slips.Query().Include(x => x.Lines).FirstOrDefaultAsync(x => x.SalesSlipId == salesSlipId, ct)
+            ?? throw new NotFoundException($"Sales slip {salesSlipId} was not found.");
+        if (slip.Status != SalesSlipStatus.Draft)
+            throw new ConflictException($"Sales slip {salesSlipId} is {slip.Status} and cannot be cancelled.");
+        slip.Status = SalesSlipStatus.Cancelled;
+        slip.UpdatedAt = DateTime.UtcNow;
+        await _uow.SaveChangesAsync(ct);
+        return _mapping.MapSlip(slip);
+    }
+
+    private async Task<List<SalesSlipLine>> BuildLinesAsync(int headerWarehouseId, List<CreateSalesSlipLineRequest> requests, CancellationToken ct)
+    {
+        var lines = new List<SalesSlipLine>();
+        foreach (var r in requests)
+        {
+            var item = await _items.Query().AsNoTracking().FirstAsync(x => x.ItemId == r.ItemId, ct);
+            await _sales.ValidateSalesLineAsync(headerWarehouseId, r.ItemId, r.UomId, r.WarehouseId, r.Qty, r.FreeQty, r.ParentLineId, ct);
+            var resolved = await _sales.ResolveLinePriceAsync(r.ItemId, r.WarehouseId, r.UnitPrice, r.AllowManualPriceOverride, ct);
+            var unitPrice = resolved.UnitPrice;
+            var priceSource = resolved.PriceSource;
+
+            var calc = _sales.ComputeLine(r.Qty, r.FreeQty, unitPrice, r.DiscountMode, r.DiscountPct, r.DiscountValue, r.DiscountAmount, r.TaxPct, r.IsFreeIssue);
+
+            lines.Add(new SalesSlipLine
+            {
+                ItemId = r.ItemId,
+                Description = item.Name,
+                Qty = r.Qty,
+                FreeQty = r.FreeQty,
+                UomId = r.UomId,
+                WarehouseId = r.WarehouseId,
+                UnitPrice = unitPrice,
+                BaseCost = unitPrice,
+                PriceSource = priceSource,
+                DiscountMode = r.DiscountMode,
+                DiscountPct = r.DiscountPct,
+                DiscountAmount = calc.DiscountTotal,
+                NetUnitPrice = calc.NetUnitPrice,
+                LineTotal = calc.LineTotal,
+                TaxPct = r.TaxPct,
+                TaxAmount = calc.TaxAmount,
+                IsFreeIssue = r.IsFreeIssue,
+                ParentLineId = r.ParentLineId
+            });
+        }
+        return lines;
+    }
+
+    private static void Recalculate(SalesSlip slip)
+    {
+        slip.Subtotal = slip.Lines.Sum(x => x.Qty * x.UnitPrice);
+        slip.DiscountTotal = slip.Lines.Sum(x => x.DiscountAmount);
+        slip.TaxTotal = slip.Lines.Sum(x => x.TaxAmount);
+        slip.GrandTotal = slip.Lines.Sum(x => x.LineTotal) + slip.TaxTotal;
+        slip.PaidAmount = 0m;
+        slip.BalanceAmount = slip.GrandTotal - slip.PaidAmount;
+    }
+
+    private SalesSlipSummaryDto MapSummary(SalesSlip x) => new(
+        x.SalesSlipId, x.SlipNo, x.SlipDate, x.CustomerId, x.CustomerSnapshotName, x.WarehouseId, x.Status,
+        _mapping.MapSlipTotals(x), x.CreatedAt);
+
+    private FreeIssueSummaryDto MapFreeIssueSummary(SalesSlip x)
+    {
+        var line = x.Lines.FirstOrDefault();
+        var item = line is null ? null : _items.Query().AsNoTracking()
+            .Where(i => i.ItemId == line.ItemId)
+            .Select(i => new { i.ItemId, i.Sku, i.Name, i.BaseUomId })
+            .FirstOrDefault();
+        var uom = line is null ? null : _uoms.Query().AsNoTracking()
+            .Where(u => u.UomId == line.UomId)
+            .Select(u => new { u.UomId, u.Name })
+            .FirstOrDefault();
+        var warehouse = _warehouses.Query().AsNoTracking()
+            .Where(w => w.WarehouseId == x.WarehouseId)
+            .Select(w => new { w.WarehouseId, w.Name })
+            .FirstOrDefault();
+        return new FreeIssueSummaryDto(
+            x.SalesSlipId,
+            x.SlipNo,
+            x.Status,
+            x.CreatedAt,
+            x.WarehouseId,
+            warehouse?.Name ?? $"Warehouse {x.WarehouseId}",
+            line?.ItemId ?? 0,
+            item?.Sku ?? $"SKU-{line?.ItemId ?? 0}",
+            item?.Name ?? line?.Description ?? "—",
+            line?.UomId ?? 0,
+            uom?.Name ?? $"UOM {line?.UomId ?? 0}",
+            line?.Qty ?? 0m,
+            line?.FreeQty ?? 0m,
+            line is null ? "No line" : $"Buy {line.Qty} Get {line.FreeQty}");
+    }
+
+    private FreeIssueDto MapFreeIssue(SalesSlip x)
+    {
+        var summary = MapFreeIssueSummary(x);
+        return new FreeIssueDto(
+            x.SalesSlipId,
+            x.SlipNo,
+            x.SlipDate,
+            x.Status,
+            x.CustomerId,
+            x.CustomerSnapshotName,
+            x.WarehouseId,
+            summary.WarehouseName,
+            x.CashierUserId,
+            x.CreatedAt,
+            x.UpdatedAt,
+            summary,
+            x.Lines.Select(l => new SalesSlipLineDto(l.SalesSlipLineId, l.ItemId, l.Description, l.Qty, l.FreeQty, l.UomId, l.WarehouseId, l.UnitPrice, l.BaseCost, l.PriceSource, l.DiscountPct, l.DiscountAmount, l.DiscountMode, l.NetUnitPrice, l.LineTotal, l.TaxPct, l.TaxAmount, l.IsFreeIssue, l.ParentLineId)).ToList());
+    }
+
+    private SalesSlipDto Map(SalesSlip x) => _mapping.MapSlip(x);
+}

Backend/ERPCore/appsettings.Development.json

@@ -6,7 +6,7 @@
     }
   },
   "ConnectionStrings": {
-    "DefaultConnection": "Host=localhost;Port=5432;Database=ERPCore;Username=postgres;Password=dbuser"
+    "DefaultConnection": "Host=localhost;Port=5432;Database=ERPCoreTest;Username=postgres;Password=root"
   },
   "AuthHex": {
     "BaseUrl": "http://localhost:5011"

Backend/ERPCore/package-lock.json

@@ -0,0 +1,6 @@
+{
+  "name": "ERPCore",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {}
+}

Backend/PROGRESS.md

@@ -4,6 +4,11 @@ Legend: `[ ]` not started · `[~]` in progress · `[x]` done
 Spec: `docs/10-BACKEND-PHASE1.md` (model + rules) · `docs/11-BACKEND-PHASE1.md` (API)
 Convention: `docs/01-DOC-GUIDE.md §6`. Update this file in the **same commit** as the code. When ticking `[x]`, append a short note + any deviation.
 
+## 8. Sales
+- [x] Sales bootstrap data seeded locally for development: warehouses, UOMs, categories, items, customers, current-year `SI`/`SSL` sequences, plus sample invoice/slip headers and lines. Existing data is preserved.
+- [x] Sales report API consolidated into `GET /api/v1/reports/sales` (catalog), `GET /api/v1/reports/sales/{reportId}` (report metadata), and `POST /api/v1/reports/sales/query` (filtered data). Legacy per-report GET routes removed; invalid report/filter combinations now fail validation.
+- [x] Free-issue CRUD exposed as `api/v1/free-issues` as a thin alias over sales slips. Free issue remains a line-level `IsFreeIssue` / `FreeQty` behavior, not a separate table.
+
 ## 0. Bootstrap
 - [x] Solution + Web API project (`net10.0`), packages restored (00-CORE §5.4)
 - [x] Folder structure per 00-CORE §5.3

Frontend/PROGRESS.md

@@ -42,6 +42,13 @@ Convention: `docs/01-DOC-GUIDE.md §6`. Update this file in the **same commit**
 - [~] 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
 
+## 3.5 Sales screens
+- [~] Sales hub (`app/dashboard/sales`) — new module entry point linking to invoices, slips, free issues, and reports
+- [~] Sales invoices (`app/dashboard/sales/invoices`, `/new`, `/[id]`) — list/detail/create/edit routing wired to the real sales invoice API, including save/post/cancel on the detail page
+- [~] Sales slips (`app/dashboard/sales/slips`, `/new`, `/[id]`) — list/detail/create/edit routing wired to the real sales slip API, including save/post/cancel on the detail page
+- [~] Free issues (`app/dashboard/sales/free-issues`, `/new`, `/[id]`) — alias-only surface over sales slips for free-issue handling; edit/save/post/cancel stays on the slip screen
+- [~] Sales reports (`app/dashboard/sales/reports`, `/[reportId]`) — report catalog + report metadata view wired to `/reports/sales`
+
 ## 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, **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.

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

@@ -170,6 +170,7 @@ export default function EmployeeDetailPage() {
         emergencyContactName: employee.emergencyContactName,
         emergencyContactRelationship: employee.emergencyContactRelationship,
         emergencyContactPhone: employee.emergencyContactPhone,
+        hireDate: employee.hireDate,
         confirmationDate: employee.confirmationDate,
         lastWorkingDate: employee.lastWorkingDate,
         departmentId: employee.departmentId,

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

@@ -1,6 +1,6 @@
 "use client"
 
-import { useCallback, useEffect, useMemo, useState } from "react"
+import { Suspense, useCallback, useEffect, useMemo, useState } from "react"
 import { useParams, useRouter, useSearchParams } from "next/navigation"
 import Link from "next/link"
 import {
@@ -142,7 +142,7 @@ function stagesNamedIn(detail: string | undefined, stageNodes: Node[]): Set<stri
   return new Set(named.map((n) => n.id))
 }
 
-export default function TemplateBuilderPage() {
+function TemplateBuilderContent() {
   const params = useParams<{ id: string }>()
   const searchParams = useSearchParams()
   const router = useRouter()
@@ -808,3 +808,11 @@ export default function TemplateBuilderPage() {
     </div>
   )
 }
+
+export default function TemplateBuilderPage() {
+  return (
+    <Suspense fallback={<Skeleton className="h-[60vh] w-full rounded-2xl" />}>
+      <TemplateBuilderContent />
+    </Suspense>
+  )
+}

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

@@ -0,0 +1,355 @@
+"use client"
+
+import { useEffect, useMemo, useState } from "react"
+import Link from "next/link"
+import { useParams, useRouter } from "next/navigation"
+import { ArrowLeft, CheckCircle2, Edit, Minus, Plus, Printer, Save, XCircle } from "lucide-react"
+
+import { bundleApi } from "@/lib/api/bundles"
+import { itemsApi } from "@/lib/api/items"
+import { uomsApi } from "@/lib/api/uoms"
+import { errorMessage } from "@/lib/error-map"
+import { Button, buttonVariants } from "@/components/ui/button"
+import { Badge } from "@/components/ui/badge"
+import { Input } from "@/components/ui/input"
+import { Label } from "@/components/ui/label"
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select"
+import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from "@/components/ui/table"
+import { cn } from "@/lib/utils"
+import { BundleSale, BundleSaleTemplateSummary, BundleSaleTemplateLine, UpdateBundleSaleRequest } from "@/types/bundles"
+import { customersApi } from "@/lib/api/customers"
+import { warehousesApi } from "@/lib/api/warehouses"
+import { usersApi } from "@/lib/api/users"
+import { Customer } from "@/types/customers"
+import { ItemListItem, Uom, Warehouse } from "@/types/master-data"
+import { ManagedUser } from "@/types/users"
+
+type EditableLine = BundleSaleTemplateLine & { key: string }
+
+function statusClass(status: BundleSale["status"]) {
+  switch (status) {
+    case "Draft":
+      return "border-amber-200 bg-amber-50 text-amber-800"
+    case "Posted":
+      return "border-emerald-200 bg-emerald-50 text-emerald-800"
+    case "Cancelled":
+      return "border-rose-200 bg-rose-50 text-rose-800"
+  }
+}
+
+export default function BundleSaleDetailPage() {
+  const router = useRouter()
+  const params = useParams<{ id: string }>()
+  const bundleSaleId = Number(params.id)
+  const [bundle, setBundle] = useState<BundleSale | null>(null)
+  const [editing, setEditing] = useState(false)
+  const [templates, setTemplates] = useState<BundleSaleTemplateSummary[]>([])
+  const [customers, setCustomers] = useState<Customer[]>([])
+  const [items, setItems] = useState<ItemListItem[]>([])
+  const [uoms, setUoms] = useState<Uom[]>([])
+  const [warehouses, setWarehouses] = useState<Warehouse[]>([])
+  const [users, setUsers] = useState<ManagedUser[]>([])
+  const [customerId, setCustomerId] = useState<number | null>(null)
+  const [warehouseId, setWarehouseId] = useState<number | null>(null)
+  const [cashierUserId, setCashierUserId] = useState<number | null>(null)
+  const [templateId, setTemplateId] = useState<number | null>(null)
+  const [bundleName, setBundleName] = useState("")
+  const [bundlePrice, setBundlePrice] = useState(0)
+  const [allowPriceOverride, setAllowPriceOverride] = useState(false)
+  const [lines, setLines] = useState<EditableLine[]>([])
+  const [error, setError] = useState<string | null>(null)
+  const [busy, setBusy] = useState(false)
+
+  useEffect(() => {
+    if (!Number.isFinite(bundleSaleId)) {
+      setError(`Invalid bundle id '${params.id}'.`)
+      return
+    }
+    Promise.all([
+      bundleApi.getBundle(bundleSaleId),
+      bundleApi.listTemplates({ pageSize: 200 }),
+      customersApi.list({ pageSize: 200 }),
+      itemsApi.list({ pageSize: 200 }),
+      uomsApi.list({ pageSize: 200 }),
+      warehousesApi.list({ pageSize: 200 }),
+      usersApi.list({ pageSize: 200 }),
+    ])
+      .then(([bundleRes, templateRes, custRes, itemRes, uomRes, whRes, userRes]) => {
+        const data = bundleRes
+        setBundle(data)
+        setTemplates(templateRes.items)
+        setCustomers(custRes.items)
+        setItems(itemRes.items)
+        setUoms(uomRes.items)
+        setWarehouses(whRes.items)
+        setUsers(userRes.items)
+        setCustomerId(data.customerId)
+        setWarehouseId(data.warehouseId)
+        setCashierUserId(data.cashierUserId)
+        setTemplateId(data.bundleSaleTemplateId)
+        setBundleName(data.bundleName)
+        setBundlePrice(data.bundlePrice)
+        setLines(
+          data.lines.map((line) => ({
+            key: `${line.bundleSaleLineId}`,
+            bundleSaleTemplateLineId: line.bundleSaleLineId,
+            itemId: line.itemId,
+            uomId: line.uomId,
+            warehouseId: line.warehouseId,
+            qty: line.qty,
+            unitPrice: line.unitPrice,
+            includeInBundle: line.includeInBundle,
+            sortOrder: line.bundleSaleLineId,
+          }))
+        )
+      })
+      .catch((err) => setError(errorMessage(err)))
+  }, [bundleSaleId, params.id])
+
+  const templateLabel = useMemo(() => templates.find((t) => t.bundleSaleTemplateId === templateId)?.templateName ?? "Template", [templates, templateId])
+  const componentSubtotal = useMemo(() => lines.reduce((sum, line) => sum + Number(line.qty || 0) * Number(line.unitPrice || 0), 0), [lines])
+  const isDraft = bundle?.status === "Draft"
+  const canEdit = isDraft
+
+  function updateLine(key: string, patch: Partial<EditableLine>) {
+    setLines((prev) => prev.map((line) => (line.key === key ? { ...line, ...patch } : line)))
+  }
+
+  function addLine() {
+    const source = lines[lines.length - 1]
+    if (!source) return
+    setLines((prev) => [...prev, { ...source, key: crypto.randomUUID() }])
+  }
+
+  function removeLine(key: string) {
+    setLines((prev) => (prev.length === 1 ? prev : prev.filter((line) => line.key !== key)))
+  }
+
+  async function saveBundle() {
+    if (!bundle || !customerId || !warehouseId || !cashierUserId || !templateId) return
+    setBusy(true)
+    setError(null)
+    try {
+      const request: UpdateBundleSaleRequest = {
+        customerId,
+        warehouseId,
+        cashierUserId,
+        bundleSaleTemplateId: templateId,
+        bundleName,
+        bundlePrice,
+        allowPriceOverride,
+        lines: lines.map(({ key, ...line }) => line),
+      }
+      const res = await bundleApi.updateBundle(bundle.bundleSaleId, request)
+      setBundle(res)
+      setEditing(false)
+      router.refresh()
+    } catch (err) {
+      setError(errorMessage(err))
+    } finally {
+      setBusy(false)
+    }
+  }
+
+  async function postBundle() {
+    if (!bundle) return
+    setBusy(true)
+    setError(null)
+    try {
+      const check = await bundleApi.checkBundlePosting(bundle.bundleSaleId)
+      if (!check.canPost) {
+        setError("Resolve stock shortages before posting this bundle.")
+        return
+      }
+      const updated = await bundleApi.postBundle(bundle.bundleSaleId)
+      setBundle({ ...bundle, ...updated })
+    } catch (err) {
+      setError(errorMessage(err))
+    } finally {
+      setBusy(false)
+    }
+  }
+
+  async function cancelBundle() {
+    if (!bundle) return
+    setBusy(true)
+    setError(null)
+    try {
+      const updated = await bundleApi.cancelBundle(bundle.bundleSaleId)
+      setBundle({ ...bundle, ...updated })
+    } catch (err) {
+      setError(errorMessage(err))
+    } finally {
+      setBusy(false)
+    }
+  }
+
+  if (error && !bundle) return <div className="rounded-lg border border-destructive/30 bg-destructive/5 p-5 text-base text-destructive">{error}</div>
+  if (!bundle) return <div className="rounded-2xl border border-dashed p-8 text-muted-foreground">Loading bundle sale...</div>
+
+  const printHref = `/print/sales/bundles/${bundle.bundleSaleId}`
+
+  return (
+    <div className="flex flex-col gap-6">
+      <div className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
+        <div className="flex items-center gap-3">
+          <Link href="/dashboard/sales/bundles" className={cn(buttonVariants({ variant: "outline", size: "icon" }))}>
+            <ArrowLeft className="size-4" />
+          </Link>
+          <div>
+            <h1 className="text-2xl font-bold text-foreground">{bundle.bundleNo}</h1>
+            <p className="text-base text-muted-foreground">{bundle.bundleName}</p>
+          </div>
+        </div>
+        <div className="flex flex-wrap gap-2">
+          <Link href={printHref} target="_blank" rel="noopener noreferrer" className={cn(buttonVariants({ variant: "outline", size: "lg" }))}>
+            <Printer className="size-4" />
+            Print
+          </Link>
+          {canEdit ? (
+            editing ? (
+              <Button variant="outline" size="lg" onClick={saveBundle} disabled={busy}>
+                <Save className="size-4" />
+                Save
+              </Button>
+            ) : (
+              <Button variant="outline" size="lg" onClick={() => setEditing(true)} disabled={!isDraft}>
+                <Edit className="size-4" />
+                Edit
+              </Button>
+            )
+          ) : null}
+          {isDraft ? (
+            <>
+              <Button variant="outline" size="lg" onClick={postBundle} disabled={busy}>
+                <CheckCircle2 className="size-4" />
+                Post
+              </Button>
+              <Button variant="outline" size="lg" onClick={cancelBundle} disabled={busy}>
+                <XCircle className="size-4" />
+                Cancel
+              </Button>
+            </>
+          ) : null}
+        </div>
+      </div>
+
+      {error ? <div className="rounded-lg border border-destructive/30 bg-destructive/5 p-5 text-base text-destructive">{error}</div> : null}
+
+      <section className="rounded-2xl border bg-card p-4 shadow-sm">
+        <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-3">
+          <div className="space-y-1.5">
+            <Label>Customer</Label>
+            <Select value={customerId ? String(customerId) : "all"} onValueChange={(v) => setCustomerId(v === "all" ? null : Number(v))} disabled={!editing || !isDraft}>
+              <SelectTrigger><SelectValue placeholder="Customer" /></SelectTrigger>
+              <SelectContent>{customers.map((c) => <SelectItem key={c.customerId} value={String(c.customerId)}>{c.customerCode} - {c.displayName ?? c.name}</SelectItem>)}</SelectContent>
+            </Select>
+          </div>
+          <div className="space-y-1.5">
+            <Label>Warehouse</Label>
+            <Select value={warehouseId ? String(warehouseId) : "all"} onValueChange={(v) => setWarehouseId(v === "all" ? null : Number(v))} disabled={!editing || !isDraft}>
+              <SelectTrigger><SelectValue placeholder="Warehouse" /></SelectTrigger>
+              <SelectContent>{warehouses.map((w) => <SelectItem key={w.warehouseId} value={String(w.warehouseId)}>{w.code} - {w.name}</SelectItem>)}</SelectContent>
+            </Select>
+          </div>
+          <div className="space-y-1.5">
+            <Label>Cashier</Label>
+            <Select value={cashierUserId ? String(cashierUserId) : "all"} onValueChange={(v) => setCashierUserId(v === "all" ? null : Number(v))} disabled={!editing || !isDraft}>
+              <SelectTrigger><SelectValue placeholder="Cashier" /></SelectTrigger>
+              <SelectContent>{users.map((u) => <SelectItem key={u.userId} value={String(u.userId)}>{u.displayName}</SelectItem>)}</SelectContent>
+            </Select>
+          </div>
+          <div className="space-y-1.5">
+            <Label>Template</Label>
+            <Select value={templateId ? String(templateId) : "all"} onValueChange={(v) => setTemplateId(v === "all" ? null : Number(v))} disabled={!editing || !isDraft}>
+              <SelectTrigger><SelectValue placeholder={templateLabel} /></SelectTrigger>
+              <SelectContent>{templates.map((t) => <SelectItem key={t.bundleSaleTemplateId} value={String(t.bundleSaleTemplateId)}>{t.templateCode} - {t.templateName}</SelectItem>)}</SelectContent>
+            </Select>
+          </div>
+          <div className="space-y-1.5">
+            <Label>Bundle name</Label>
+            <Input value={bundleName} onChange={(e) => setBundleName(e.target.value)} disabled={!editing || !isDraft} />
+          </div>
+          <div className="space-y-1.5">
+            <Label>Bundle price</Label>
+            <Input type="number" min="0" step="0.01" value={bundlePrice} onChange={(e) => setBundlePrice(Number(e.target.value))} disabled={!editing || !isDraft} />
+          </div>
+        </div>
+      </section>
+
+      <section className="rounded-2xl border bg-card shadow-sm">
+        <div className="flex items-center justify-between border-b px-4 py-3">
+          <div>
+            <h2 className="text-sm font-semibold">Component breakdown</h2>
+            <p className="text-xs text-muted-foreground">{editing ? "Edit the component lines and save." : "Read-only until you enter edit mode."}</p>
+          </div>
+          {editing && isDraft ? <Button type="button" variant="outline" size="sm" onClick={addLine}><Plus className="size-4" /> Add line</Button> : <Badge variant="outline" className={statusClass(bundle.status)}>{bundle.status}</Badge>}
+        </div>
+        <div className="overflow-x-auto">
+          <Table>
+            <TableHeader>
+                <TableRow>
+                  <TableHead>Item</TableHead>
+                  <TableHead>UOM</TableHead>
+                  <TableHead className="text-right">Qty</TableHead>
+                  <TableHead className="text-right">Unit price</TableHead>
+                  <TableHead className="text-right">Include</TableHead>
+                  {editing && isDraft ? <TableHead /> : null}
+                </TableRow>
+              </TableHeader>
+              <TableBody>
+                {lines.map((line) => (
+                  <TableRow key={line.key}>
+                    <TableCell className="min-w-72">
+                      <Select value={line.itemId ? String(line.itemId) : "all"} onValueChange={(v) => {
+                        const itemId = Number(v)
+                        const item = items.find((candidate) => candidate.itemId === itemId)
+                        updateLine(line.key, { itemId, unitPrice: item?.salePrice ?? line.unitPrice })
+                      }} disabled={!editing || !isDraft}>
+                        <SelectTrigger className="h-9 text-sm">
+                          <SelectValue placeholder="Select item" />
+                        </SelectTrigger>
+                        <SelectContent>
+                          {items.map((item) => (
+                            <SelectItem key={item.itemId} value={String(item.itemId)}>
+                              {item.sku} - {item.name}
+                            </SelectItem>
+                          ))}
+                        </SelectContent>
+                      </Select>
+                    </TableCell>
+                    <TableCell className="min-w-40">
+                      <Select value={line.uomId ? String(line.uomId) : "all"} onValueChange={(v) => updateLine(line.key, { uomId: v === "all" ? 0 : Number(v) })} disabled={!editing || !isDraft}>
+                        <SelectTrigger className="h-9 text-sm">
+                          <SelectValue placeholder="Select UOM" />
+                        </SelectTrigger>
+                        <SelectContent>
+                          {uoms.map((uom) => (
+                            <SelectItem key={uom.uomId} value={String(uom.uomId)}>
+                              {uom.name}
+                            </SelectItem>
+                          ))}
+                        </SelectContent>
+                      </Select>
+                    </TableCell>
+                    <TableCell className="text-right w-28"><Input type="number" min="0" step="0.01" value={line.qty} onChange={(e) => updateLine(line.key, { qty: Number(e.target.value) })} disabled={!editing || !isDraft} className="text-right" /></TableCell>
+                    <TableCell className="text-right w-32"><Input type="number" min="0" step="0.01" value={line.unitPrice} onChange={(e) => updateLine(line.key, { unitPrice: Number(e.target.value) })} disabled={!editing || !isDraft} className="text-right" /></TableCell>
+                    <TableCell className="text-right">{line.includeInBundle ? "Yes" : "No"}</TableCell>
+                    {editing && isDraft ? <TableCell className="text-right"><Button type="button" variant="ghost" size="icon-sm" onClick={() => removeLine(line.key)} disabled={lines.length === 1}><Minus className="size-4" /></Button></TableCell> : null}
+                  </TableRow>
+                ))}
+            </TableBody>
+          </Table>
+        </div>
+      </section>
+
+      <section className="rounded-2xl border bg-card p-4 shadow-sm">
+        <div className="grid gap-3 md:grid-cols-3">
+          <div><div className="text-xs text-muted-foreground">Component subtotal</div><div className="text-lg font-semibold">{componentSubtotal.toFixed(2)}</div></div>
+          <div><div className="text-xs text-muted-foreground">Bundle price</div><div className="text-lg font-semibold">{bundlePrice.toFixed(2)}</div></div>
+          <div><div className="text-xs text-muted-foreground">Margin</div><div className="text-lg font-semibold">{(bundlePrice - componentSubtotal).toFixed(2)}</div></div>
+        </div>
+      </section>
+    </div>
+  )
+}

Frontend/erp-system/app/dashboard/sales/bundles/new/page.tsx

@@ -0,0 +1,297 @@
+"use client"
+
+import { Suspense, useEffect, useMemo, useState } from "react"
+import { useRouter, useSearchParams } from "next/navigation"
+import Link from "next/link"
+import { ArrowLeft, Minus, Plus, Save } from "lucide-react"
+
+import { bundleApi } from "@/lib/api/bundles"
+import { customersApi } from "@/lib/api/customers"
+import { itemsApi } from "@/lib/api/items"
+import { uomsApi } from "@/lib/api/uoms"
+import { warehousesApi } from "@/lib/api/warehouses"
+import { usersApi } from "@/lib/api/users"
+import { errorMessage } from "@/lib/error-map"
+import { Button, buttonVariants } from "@/components/ui/button"
+import { Input } from "@/components/ui/input"
+import { Label } from "@/components/ui/label"
+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 { cn } from "@/lib/utils"
+import { toast } from "@/components/ui/toast"
+import { Customer } from "@/types/customers"
+import { ItemListItem, Uom, Warehouse } from "@/types/master-data"
+import { ManagedUser } from "@/types/users"
+import { BundleSaleTemplate, BundleSaleTemplateLine, BundleSaleTemplateSummary, CreateBundleSaleRequest } from "@/types/bundles"
+
+type EditableLine = BundleSaleTemplateLine & { key: string }
+
+const blankLine = (source: BundleSaleTemplateLine): EditableLine => ({ ...source, key: crypto.randomUUID() })
+
+function NewBundleSaleContent() {
+  const router = useRouter()
+  const searchParams = useSearchParams()
+  const templateFromQuery = searchParams.get("templateId")
+  const [customers, setCustomers] = useState<Customer[]>([])
+  const [items, setItems] = useState<ItemListItem[]>([])
+  const [uoms, setUoms] = useState<Uom[]>([])
+  const [warehouses, setWarehouses] = useState<Warehouse[]>([])
+  const [users, setUsers] = useState<ManagedUser[]>([])
+  const [templates, setTemplates] = useState<BundleSaleTemplateSummary[]>([])
+  const [template, setTemplate] = useState<BundleSaleTemplate | null>(null)
+  const [customerId, setCustomerId] = useState<number | null>(null)
+  const [warehouseId, setWarehouseId] = useState<number | null>(null)
+  const [cashierUserId, setCashierUserId] = useState<number | null>(null)
+  const [templateId, setTemplateId] = useState<number | null>(templateFromQuery ? Number(templateFromQuery) : null)
+  const [bundleName, setBundleName] = useState("Demo Bundle")
+  const [bundlePrice, setBundlePrice] = useState<number>(0)
+  const [allowPriceOverride, setAllowPriceOverride] = useState(false)
+  const [lines, setLines] = useState<EditableLine[]>([])
+  const [loading, setLoading] = useState(true)
+  const [saving, setSaving] = useState(false)
+  const [submitError, setSubmitError] = useState<string | null>(null)
+
+  useEffect(() => {
+    Promise.all([
+      customersApi.list({ pageSize: 200 }),
+      itemsApi.list({ pageSize: 200 }),
+      uomsApi.list({ pageSize: 200 }),
+      warehousesApi.list({ pageSize: 200 }),
+      usersApi.list({ pageSize: 200 }),
+      bundleApi.listTemplates({ pageSize: 200 }),
+    ])
+      .then(([cust, itemRes, uomRes, whRes, userRes, templateRes]) => {
+        setCustomers(cust.items)
+        setItems(itemRes.items)
+        setUoms(uomRes.items)
+        setWarehouses(whRes.items)
+        setUsers(userRes.items)
+        setTemplates(templateRes.items)
+        setCustomerId(cust.items[0]?.customerId ?? null)
+        setWarehouseId(whRes.items[0]?.warehouseId ?? null)
+        setCashierUserId(userRes.items[0]?.userId ?? null)
+        setTemplateId((current) => current ?? templateRes.items[0]?.bundleSaleTemplateId ?? null)
+      })
+      .catch((err) => setSubmitError(errorMessage(err)))
+      .finally(() => setLoading(false))
+  }, [])
+
+  useEffect(() => {
+    if (!templateId) return
+    bundleApi.getTemplate(templateId).then((res) => {
+      setTemplate(res)
+      setLines(res.lines.map(blankLine))
+      setBundlePrice(res.lines.reduce((sum, line) => sum + line.qty * line.unitPrice, 0))
+    }).catch((err) => setSubmitError(errorMessage(err)))
+  }, [templateId])
+
+  const templateLabel = useMemo(() => template?.templateName ?? "Select template", [template])
+  const componentSubtotal = useMemo(() => lines.reduce((sum, line) => sum + Number(line.qty || 0) * Number(line.unitPrice || 0), 0), [lines])
+
+  function updateLine(key: string, patch: Partial<EditableLine>) {
+    setLines((prev) => prev.map((line) => (line.key === key ? { ...line, ...patch } : line)))
+  }
+
+  function addLine() {
+    const source = lines[lines.length - 1] ?? template?.lines[0]
+    if (!source) return
+    setLines((prev) => [...prev, blankLine(source)])
+  }
+
+  function removeLine(key: string) {
+    setLines((prev) => (prev.length === 1 ? prev : prev.filter((line) => line.key !== key)))
+  }
+
+  async function submit() {
+    if (!customerId || !warehouseId || !cashierUserId || !templateId || !template) {
+      setSubmitError("Select customer, warehouse, cashier, and bundle template.")
+      return
+    }
+    if (lines.length === 0) {
+      setSubmitError("Add at least one bundle component line.")
+      return
+    }
+    setSaving(true)
+    setSubmitError(null)
+    try {
+      const request: CreateBundleSaleRequest = {
+        customerId,
+        warehouseId,
+        cashierUserId,
+        bundleSaleTemplateId: templateId,
+        bundleName,
+        bundlePrice,
+        allowPriceOverride,
+        lines: lines.map(({ key, ...line }) => line),
+      }
+      const res = await bundleApi.createBundle(request)
+      toast.success("Bundle saved", res.bundleNo)
+      router.push(`/dashboard/sales/bundles/${res.bundleSaleId}`)
+    } catch (err) {
+      setSubmitError(errorMessage(err))
+    } finally {
+      setSaving(false)
+    }
+  }
+
+  if (loading) return <div className="rounded-2xl border border-dashed p-8 text-muted-foreground">Loading masters...</div>
+
+  return (
+    <div className="flex flex-col gap-6">
+      <div className="flex items-center gap-3">
+        <Link href="/dashboard/sales/bundles" className={cn(buttonVariants({ variant: "outline", size: "icon" }))}>
+          <ArrowLeft className="size-4" />
+        </Link>
+        <div>
+          <h1 className="text-2xl font-bold text-foreground">Create bundle sale</h1>
+          <p className="text-base text-muted-foreground">Create a fixed bundle from a stored template.</p>
+        </div>
+      </div>
+
+      {submitError ? <div className="rounded-lg border border-destructive/30 bg-destructive/5 p-5 text-base text-destructive">{submitError}</div> : null}
+
+      <section className="rounded-2xl border bg-card p-4 shadow-sm">
+        <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-3">
+          <div className="space-y-1.5">
+            <Label>Customer</Label>
+            <Select value={customerId ? String(customerId) : "all"} onValueChange={(v) => setCustomerId(v === "all" ? null : Number(v))}>
+              <SelectTrigger><SelectValue placeholder="Select customer" /></SelectTrigger>
+              <SelectContent>{customers.map((c) => <SelectItem key={c.customerId} value={String(c.customerId)}>{c.customerCode} - {c.displayName ?? c.name}</SelectItem>)}</SelectContent>
+            </Select>
+          </div>
+          <div className="space-y-1.5">
+            <Label>Warehouse</Label>
+            <Select value={warehouseId ? String(warehouseId) : "all"} onValueChange={(v) => setWarehouseId(v === "all" ? null : Number(v))}>
+              <SelectTrigger><SelectValue placeholder="Select warehouse" /></SelectTrigger>
+              <SelectContent>{warehouses.map((w) => <SelectItem key={w.warehouseId} value={String(w.warehouseId)}>{w.code} - {w.name}</SelectItem>)}</SelectContent>
+            </Select>
+          </div>
+          <div className="space-y-1.5">
+            <Label>Cashier</Label>
+            <Select value={cashierUserId ? String(cashierUserId) : "all"} onValueChange={(v) => setCashierUserId(v === "all" ? null : Number(v))}>
+              <SelectTrigger><SelectValue placeholder="Select cashier" /></SelectTrigger>
+              <SelectContent>{users.map((u) => <SelectItem key={u.userId} value={String(u.userId)}>{u.displayName}</SelectItem>)}</SelectContent>
+            </Select>
+          </div>
+          <div className="space-y-1.5">
+            <Label>Template</Label>
+            <Select value={templateId ? String(templateId) : "all"} onValueChange={(v) => setTemplateId(v === "all" ? null : Number(v))}>
+              <SelectTrigger><SelectValue placeholder={templateLabel} /></SelectTrigger>
+              <SelectContent>{templates.map((t) => <SelectItem key={t.bundleSaleTemplateId} value={String(t.bundleSaleTemplateId)}>{t.templateCode} - {t.templateName}</SelectItem>)}</SelectContent>
+            </Select>
+          </div>
+          <div className="space-y-1.5">
+            <Label>Bundle name</Label>
+            <Input value={bundleName} onChange={(e) => setBundleName(e.target.value)} />
+          </div>
+          <div className="space-y-1.5">
+            <Label>Bundle price</Label>
+            <Input type="number" min="0" step="0.01" value={bundlePrice} onChange={(e) => setBundlePrice(Number(e.target.value))} />
+          </div>
+          <div className="space-y-1.5">
+            <Label>Override allowed</Label>
+            <button type="button" onClick={() => setAllowPriceOverride((v) => !v)} className={cn("flex h-10 w-full items-center justify-center rounded-md border px-3 text-sm font-medium", allowPriceOverride ? "border-emerald-200 bg-emerald-50 text-emerald-800" : "border-border text-muted-foreground")}>
+              {allowPriceOverride ? "Yes" : "No"}
+            </button>
+          </div>
+        </div>
+      </section>
+
+      <section className="rounded-2xl border bg-card shadow-sm">
+        <div className="flex items-center justify-between border-b px-4 py-3">
+          <div>
+            <h2 className="text-sm font-semibold">Editable component rows</h2>
+            <p className="text-xs text-muted-foreground">These rows are sent to the backend and stored with the bundle.</p>
+          </div>
+          <Button type="button" variant="outline" size="sm" onClick={addLine}><Plus className="size-4" /> Add component</Button>
+        </div>
+        <div className="overflow-x-auto">
+            <Table>
+            <TableHeader>
+              <TableRow>
+                <TableHead>Item</TableHead>
+                <TableHead>UOM</TableHead>
+                <TableHead className="text-right">Qty</TableHead>
+                <TableHead className="text-right">Unit price</TableHead>
+                <TableHead className="text-right">Include</TableHead>
+                <TableHead />
+              </TableRow>
+            </TableHeader>
+            <TableBody>
+              {lines.map((line) => (
+                <TableRow key={line.key}>
+                  <TableCell className="min-w-72">
+                      <Select value={line.itemId ? String(line.itemId) : "all"} onValueChange={(v) => {
+                        const itemId = Number(v)
+                      const item = items.find((candidate) => candidate.itemId === itemId)
+                      updateLine(line.key, {
+                        itemId,
+                        unitPrice: item?.salePrice ?? line.unitPrice,
+                      })
+                    }}>
+                      <SelectTrigger className="h-9 text-sm">
+                        <SelectValue placeholder="Select item" />
+                      </SelectTrigger>
+                      <SelectContent>
+                        {items.map((item) => (
+                          <SelectItem key={item.itemId} value={String(item.itemId)}>
+                            {item.sku} - {item.name}
+                          </SelectItem>
+                        ))}
+                      </SelectContent>
+                    </Select>
+                  </TableCell>
+                  <TableCell className="min-w-40">
+                      <Select value={line.uomId ? String(line.uomId) : "all"} onValueChange={(v) => updateLine(line.key, { uomId: v === "all" ? 0 : Number(v) })}>
+                      <SelectTrigger className="h-9 text-sm">
+                        <SelectValue placeholder="Select UOM" />
+                      </SelectTrigger>
+                      <SelectContent>
+                        {uoms.map((uom) => (
+                          <SelectItem key={uom.uomId} value={String(uom.uomId)}>
+                            {uom.name}
+                          </SelectItem>
+                        ))}
+                      </SelectContent>
+                    </Select>
+                  </TableCell>
+                  <TableCell className="text-right w-28"><Input type="number" min="0" step="0.01" value={line.qty} onChange={(e) => updateLine(line.key, { qty: Number(e.target.value) })} className="text-right" /></TableCell>
+                  <TableCell className="text-right w-32"><Input type="number" min="0" step="0.01" value={line.unitPrice} onChange={(e) => updateLine(line.key, { unitPrice: Number(e.target.value) })} className="text-right" /></TableCell>
+                  <TableCell className="text-right">{line.includeInBundle ? "Yes" : "No"}</TableCell>
+                  <TableCell className="text-right">
+                    <Button type="button" variant="ghost" size="icon-sm" onClick={() => removeLine(line.key)} disabled={lines.length === 1}><Minus className="size-4" /></Button>
+                  </TableCell>
+                </TableRow>
+              ))}
+            </TableBody>
+          </Table>
+        </div>
+      </section>
+
+      <section className="rounded-2xl border bg-card p-4 shadow-sm">
+        <div className="grid gap-3 md:grid-cols-3">
+          <div><div className="text-xs text-muted-foreground">Component subtotal</div><div className="text-lg font-semibold">{componentSubtotal.toFixed(2)}</div></div>
+          <div><div className="text-xs text-muted-foreground">Bundle price</div><div className="text-lg font-semibold">{bundlePrice.toFixed(2)}</div></div>
+          <div><div className="text-xs text-muted-foreground">Margin</div><div className="text-lg font-semibold">{(bundlePrice - componentSubtotal).toFixed(2)}</div></div>
+        </div>
+      </section>
+
+      <div className="flex justify-end gap-3">
+        <Link href="/dashboard/sales/bundles" className={cn(buttonVariants({ variant: "outline", size: "lg" }))}>Cancel</Link>
+        <Button size="lg" onClick={submit} disabled={saving}>
+          <Save className="size-4" />
+          {saving ? "Saving..." : "Save draft"}
+        </Button>
+      </div>
+    </div>
+  )
+}
+
+export default function NewBundleSalePage() {
+  return (
+    <Suspense fallback={<Skeleton className="h-48 w-full" />}>
+      <NewBundleSaleContent />
+    </Suspense>
+  )
+}

Frontend/erp-system/app/dashboard/sales/bundles/page.tsx

@@ -0,0 +1,292 @@
+"use client"
+
+import { useEffect, useMemo, useState } from "react"
+import Link from "next/link"
+import { ChevronLeft, ChevronRight, Eye, Filter, FileText, Plus, Printer } from "lucide-react"
+
+import { bundleApi } from "@/lib/api/bundles"
+import { customersApi } from "@/lib/api/customers"
+import { warehousesApi } from "@/lib/api/warehouses"
+import { errorMessage } from "@/lib/error-map"
+import { Button, buttonVariants } from "@/components/ui/button"
+import { Badge } from "@/components/ui/badge"
+import { Input } from "@/components/ui/input"
+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 { PaginationMeta } from "@/types/common"
+import { Customer } from "@/types/customers"
+import { Warehouse } from "@/types/master-data"
+import { BundleSaleStatus, BundleSaleSummary } from "@/types/bundles"
+import { cn } from "@/lib/utils"
+
+type StatusFilter = BundleSaleStatus | "All"
+
+const PAGE_SIZE = 10
+const tabs = ["All", "Draft", "Posted", "Cancelled"] as const
+
+function statusClass(status: BundleSaleStatus) {
+  switch (status) {
+    case "Draft":
+      return "border-amber-200 bg-amber-50 text-amber-800"
+    case "Posted":
+      return "border-emerald-200 bg-emerald-50 text-emerald-800"
+    case "Cancelled":
+      return "border-rose-200 bg-rose-50 text-rose-800"
+  }
+}
+
+export default function BundleSalesPage() {
+  const [rows, setRows] = useState<BundleSaleSummary[] | null>(null)
+  const [pagination, setPagination] = useState<PaginationMeta | null>(null)
+  const [error, setError] = useState<string | null>(null)
+  const [status, setStatus] = useState<StatusFilter>("All")
+  const [customerId, setCustomerId] = useState<number | null>(null)
+  const [warehouseId, setWarehouseId] = useState<number | null>(null)
+  const [searchInput, setSearchInput] = useState("")
+  const [query, setQuery] = useState("")
+  const [page, setPage] = useState(1)
+  const [showFilters, setShowFilters] = useState(false)
+  const [customers, setCustomers] = useState<Customer[]>([])
+  const [warehouses, setWarehouses] = useState<Warehouse[]>([])
+
+  useEffect(() => {
+    const timeout = setTimeout(() => setQuery(searchInput.trim()), 300)
+    return () => clearTimeout(timeout)
+  }, [searchInput])
+
+  useEffect(() => setPage(1), [query, status, customerId, warehouseId])
+
+  useEffect(() => {
+    Promise.all([customersApi.list({ pageSize: 200 }), warehousesApi.list({ pageSize: 200 })])
+      .then(([cust, whRes]) => {
+        setCustomers(cust.items)
+        setWarehouses(whRes.items)
+      })
+      .catch((err) => setError(errorMessage(err)))
+  }, [])
+
+  useEffect(() => {
+    setError(null)
+    bundleApi
+      .listBundles({
+        page,
+        pageSize: PAGE_SIZE,
+        status: status === "All" ? undefined : status,
+        q: query || undefined,
+        customerId: customerId ?? undefined,
+        warehouseId: warehouseId ?? undefined,
+      })
+      .then((res) => {
+        setRows(res.items)
+        setPagination(res.pagination)
+      })
+      .catch((err) => setError(errorMessage(err)))
+  }, [page, status, query, customerId, warehouseId])
+
+  const visibleRows = useMemo(() => rows ?? [], [rows])
+  const hasFilters = status !== "All" || query.length > 0 || customerId !== null || warehouseId !== null
+  const bundleTotal = visibleRows.reduce((sum, row) => sum + row.grandTotal, 0)
+  const printHref = `/print/sales/bundles?status=${encodeURIComponent(status)}&q=${encodeURIComponent(query)}&customerId=${customerId ?? ""}&warehouseId=${warehouseId ?? ""}`
+
+  return (
+    <div className="flex flex-col gap-6">
+      <div className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
+        <div>
+          <h1 className="text-2xl font-bold text-foreground">Bundle Sales</h1>
+          <p className="text-base text-muted-foreground">Fixed bundle register with draft, posted, and cancelled states.</p>
+        </div>
+        <div className="flex flex-wrap gap-2">
+          <Link href={printHref} target="_blank" rel="noopener noreferrer" className={cn(buttonVariants({ variant: "outline", size: "lg" }))}>
+            <Printer className="size-5" />
+            Print batch
+          </Link>
+          <Link href="/dashboard/sales/bundles/new" className={cn(buttonVariants({ size: "lg" }))}>
+            <Plus className="size-5" />
+            New Bundle
+          </Link>
+        </div>
+      </div>
+
+      <div className="rounded-2xl border bg-card shadow-sm">
+        <div className="flex flex-col gap-3 border-b px-4 py-4 lg:flex-row lg:items-center">
+          <div className="flex flex-wrap gap-2">
+            {tabs.map((t) => (
+              <button
+                key={t}
+                onClick={() => setStatus(t)}
+                className={cn(
+                  "rounded-full border px-3 py-1.5 text-xs font-medium transition-colors",
+                  status === t ? "border-primary bg-primary text-primary-foreground" : "border-border text-muted-foreground hover:text-foreground"
+                )}
+              >
+                {t}
+              </button>
+            ))}
+          </div>
+          <div className="flex flex-1 flex-col gap-3 lg:flex-row lg:items-center lg:justify-end">
+            <Input value={searchInput} onChange={(e) => setSearchInput(e.target.value)} placeholder="Filter by bundle, code, or customer" className="h-12 w-full lg:max-w-sm" />
+            <Button variant="outline" size="sm" className="lg:ml-auto" onClick={() => setShowFilters((v) => !v)}>
+              <Filter className="size-4" />
+              Advanced
+            </Button>
+          </div>
+        </div>
+
+        {showFilters && (
+          <div className="grid gap-4 border-b px-4 py-4 md:grid-cols-3">
+            <div className="space-y-1.5">
+              <div className="text-xs font-medium text-muted-foreground">Customer</div>
+              <Select value={customerId ? String(customerId) : "all"} onValueChange={(v) => setCustomerId(v === "all" ? null : Number(v))}>
+                <SelectTrigger className="h-10">
+                  <SelectValue placeholder="All customers" />
+                </SelectTrigger>
+                <SelectContent>
+                  <SelectItem value="all">All customers</SelectItem>
+                  {customers.map((c) => (
+                    <SelectItem key={c.customerId} value={String(c.customerId)}>
+                      {c.customerCode} - {c.displayName ?? c.name}
+                    </SelectItem>
+                  ))}
+                </SelectContent>
+              </Select>
+            </div>
+            <div className="space-y-1.5">
+              <div className="text-xs font-medium text-muted-foreground">Warehouse</div>
+              <Select value={warehouseId ? String(warehouseId) : "all"} onValueChange={(v) => setWarehouseId(v === "all" ? null : Number(v))}>
+                <SelectTrigger className="h-10">
+                  <SelectValue placeholder="All warehouses" />
+                </SelectTrigger>
+                <SelectContent>
+                  <SelectItem value="all">All warehouses</SelectItem>
+                  {warehouses.map((w) => (
+                    <SelectItem key={w.warehouseId} value={String(w.warehouseId)}>
+                      {w.code} - {w.name}
+                    </SelectItem>
+                  ))}
+                </SelectContent>
+              </Select>
+            </div>
+            <div className="flex items-end gap-2">
+              <Button
+                type="button"
+                variant="outline"
+                className="flex-1"
+                onClick={() => {
+                  setCustomerId(null)
+                  setWarehouseId(null)
+                  setStatus("All")
+                  setSearchInput("")
+                  setQuery("")
+                }}
+              >
+                Reset
+              </Button>
+            </div>
+          </div>
+        )}
+
+        {error && <div className="mx-4 mt-4 rounded-lg border border-destructive/30 bg-destructive/5 p-5 text-base text-destructive">{error}</div>}
+
+        {!error && rows === null && (
+          <div className="flex flex-col gap-3 px-4 py-4">
+            {Array.from({ length: 5 }).map((_, i) => (
+              <Skeleton key={i} className="h-14 w-full" />
+            ))}
+          </div>
+        )}
+
+        {!error && rows !== null && visibleRows.length === 0 && (
+          <div className="flex flex-col items-center gap-4 px-4 py-20 text-center">
+            <FileText className="size-12 text-muted-foreground" />
+            <p className="text-base text-muted-foreground">{hasFilters ? "No bundle sales match your filters." : "No bundle sales yet."}</p>
+          </div>
+        )}
+
+        {!error && rows !== null && visibleRows.length > 0 && (
+          <>
+            <div className="overflow-x-auto">
+              <Table className="text-base">
+                <TableHeader>
+                  <TableRow>
+                    <TableHead className="h-12 px-4 text-sm">Bundle</TableHead>
+                    <TableHead className="h-12 px-4 text-sm">Customer</TableHead>
+                    <TableHead className="h-12 px-4 text-sm">Date</TableHead>
+                    <TableHead className="h-12 px-4 text-sm text-right">Price</TableHead>
+                    <TableHead className="h-12 px-4 text-sm text-right">Grand</TableHead>
+                    <TableHead className="h-12 px-4 text-sm">Status</TableHead>
+                    <TableHead className="h-12 px-4 text-sm text-right">View</TableHead>
+                  </TableRow>
+                </TableHeader>
+                <TableBody>
+                  {visibleRows.map((row) => (
+                    <TableRow key={row.bundleSaleId} className="hover:bg-muted/40">
+                      <TableCell className="px-4 py-3.5 font-medium">
+                        <Link href={`/dashboard/sales/bundles/${row.bundleSaleId}`} className="hover:underline">
+                          {row.bundleNo}
+                        </Link>
+                      </TableCell>
+                      <TableCell className="px-4 py-3.5">{row.customerSnapshotName}</TableCell>
+                      <TableCell className="px-4 py-3.5 text-muted-foreground">{new Date(row.createdAt).toLocaleDateString()}</TableCell>
+                      <TableCell className="px-4 py-3.5 text-right font-mono tabular-nums">{row.bundlePrice.toFixed(2)}</TableCell>
+                      <TableCell className="px-4 py-3.5 text-right font-mono font-semibold tabular-nums">{row.grandTotal.toFixed(2)}</TableCell>
+                      <TableCell className="px-4 py-3.5">
+                        <Badge variant="outline" className={statusClass(row.status)}>
+                          {row.status}
+                        </Badge>
+                      </TableCell>
+                      <TableCell className="px-4 py-3.5 text-right">
+                        <div className="inline-flex gap-2">
+                          <Link href={`/dashboard/sales/bundles/${row.bundleSaleId}`} className={cn(buttonVariants({ variant: "ghost", size: "icon-sm" }))} aria-label={`View bundle ${row.bundleNo}`}>
+                            <Eye className="size-4" />
+                          </Link>
+                          <Link href={`/print/sales/bundles/${row.bundleSaleId}`} target="_blank" rel="noopener noreferrer" className={cn(buttonVariants({ variant: "ghost", size: "icon-sm" }))} aria-label={`Print bundle ${row.bundleNo}`}>
+                            <Printer className="size-4" />
+                          </Link>
+                        </div>
+                      </TableCell>
+                    </TableRow>
+                  ))}
+                </TableBody>
+              </Table>
+            </div>
+
+            <div className="border-t px-4 py-3">
+              <div className="grid gap-3 text-sm md:grid-cols-2">
+                <div className="rounded-lg border bg-muted/20 px-3 py-2">
+                  <div className="text-muted-foreground">Rows loaded</div>
+                  <div className="font-mono text-base font-semibold tabular-nums">{visibleRows.length}</div>
+                </div>
+                <div className="rounded-lg border bg-muted/20 px-3 py-2">
+                  <div className="text-muted-foreground">Grand total</div>
+                  <div className="font-mono text-base font-semibold tabular-nums">{bundleTotal.toFixed(2)}</div>
+                </div>
+              </div>
+            </div>
+
+            {pagination && pagination.totalPages > 1 && (
+              <div className="flex flex-col gap-3 border-t px-4 py-4 sm:flex-row sm:items-center sm: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))}>
+                    <ChevronLeft />
+                    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
+                    <ChevronRight />
+                  </Button>
+                </div>
+              </div>
+            )}
+          </>
+        )}
+      </div>
+    </div>
+  )
+}

Frontend/erp-system/app/dashboard/sales/bundles/register/page.tsx

@@ -0,0 +1,5 @@
+import { redirect } from "next/navigation"
+
+export default function BundleRegisterPage() {
+  redirect("/dashboard/sales/bundles")
+}

Frontend/erp-system/app/dashboard/sales/bundles/reports/page.tsx

@@ -0,0 +1,27 @@
+"use client"
+
+import Link from "next/link"
+import { ArrowLeft, FileText } from "lucide-react"
+
+import { buttonVariants } from "@/components/ui/button"
+import { cn } from "@/lib/utils"
+
+export default function BundleReportsPage() {
+  return (
+    <div className="flex flex-col gap-6">
+      <div className="flex items-center gap-3">
+        <Link href="/dashboard/sales/bundles" className={cn(buttonVariants({ variant: "outline", size: "icon" }))}>
+          <ArrowLeft className="size-4" />
+        </Link>
+        <div>
+          <h1 className="text-2xl font-bold text-foreground">Bundle Reports</h1>
+          <p className="text-base text-muted-foreground">Bundle-level reporting will be added after the backend module is wired.</p>
+        </div>
+      </div>
+      <div className="rounded-2xl border border-dashed p-8 text-muted-foreground">
+        <FileText className="mb-3 size-6" />
+        This screen is a placeholder for bundle sales reporting.
+      </div>
+    </div>
+  )
+}

Frontend/erp-system/app/dashboard/sales/free-issues/new/page.tsx

@@ -0,0 +1,494 @@
+"use client"
+
+import { useEffect, useState } from "react"
+import Link from "next/link"
+import { ArrowLeft, Pencil, Plus, Save, Trash2, X } from "lucide-react"
+
+import { Button, buttonVariants } from "@/components/ui/button"
+import { Input } from "@/components/ui/input"
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select"
+import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from "@/components/ui/table"
+import { cn } from "@/lib/utils"
+import { errorMessage } from "@/lib/error-map"
+import { salesApi } from "@/lib/api/sales"
+import { customersApi } from "@/lib/api/customers"
+import { itemsApi } from "@/lib/api/items"
+import { uomsApi } from "@/lib/api/uoms"
+import { warehousesApi } from "@/lib/api/warehouses"
+import { usersApi } from "@/lib/api/users"
+import { toast } from "@/components/ui/toast"
+import { Customer } from "@/types/customers"
+import { ItemListItem, Uom, Warehouse } from "@/types/master-data"
+import { ManagedUser } from "@/types/users"
+import { CreateSalesSlipLineRequest, CreateSalesSlipRequest } from "@/types/sales"
+
+type Line = CreateSalesSlipLineRequest & { key: string }
+
+type FreeIssueRow = {
+  salesSlipId: number
+  slipNo: string
+  status: string
+  etag: string
+  warehouseName: string
+  itemName: string
+  itemSku: string
+  uomName: string
+  qty: number
+  freeQty: number
+}
+
+const blankLine = (key: string): Line => ({
+  key,
+  itemId: 0,
+  uomId: 0,
+  warehouseId: 0,
+  qty: 1,
+  freeQty: 0,
+  allowManualPriceOverride: true,
+  discountMode: "Percentage",
+  discountPct: 0,
+  discountAmount: 0,
+  discountValue: 0,
+  taxPct: 0,
+  isFreeIssue: false,
+  parentLineId: null,
+})
+
+export default function NewFreeIssuePage() {
+  const [customers, setCustomers] = useState<Customer[]>([])
+  const [items, setItems] = useState<ItemListItem[]>([])
+  const [uoms, setUoms] = useState<Uom[]>([])
+  const [warehouses, setWarehouses] = useState<Warehouse[]>([])
+  const [users, setUsers] = useState<ManagedUser[]>([])
+  const [customerId, setCustomerId] = useState<number | null>(null)
+  const [warehouseId, setWarehouseId] = useState<number | null>(null)
+  const [cashierUserId, setCashierUserId] = useState<number | null>(null)
+  const [lines, setLines] = useState<Line[]>([blankLine("line-1")])
+  const [rows, setRows] = useState<FreeIssueRow[]>([])
+  const [editingRowId, setEditingRowId] = useState<number | null>(null)
+  const [editingLines, setEditingLines] = useState<Line[]>([])
+  const [loading, setLoading] = useState(true)
+  const [saving, setSaving] = useState(false)
+  const [error, setError] = useState<string | null>(null)
+
+  async function refreshRows() {
+    const list = await salesApi.listFreeIssues({ pageSize: 50 })
+    const details = await Promise.all(
+      list.items.map(async (summary) => {
+        const detail = await salesApi.getFreeIssue(summary.salesSlipId)
+        const firstLine = detail.data.lines[0]
+        const item = items.find((x) => x.itemId === firstLine?.itemId)
+        const uom = uoms.find((x) => x.uomId === firstLine?.uomId)
+        const warehouse = warehouses.find((x) => x.warehouseId === detail.data.warehouseId)
+        return {
+          salesSlipId: detail.data.salesSlipId,
+          slipNo: detail.data.slipNo,
+          status: detail.data.status,
+          etag: detail.etag ?? "",
+          warehouseName: warehouse?.name ?? `Warehouse ${detail.data.warehouseId}`,
+          itemName: item?.name ?? firstLine?.description ?? "—",
+          itemSku: item?.sku ?? `SKU-${firstLine?.itemId ?? 0}`,
+          uomName: uom?.name ?? `UOM ${firstLine?.uomId ?? 0}`,
+          qty: firstLine?.qty ?? 0,
+          freeQty: firstLine?.freeQty ?? 0,
+        } satisfies FreeIssueRow
+      }),
+    )
+    setRows(details.filter((row) => row.status !== "Cancelled"))
+  }
+
+  useEffect(() => {
+    Promise.all([
+      customersApi.list({ pageSize: 200 }),
+      itemsApi.list({ pageSize: 200 }),
+      uomsApi.list({ pageSize: 200 }),
+      warehousesApi.list({ pageSize: 200 }),
+      usersApi.list({ pageSize: 200 }),
+    ])
+      .then(async ([cust, itemRes, uomRes, whRes, userRes]) => {
+        setCustomers(cust.items)
+        setItems(itemRes.items)
+        setUoms(uomRes.items)
+        setWarehouses(whRes.items)
+        setUsers(userRes.items)
+        setCustomerId(cust.items[0]?.customerId ?? null)
+        setWarehouseId(whRes.items[0]?.warehouseId ?? null)
+        setCashierUserId(userRes.items[0]?.userId ?? null)
+        setLines([
+          {
+            ...blankLine("line-1"),
+            itemId: itemRes.items[0]?.itemId ?? 0,
+            uomId: itemRes.items[0]?.baseUomId ?? uomRes.items[0]?.uomId ?? 0,
+            warehouseId: whRes.items[0]?.warehouseId ?? 0,
+          },
+        ])
+        await refreshRows()
+      })
+      .catch((err) => setError(errorMessage(err)))
+      .finally(() => setLoading(false))
+  }, [])
+
+  function updateLine(key: string, patch: Partial<Line>) {
+    setLines((prev) => prev.map((line) => (line.key === key ? { ...line, ...patch } : line)))
+  }
+
+  function updateEditingLine(key: string, patch: Partial<Line>) {
+    setEditingLines((prev) => prev.map((line) => (line.key === key ? { ...line, ...patch } : line)))
+  }
+
+  function addLine() {
+    setLines((prev) => [...prev, blankLine(`line-${Date.now()}`)])
+  }
+
+  function removeLine(key: string) {
+    setLines((prev) => (prev.length === 1 ? prev : prev.filter((line) => line.key !== key)))
+  }
+
+  function selectItem(key: string, itemId: number) {
+    const item = items.find((candidate) => candidate.itemId === itemId)
+    updateLine(key, { itemId, uomId: item?.baseUomId ?? 0 })
+  }
+
+  function selectEditingItem(key: string, itemId: number) {
+    const item = items.find((candidate) => candidate.itemId === itemId)
+    updateEditingLine(key, { itemId, uomId: item?.baseUomId ?? 0 })
+  }
+
+  async function submit() {
+    const activeLines = editingRowId ? editingLines : lines
+    if (!customerId || !warehouseId || !cashierUserId) return setError("Select customer, warehouse, and cashier.")
+    if (activeLines.some((line) => !line.itemId)) return setError("Select an item for every line.")
+    if (activeLines.some((line) => !line.uomId)) return setError("Select a valid UOM for every line.")
+    if (activeLines.some((line) => !line.warehouseId)) return setError("Select a warehouse for every line.")
+
+    setSaving(true)
+    setError(null)
+    try {
+      const payload: CreateSalesSlipRequest = {
+        customerId,
+        warehouseId,
+        cashierUserId,
+        lines: activeLines.map((line) => ({
+          itemId: Number(line.itemId),
+          uomId: Number(line.uomId),
+          warehouseId: Number(line.warehouseId),
+          qty: Number(line.qty),
+          freeQty: Number(line.freeQty),
+          unitPrice: line.unitPrice === null ? null : Number(line.unitPrice),
+          allowManualPriceOverride: line.allowManualPriceOverride,
+          discountMode: line.discountMode,
+          discountPct: Number(line.discountPct),
+          discountAmount: Number(line.discountAmount),
+          discountValue: Number(line.discountValue),
+          taxPct: Number(line.taxPct),
+          isFreeIssue: line.isFreeIssue,
+          parentLineId: line.parentLineId ?? null,
+        })),
+      }
+
+      if (editingRowId) {
+        const latest = await salesApi.getFreeIssue(editingRowId)
+        if (!latest.etag) throw new Error("Missing ETag for free issue update.")
+        await salesApi.updateFreeIssue(editingRowId, payload, latest.etag)
+        toast.success("Free issue updated")
+        setEditingRowId(null)
+        setEditingLines([])
+      } else {
+        const created = await salesApi.createFreeIssue(payload)
+        toast.success("Free issue created", created.data.slipNo)
+      }
+
+      setLines([blankLine("line-1")])
+      await refreshRows()
+    } catch (err) {
+      setError(errorMessage(err))
+    } finally {
+      setSaving(false)
+    }
+  }
+
+  async function startEdit(row: FreeIssueRow) {
+    try {
+      const detail = await salesApi.getFreeIssue(row.salesSlipId)
+      const detailLine = detail.data.lines[0]
+      setEditingRowId(row.salesSlipId)
+      setCustomerId(detail.data.customerId)
+      setWarehouseId(detail.data.warehouseId)
+      setCashierUserId(detail.data.cashierUserId)
+      setEditingLines([
+        {
+          key: "edit-line-1",
+          itemId: detailLine?.itemId ?? 0,
+          uomId: detailLine?.uomId ?? 0,
+          warehouseId: detailLine?.warehouseId ?? detail.data.warehouseId,
+          qty: detailLine?.qty ?? 1,
+          freeQty: detailLine?.freeQty ?? 0,
+          unitPrice: detailLine?.unitPrice ?? null,
+          allowManualPriceOverride: true,
+          discountMode: detailLine?.discountMode ?? "Percentage",
+          discountPct: detailLine?.discountPct ?? 0,
+          discountAmount: detailLine?.discountAmount ?? 0,
+          discountValue: 0,
+          taxPct: detailLine?.taxPct ?? 0,
+          isFreeIssue: detailLine?.isFreeIssue ?? false,
+          parentLineId: detailLine?.parentLineId ?? null,
+        },
+      ])
+    } catch (err) {
+      setError(errorMessage(err))
+    }
+  }
+
+  function cancelEdit() {
+    setEditingRowId(null)
+    setEditingLines([])
+  }
+
+  async function deleteRow(row: FreeIssueRow) {
+    if (row.status !== "Draft") return
+    try {
+      await salesApi.cancelFreeIssue(row.salesSlipId)
+      toast.success("Free issue cancelled", row.slipNo)
+      if (editingRowId === row.salesSlipId) cancelEdit()
+      await refreshRows()
+    } catch (err) {
+      setError(errorMessage(err))
+    }
+  }
+
+  if (loading) {
+    return <div className="rounded-2xl border border-border bg-card p-8 text-muted-foreground shadow-[var(--shadow-panel)]">Loading masters...</div>
+  }
+
+  const activeLines = editingRowId ? editingLines : lines
+
+  return (
+    <div className="flex flex-col gap-6">
+      <div className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
+        <div className="flex items-center gap-3">
+          <Link href="/dashboard/sales" className={cn(buttonVariants({ variant: "outline", size: "icon" }))}>
+            <ArrowLeft className="size-4" />
+          </Link>
+          <div>
+            <h1 className="text-2xl font-bold text-foreground">Free Issues</h1>
+            <p className="text-base text-muted-foreground">Create and manage free-issue sales slips from the backend.</p>
+          </div>
+        </div>
+        <Button size="sm" onClick={submit} disabled={saving}>
+          <Save className="size-4" /> {saving ? "Saving..." : editingRowId ? "Update free issue" : "Create free issue"}
+        </Button>
+      </div>
+
+      {error ? <div className="rounded-lg border border-destructive/30 bg-destructive/5 p-5 text-base text-destructive">{error}</div> : null}
+
+      {editingRowId ? (
+        <section className="rounded-2xl border border-sky-200 bg-sky-50 shadow-[var(--shadow-panel)]">
+          <div className="flex items-center justify-between border-b border-sky-200 px-4 py-3">
+            <h2 className="text-sm font-semibold text-sky-900">Inline edit free issue</h2>
+            <Button type="button" variant="outline" size="sm" onClick={cancelEdit}>
+              <X className="size-4" /> Cancel edit
+            </Button>
+          </div>
+          <div className="overflow-x-auto">
+            <Table className="text-sm">
+              <TableHeader>
+                <TableRow>
+                  <TableHead className="h-12 px-4 text-sm">ID</TableHead>
+                  <TableHead className="h-12 px-4 text-sm">Item</TableHead>
+                  <TableHead className="h-12 px-4 text-sm">UOM</TableHead>
+                  <TableHead className="h-12 px-4 text-sm text-right">Qty</TableHead>
+                  <TableHead className="h-12 px-4 text-sm text-right">Free</TableHead>
+                  <TableHead className="h-12 px-4 text-sm" />
+                </TableRow>
+              </TableHeader>
+              <TableBody>
+                {activeLines.map((line, idx) => (
+                  <TableRow key={line.key} className="align-middle">
+                    <TableCell className="px-4 py-2 text-xs text-muted-foreground">{idx + 1}</TableCell>
+                    <TableCell className="px-4 py-2 min-w-80">
+                      <Select value={line.itemId ? String(line.itemId) : ""} onValueChange={(v) => selectEditingItem(line.key, Number(v))}>
+                        <SelectTrigger className="h-9 text-sm">
+                          <SelectValue placeholder="Select item" />
+                        </SelectTrigger>
+                        <SelectContent>
+                          {items.map((candidate) => (
+                            <SelectItem key={candidate.itemId} value={String(candidate.itemId)}>
+                              {candidate.sku} - {candidate.name}
+                            </SelectItem>
+                          ))}
+                        </SelectContent>
+                      </Select>
+                    </TableCell>
+                    <TableCell className="px-4 py-2 min-w-44">
+                      <Select value={line.uomId ? String(line.uomId) : ""} onValueChange={(v) => updateEditingLine(line.key, { uomId: Number(v) })}>
+                        <SelectTrigger className="h-9 text-sm">
+                          <SelectValue placeholder="UOM" />
+                        </SelectTrigger>
+                        <SelectContent>
+                          {uoms.map((u) => (
+                            <SelectItem key={u.uomId} value={String(u.uomId)}>
+                              {u.name}
+                            </SelectItem>
+                          ))}
+                        </SelectContent>
+                      </Select>
+                    </TableCell>
+                    <TableCell className="px-4 py-2">
+                      <Input type="number" min="0" step="1" value={line.qty} onChange={(e) => updateEditingLine(line.key, { qty: Number(e.target.value) })} className="h-9 w-24 text-right font-mono text-sm tabular-nums" />
+                    </TableCell>
+                    <TableCell className="px-4 py-2">
+                      <Input type="number" min="0" step="1" value={line.freeQty} onChange={(e) => updateEditingLine(line.key, { freeQty: Number(e.target.value) })} className="h-9 w-24 text-right font-mono text-sm tabular-nums" />
+                    </TableCell>
+                    <TableCell className="px-4 py-2 text-right text-xs text-muted-foreground">editing</TableCell>
+                  </TableRow>
+                ))}
+              </TableBody>
+            </Table>
+          </div>
+        </section>
+      ) : (
+        <section className="rounded-2xl border border-border bg-card shadow-[var(--shadow-panel)]">
+          <div className="flex items-center justify-between border-b border-border px-4 py-3">
+            <h2 className="text-sm font-semibold">Free issue lines</h2>
+            <Button type="button" variant="outline" size="sm" onClick={addLine}>
+              <Plus className="size-4" /> Add line
+            </Button>
+          </div>
+          <div className="overflow-x-auto">
+            <Table className="text-sm">
+              <TableHeader>
+                <TableRow>
+                  <TableHead className="h-12 px-4 text-sm">ID</TableHead>
+                  <TableHead className="h-12 px-4 text-sm">Item</TableHead>
+                  <TableHead className="h-12 px-4 text-sm">UOM</TableHead>
+                  <TableHead className="h-12 px-4 text-sm text-right">Qty</TableHead>
+                  <TableHead className="h-12 px-4 text-sm text-right">Free</TableHead>
+                  <TableHead className="h-12 px-4 text-sm" />
+                </TableRow>
+              </TableHeader>
+              <TableBody>
+                {lines.map((line, idx) => (
+                  <TableRow key={line.key} className="align-middle">
+                    <TableCell className="px-4 py-2 text-xs text-muted-foreground">{idx + 1}</TableCell>
+                    <TableCell className="px-4 py-2 min-w-80">
+                      <Select value={line.itemId ? String(line.itemId) : ""} onValueChange={(v) => selectItem(line.key, Number(v))}>
+                        <SelectTrigger className="h-9 text-sm">
+                          <SelectValue placeholder="Select item" />
+                        </SelectTrigger>
+                        <SelectContent>
+                          {items.map((candidate) => (
+                            <SelectItem key={candidate.itemId} value={String(candidate.itemId)}>
+                              {candidate.sku} - {candidate.name}
+                            </SelectItem>
+                          ))}
+                        </SelectContent>
+                      </Select>
+                    </TableCell>
+                    <TableCell className="px-4 py-2 min-w-44">
+                      <Select value={line.uomId ? String(line.uomId) : ""} onValueChange={(v) => updateLine(line.key, { uomId: Number(v) })}>
+                        <SelectTrigger className="h-9 text-sm">
+                          <SelectValue placeholder="UOM" />
+                        </SelectTrigger>
+                        <SelectContent>
+                          {uoms.map((u) => (
+                            <SelectItem key={u.uomId} value={String(u.uomId)}>
+                              {u.name}
+                            </SelectItem>
+                          ))}
+                        </SelectContent>
+                      </Select>
+                    </TableCell>
+                    <TableCell className="px-4 py-2">
+                      <Input type="number" min="0" step="1" value={line.qty} onChange={(e) => updateLine(line.key, { qty: Number(e.target.value) })} className="h-9 w-24 text-right font-mono text-sm tabular-nums" />
+                    </TableCell>
+                    <TableCell className="px-4 py-2">
+                      <Input type="number" min="0" step="1" value={line.freeQty} onChange={(e) => updateLine(line.key, { freeQty: Number(e.target.value) })} className="h-9 w-24 text-right font-mono text-sm tabular-nums" />
+                    </TableCell>
+                    <TableCell className="px-4 py-2 text-right">
+                      <Button variant="ghost" size="icon" className="size-8 text-muted-foreground" onClick={() => removeLine(line.key)} disabled={lines.length === 1}>
+                        <Trash2 className="size-4" />
+                      </Button>
+                    </TableCell>
+                  </TableRow>
+                ))}
+              </TableBody>
+            </Table>
+          </div>
+        </section>
+      )}
+
+      <section className="rounded-2xl border border-border bg-card p-4 shadow-[var(--shadow-panel)]">
+        <div className="flex items-center justify-between">
+          <div>
+            <h3 className="text-sm font-semibold">Created free issues</h3>
+            <p className="mt-1 text-xs text-muted-foreground">Persisted backend records with draft-only cancellation.</p>
+          </div>
+          <Button variant="outline" size="sm" onClick={refreshRows}>
+            Refresh
+          </Button>
+        </div>
+        <div className="mt-3 overflow-x-auto">
+          <Table className="text-sm">
+            <TableHeader>
+              <TableRow>
+                <TableHead className="h-12 px-4 text-sm">Promotion</TableHead>
+                <TableHead className="h-12 px-4 text-sm">Warehouse</TableHead>
+                <TableHead className="h-12 px-4 text-sm">Product</TableHead>
+                <TableHead className="h-12 px-4 text-sm text-right">Qty</TableHead>
+                <TableHead className="h-12 px-4 text-sm text-right">Free</TableHead>
+                <TableHead className="h-12 px-4 text-sm text-right">Actions</TableHead>
+              </TableRow>
+            </TableHeader>
+            <TableBody>
+              {rows.length > 0 ? (
+                rows.map((row) => (
+                  <TableRow key={row.salesSlipId} className="hover:bg-muted/40">
+                    <TableCell className="px-4 py-3.5">
+                      <div className="font-medium">Buy {row.qty} Get {row.freeQty || 0}</div>
+                      <div className="text-xs text-muted-foreground">{row.slipNo}</div>
+                    </TableCell>
+                    <TableCell className="px-4 py-3.5">{row.warehouseName}</TableCell>
+                    <TableCell className="px-4 py-3.5 min-w-80">
+                      <div className="font-medium">{row.itemName}</div>
+                      <div className="text-xs text-muted-foreground">{row.itemSku} · {row.uomName}</div>
+                    </TableCell>
+                    <TableCell className="px-4 py-3.5 text-right font-mono tabular-nums">{row.qty}</TableCell>
+                    <TableCell className="px-4 py-3.5 text-right font-mono tabular-nums">{row.freeQty}</TableCell>
+                    <TableCell className="px-4 py-3.5">
+                      <div className="flex justify-end gap-1.5">
+                        <button
+                          type="button"
+                          onClick={() => startEdit(row)}
+                          className="inline-flex h-7 items-center rounded-full border border-sky-200 bg-sky-50 px-2 text-xs text-sky-700 hover:bg-sky-100 hover:text-sky-800"
+                        >
+                          <Pencil className="mr-1 size-3.5" />
+                          Edit
+                        </button>
+                        {row.status === "Draft" ? (
+                          <button
+                            type="button"
+                            onClick={() => deleteRow(row)}
+                            className="inline-flex h-7 items-center rounded-full border border-rose-200 bg-rose-50 px-2 text-xs text-rose-700 hover:bg-rose-100 hover:text-rose-800"
+                          >
+                            <Trash2 className="mr-1 size-3.5" />
+                            Delete
+                          </button>
+                        ) : null}
+                      </div>
+                    </TableCell>
+                  </TableRow>
+                ))
+              ) : (
+                <TableRow>
+                  <TableCell colSpan={6} className="px-4 py-8 text-center text-sm text-muted-foreground">
+                    No free issues created yet.
+                  </TableCell>
+                </TableRow>
+              )}
+            </TableBody>
+          </Table>
+        </div>
+      </section>
+    </div>
+  )
+}

Frontend/erp-system/app/dashboard/sales/free-issues/page.tsx

@@ -0,0 +1,3 @@
+"use client"
+
+export { default } from "./new/page"