Distribution/Data/AppDBContext.cs

@@ -22,6 +22,9 @@ public class AppDBContext(DbContextOptions<AppDBContext> options) : DbContext(op
     public DbSet<ShopPO> ShopPOs { get; set; }
     public DbSet<ShopPOItem> ShopPOItems { get; set; }
     public DbSet<Invoice> Invoices { get; set; }
+    public DbSet<InvoiceItem> InvoiceItems { get; set; }
+    public DbSet<InvoiceVersion> InvoiceVersions { get; set; }
+    public DbSet<InvoiceVersionItem> InvoiceVersionItems { get; set; }
     public DbSet<LoadingSheetOrder> LoadingSheetOrders { get; set; }
     public DbSet<DeliveryRun> DeliveryRuns { get; set; }
     public DbSet<User> Users { get; set; }
@@ -175,6 +178,54 @@ public class AppDBContext(DbContextOptions<AppDBContext> options) : DbContext(op
             .HasForeignKey(i => i.FK_ShopPOId)
             .OnDelete(DeleteBehavior.Restrict);
 
+        modelBuilder.Entity<InvoiceItem>()
+            .HasOne(i => i.Invoice)
+            .WithMany(inv => inv.Items)
+            .HasForeignKey(i => i.FK_InvoiceId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        modelBuilder.Entity<InvoiceItem>()
+            .HasOne(i => i.ShopPOItem)
+            .WithMany()
+            .HasForeignKey(i => i.FK_ShopPOItemId)
+            .OnDelete(DeleteBehavior.Restrict)
+            .IsRequired(false);
+
+        modelBuilder.Entity<InvoiceItem>()
+            .HasOne(i => i.Item)
+            .WithMany()
+            .HasForeignKey(i => i.FK_ItemId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        modelBuilder.Entity<InvoiceVersion>()
+            .HasOne(v => v.Invoice)
+            .WithMany()
+            .HasForeignKey(v => v.FK_InvoiceId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        modelBuilder.Entity<InvoiceVersion>()
+            .HasIndex(v => new { v.FK_InvoiceId, v.VersionNumber })
+            .IsUnique();
+
+        modelBuilder.Entity<InvoiceVersionItem>()
+            .HasOne(i => i.InvoiceVersion)
+            .WithMany(v => v.Items)
+            .HasForeignKey(i => i.FK_InvoiceVersionId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        modelBuilder.Entity<InvoiceVersionItem>()
+            .HasOne(i => i.ShopPOItem)
+            .WithMany()
+            .HasForeignKey(i => i.FK_ShopPOItemId)
+            .OnDelete(DeleteBehavior.Restrict)
+            .IsRequired(false);
+
+        modelBuilder.Entity<InvoiceVersionItem>()
+            .HasOne(i => i.Item)
+            .WithMany()
+            .HasForeignKey(i => i.FK_ItemId)
+            .OnDelete(DeleteBehavior.Restrict);
+
         modelBuilder.Entity<Invoice>()
             .HasMany(i => i.Payments)
             .WithOne(p => p.Invoice)

Distribution/Features/Invoice/IInvoiceRepository.cs

@@ -10,5 +10,10 @@ public interface IInvoiceRepository
     Task<int> GetCountAsync(Guid? agentId, Guid? routeId, Guid? shopId, InvoiceStatus? status, PaymentStatus? paymentStatus);
     Task<List<Models.Invoice>> GetOutstandingAsync();
     Task AddAsync(Models.Invoice invoice);
+    Task<Models.Item?> GetItemAsync(Guid itemId);
+    Task AddItemsAsync(IEnumerable<InvoiceItem> items);
+    Task AddVersionAsync(InvoiceVersion version);
+    Task<int> GetLatestVersionNumberAsync(Guid invoiceId);
+    Task<List<InvoiceVersion>> GetVersionsAsync(Guid invoiceId);
     void Update(Models.Invoice invoice);
 }

Distribution/Features/Invoice/InvoiceController.cs

@@ -52,6 +52,29 @@ public class InvoiceController(InvoiceService service, ICurrentUserService curre
         catch (InvalidOperationException ex) { return BadRequest(new { error = ex.Message }); }
     }
 
+    [HttpGet("{id:guid}/versions")]
+    public async Task<IActionResult> GetVersions(Guid id)
+    {
+        var result = await service.GetVersionsAsync(id);
+        return result is null ? NotFound() : Ok(result);
+    }
+
+    [HttpPut("{id:guid}/items")]
+    public async Task<IActionResult> UpdateItems(Guid id, [FromBody] UpdateInvoiceItemsRequest request, CancellationToken ct)
+    {
+        // TEMPORARY: currentUser.UserId is always unset due to the broken auth middleware
+        // (testbug.md #28) — fall back to the explicitly supplied user until that's fixed.
+        var userId = currentUser.UserId ?? request.EditedByUserId;
+        if (userId is null) return BadRequest(new { error = "EditedByUserId is required while auth is unavailable" });
+        try
+        {
+            var result = await service.UpdateItemsAsync(id, request, userId.Value, ct);
+            return Ok(result);
+        }
+        catch (KeyNotFoundException) { return NotFound(); }
+        catch (InvalidOperationException ex) { return BadRequest(new { error = ex.Message }); }
+    }
+
     [HttpPost("{id:guid}/print")]
     public async Task<IActionResult> Print(Guid id, [FromBody] PrintInvoiceRequest? request, CancellationToken ct)
     {

Distribution/Features/Invoice/InvoiceDTOs.cs

@@ -3,10 +3,35 @@
 namespace Distribution.Features.Invoice;
 
 public record CreateInvoiceRequest(Guid ShopPOId, Guid? CreatedByUserId = null);
-public record InvoiceItemAdjustment(Guid ShopPOItemId, int AdjustedQuantity, string? Note = null);
+public record InvoiceItemAdjustment(Guid InvoiceItemId, int AdjustedQuantity, bool IsRemoved = false, string? Note = null);
 public record FinalizeInvoiceRequest(List<InvoiceItemAdjustment>? Adjustments = null, Guid? FinalizedByUserId = null);
 public record PrintInvoiceRequest(Guid? PrintedByUserId = null);
 
+// InvoiceItemId set = edit/remove/restore an existing line; ItemId set (InvoiceItemId null) = add a new line.
+public record InvoiceItemEdit(Guid? InvoiceItemId, Guid? ItemId, int Quantity, decimal? UnitPrice = null, bool IsRemoved = false);
+public record UpdateInvoiceItemsRequest(List<InvoiceItemEdit> Items, Guid? EditedByUserId = null);
+
+public record InvoiceVersionItemResponse(Guid? ShopPOItemId, Guid ItemId, string ItemName, int Quantity, decimal UnitPrice, bool IsRemoved);
+
+public record InvoiceVersionResponse(
+    Guid Id,
+    int VersionNumber,
+    InvoiceVersionStage Stage,
+    decimal TotalAmount,
+    Guid CreatedBy,
+    DateTime CreatedAt,
+    List<InvoiceVersionItemResponse> Items);
+
+public record InvoiceItemResponse(
+    Guid Id,
+    Guid? ShopPOItemId,
+    Guid ItemId,
+    string ItemName,
+    int? OrderedQuantity,
+    int Quantity,
+    decimal UnitPrice,
+    bool IsRemoved);
+
 public record InvoiceResponse(
     Guid Id,
     Guid ShopPOId,
@@ -22,6 +47,7 @@ public record InvoiceResponse(
     decimal TotalAmount,
     decimal PaidAmount,
     bool IsActive,
-    DateTime CreatedAt);
+    DateTime CreatedAt,
+    List<InvoiceItemResponse> Items);
 
 public record OutstandingPaymentsResponse(int InvoiceCount, decimal OutstandingAmount);

Distribution/Features/Invoice/InvoiceRepository.cs

@@ -10,6 +10,8 @@ public class InvoiceRepository(AppDBContext context) : IInvoiceRepository
         await context.Invoices
             .Include(i => i.ShopPO).ThenInclude(p => p.Store)
             .Include(i => i.ShopPO).ThenInclude(p => p.Items.Where(x => x.IsActive))
+            .Include(i => i.Items.Where(x => x.IsActive)).ThenInclude(x => x.Item)
+            .Include(i => i.Items.Where(x => x.IsActive)).ThenInclude(x => x.ShopPOItem)
             .Include(i => i.Payments.Where(p => p.IsActive))
             .FirstOrDefaultAsync(i => i.Id == id && i.IsActive);
 
@@ -52,6 +54,27 @@ public class InvoiceRepository(AppDBContext context) : IInvoiceRepository
     public async Task AddAsync(Models.Invoice invoice) =>
         await context.Invoices.AddAsync(invoice);
 
+    public async Task<Models.Item?> GetItemAsync(Guid itemId) =>
+        await context.Items.FirstOrDefaultAsync(i => i.Id == itemId && i.IsActive);
+
+    public async Task AddItemsAsync(IEnumerable<InvoiceItem> items) =>
+        await context.InvoiceItems.AddRangeAsync(items);
+
+    public async Task AddVersionAsync(InvoiceVersion version) =>
+        await context.InvoiceVersions.AddAsync(version);
+
+    public async Task<int> GetLatestVersionNumberAsync(Guid invoiceId) =>
+        await context.InvoiceVersions
+            .Where(v => v.FK_InvoiceId == invoiceId)
+            .MaxAsync(v => (int?)v.VersionNumber) ?? 0;
+
+    public async Task<List<InvoiceVersion>> GetVersionsAsync(Guid invoiceId) =>
+        await context.InvoiceVersions
+            .Include(v => v.Items).ThenInclude(i => i.Item)
+            .Where(v => v.FK_InvoiceId == invoiceId && v.IsActive)
+            .OrderBy(v => v.VersionNumber)
+            .ToListAsync();
+
     public void Update(Models.Invoice invoice) =>
         context.Invoices.Update(invoice);
 }

Distribution/Features/Invoice/InvoiceService.cs

@@ -21,7 +21,61 @@ public class InvoiceService(
             i.FinalizedAt, i.FinalizedBy,
             i.TotalAmount,
             i.Payments?.Where(p => p.IsActive).Sum(p => p.Amount) ?? 0m,
-            i.IsActive, i.CreatedAt);
+            i.IsActive, i.CreatedAt,
+            i.Items.Where(x => x.IsActive).Select(x =>
+                new InvoiceItemResponse(x.Id, x.FK_ShopPOItemId, x.FK_ItemId,
+                    x.Item?.Name ?? string.Empty, x.ShopPOItem?.Quantity,
+                    x.Quantity, x.UnitPrice, x.IsRemoved)).ToList());
+
+    private static decimal BillableTotal(IEnumerable<InvoiceItem> items) =>
+        items.Where(i => i.IsActive && !i.IsRemoved).Sum(i => i.Quantity * i.UnitPrice);
+
+    // Immutable copy of the invoice lines as they stand right now.
+    public static InvoiceVersion BuildVersion(Models.Invoice invoice, IEnumerable<InvoiceItem> items, int versionNumber, InvoiceVersionStage stage, Guid userId) =>
+        new()
+        {
+            FK_InvoiceId = invoice.Id,
+            VersionNumber = versionNumber,
+            Stage = stage,
+            TotalAmount = invoice.TotalAmount,
+            CreatedBy = userId,
+            Items = items.Select(i => new InvoiceVersionItem
+            {
+                FK_ShopPOItemId = i.FK_ShopPOItemId,
+                FK_ItemId = i.FK_ItemId,
+                Quantity = i.Quantity,
+                UnitPrice = i.UnitPrice,
+                IsRemoved = i.IsRemoved
+            }).ToList()
+        };
+
+    public async Task<List<InvoiceVersionResponse>?> GetVersionsAsync(Guid id)
+    {
+        if (await repo.GetByIdAsync(id) is null) return null;
+        var versions = await repo.GetVersionsAsync(id);
+        return versions.Select(v => new InvoiceVersionResponse(
+            v.Id, v.VersionNumber, v.Stage, v.TotalAmount, v.CreatedBy, v.CreatedAt,
+            v.Items.Select(i => new InvoiceVersionItemResponse(
+                i.FK_ShopPOItemId, i.FK_ItemId, i.Item?.Name ?? string.Empty, i.Quantity, i.UnitPrice, i.IsRemoved)).ToList())).ToList();
+    }
+
+    private async Task AddVersionAsync(Models.Invoice invoice, InvoiceVersionStage stage, Guid userId, IEnumerable<InvoiceItem>? addedLines = null)
+    {
+        var next = await repo.GetLatestVersionNumberAsync(invoice.Id) + 1;
+        // Added lines may or may not be in invoice.Items yet, so merge by reference.
+        var lines = invoice.Items.Concat(addedLines ?? []).Where(i => i.IsActive).Distinct();
+        await repo.AddVersionAsync(BuildVersion(invoice, lines, next, stage, userId));
+    }
+
+    public static List<InvoiceItem> BuildItemsFromShopPO(Models.ShopPO po, Guid invoiceId) =>
+        po.Items.Where(i => i.IsActive).Select(i => new InvoiceItem
+        {
+            FK_InvoiceId = invoiceId,
+            FK_ShopPOItemId = i.Id,
+            FK_ItemId = i.FK_ItemId,
+            Quantity = i.Quantity,
+            UnitPrice = i.UnitPrice
+        }).ToList();
 
     public async Task<InvoiceResponse?> GetByIdAsync(Guid id)
     {
@@ -69,6 +123,9 @@ public class InvoiceService(
         try
         {
             await repo.AddAsync(invoice);
+            var lines = BuildItemsFromShopPO(po, invoice.Id);
+            await repo.AddItemsAsync(lines);
+            await repo.AddVersionAsync(BuildVersion(invoice, lines, 1, InvoiceVersionStage.Created, createdBy));
             po.InvoiceId = invoice.Id;
             shopPoRepo.Update(po);
             await uow.CommitAsync(ct);
@@ -79,6 +136,85 @@ public class InvoiceService(
         return ToResponse(saved!);
     }
 
+    public async Task<InvoiceResponse> UpdateItemsAsync(Guid id, UpdateInvoiceItemsRequest request, Guid editedBy, CancellationToken ct = default)
+    {
+        var invoice = await repo.GetByIdAsync(id)
+            ?? throw new KeyNotFoundException("Invoice not found");
+
+        if (invoice.Status != InvoiceStatus.Draft)
+            throw new InvalidOperationException($"Items can only be edited while the invoice is Draft (current: {invoice.Status})");
+
+        var newLines = new List<InvoiceItem>();
+
+        foreach (var edit in request.Items)
+        {
+            if (edit.UnitPrice is < 0)
+                throw new InvalidOperationException("Unit price cannot be negative");
+
+            if (edit.InvoiceItemId is Guid lineId)
+            {
+                // Existing line: edit quantity/price, or strike it (IsRemoved) / restore it.
+                var item = invoice.Items.FirstOrDefault(i => i.Id == lineId && i.IsActive)
+                    ?? throw new InvalidOperationException($"Invoice item {lineId} not found on this invoice");
+
+                item.IsRemoved = edit.IsRemoved;
+                if (!edit.IsRemoved)
+                {
+                    ValidateQuantity(item, edit.Quantity);
+                    item.Quantity = edit.Quantity;
+                }
+                if (edit.UnitPrice is decimal price) item.UnitPrice = price;
+            }
+            else if (edit.ItemId is Guid itemId)
+            {
+                // New line for an item that was not on the PO.
+                if (edit.IsRemoved) continue;
+                if (edit.Quantity <= 0)
+                    throw new InvalidOperationException("Quantity for an added item must be greater than zero");
+                if (edit.UnitPrice is null)
+                    throw new InvalidOperationException("Unit price is required for an added item");
+                if (invoice.Items.Concat(newLines).Any(i => i.IsActive && !i.IsRemoved && i.FK_ItemId == itemId))
+                    throw new InvalidOperationException("This item is already on the invoice — edit its existing line instead");
+
+                var catalogItem = await repo.GetItemAsync(itemId)
+                    ?? throw new InvalidOperationException($"Item {itemId} not found");
+
+                newLines.Add(new InvoiceItem
+                {
+                    FK_InvoiceId = invoice.Id,
+                    FK_ItemId = catalogItem.Id,
+                    Item = catalogItem,
+                    Quantity = edit.Quantity,
+                    UnitPrice = edit.UnitPrice.Value
+                });
+            }
+            else
+                throw new InvalidOperationException("Each edit needs an invoiceItemId (existing line) or an itemId (new line)");
+        }
+
+        invoice.TotalAmount = BillableTotal(invoice.Items.Concat(newLines));
+
+        await uow.BeginAsync(ct);
+        try
+        {
+            repo.Update(invoice);
+            if (newLines.Count > 0) await repo.AddItemsAsync(newLines);
+            await AddVersionAsync(invoice, InvoiceVersionStage.DraftEdited, editedBy, newLines);
+            await uow.CommitAsync(ct);
+        }
+        catch { await uow.RollbackAsync(ct); throw; }
+
+        return ToResponse((await repo.GetByIdAsync(id))!);
+    }
+
+    private static void ValidateQuantity(InvoiceItem item, int quantity)
+    {
+        var ordered = item.ShopPOItem?.Quantity ?? int.MaxValue;
+        if (quantity < 0 || quantity > ordered)
+            throw new InvalidOperationException(
+                $"Quantity for item {item.Id} must be between 0 and {ordered}");
+    }
+
     public async Task<InvoiceResponse> PrintAsync(Guid id, Guid printedBy, CancellationToken ct = default)
     {
         var invoice = await repo.GetByIdAsync(id)
@@ -92,7 +228,12 @@ public class InvoiceService(
         invoice.PrintedBy = printedBy;
 
         await uow.BeginAsync(ct);
-        try { repo.Update(invoice); await uow.CommitAsync(ct); }
+        try
+        {
+            repo.Update(invoice);
+            await AddVersionAsync(invoice, InvoiceVersionStage.Printed, printedBy);
+            await uow.CommitAsync(ct);
+        }
         catch { await uow.RollbackAsync(ct); throw; }
 
         return ToResponse(invoice);
@@ -106,31 +247,37 @@ public class InvoiceService(
         if (invoice.Status != InvoiceStatus.Printed)
             throw new InvalidOperationException($"Cannot finalize an invoice in {invoice.Status} status");
 
+        var items = invoice.Items.Where(i => i.IsActive).ToList();
         var adjustments = request.Adjustments ?? [];
-        if (adjustments.Count > 0)
+
+        // Agent's handwritten edits from the printed copy are written onto the invoice lines.
+        foreach (var adjustment in adjustments)
         {
-            var poItems = invoice.ShopPO.Items.Where(i => i.IsActive).ToList();
-            decimal total = 0;
-            foreach (var item in poItems)
+            var item = items.FirstOrDefault(i => i.Id == adjustment.InvoiceItemId)
+                ?? throw new InvalidOperationException($"Invoice item {adjustment.InvoiceItemId} is not on this invoice");
+
+            item.IsRemoved = adjustment.IsRemoved;
+            if (!adjustment.IsRemoved)
             {
-                var adjustment = adjustments.FirstOrDefault(a => a.ShopPOItemId == item.Id);
-                var billedQuantity = adjustment is not null ? adjustment.AdjustedQuantity : item.Quantity;
-
-                if (billedQuantity < 0 || billedQuantity > item.Quantity)
-                    throw new InvalidOperationException(
-                        $"Adjusted quantity for item {item.Id} must be between 0 and {item.Quantity}");
-
-                total += billedQuantity * item.UnitPrice;
+                ValidateQuantity(item, adjustment.AdjustedQuantity);
+                item.Quantity = adjustment.AdjustedQuantity;
             }
-            invoice.TotalAmount = total;
         }
 
+        if (items.Count > 0)
+            invoice.TotalAmount = BillableTotal(items);
+
         invoice.Status = InvoiceStatus.Finalized;
         invoice.FinalizedAt = DateTime.Now;
         invoice.FinalizedBy = finalizedBy;
 
         await uow.BeginAsync(ct);
-        try { repo.Update(invoice); await uow.CommitAsync(ct); }
+        try
+        {
+            repo.Update(invoice);
+            await AddVersionAsync(invoice, InvoiceVersionStage.Finalized, finalizedBy);
+            await uow.CommitAsync(ct);
+        }
         catch { await uow.RollbackAsync(ct); throw; }
 
         return ToResponse(invoice);

Distribution/Features/ShopPO/ShopPOService.cs

@@ -217,6 +217,9 @@ public class ShopPOService(
         try
         {
             await invoiceRepo.AddAsync(invoice);
+            var lines = InvoiceService.BuildItemsFromShopPO(po, invoice.Id);
+            await invoiceRepo.AddItemsAsync(lines);
+            await invoiceRepo.AddVersionAsync(InvoiceService.BuildVersion(invoice, lines, 1, InvoiceVersionStage.Created, userId));
             po.InvoiceId = invoice.Id;
             repo.Update(po);
             await uow.CommitAsync(ct);

Distribution/Migrations/20261020123138_AddInvoiceItems.cs

@@ -0,0 +1,81 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Distribution.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddInvoiceItems : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "InvoiceItems",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
+                    FK_InvoiceId = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
+                    FK_ShopPOItemId = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
+                    FK_ItemId = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
+                    Quantity = table.Column<int>(type: "int", nullable: false),
+                    UnitPrice = table.Column<decimal>(type: "decimal(65,30)", nullable: false),
+                    CreatedAt = table.Column<DateTime>(type: "datetime(6)", nullable: false),
+                    IsActive = table.Column<bool>(type: "tinyint(1)", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_InvoiceItems", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_InvoiceItems_Invoices_FK_InvoiceId",
+                        column: x => x.FK_InvoiceId,
+                        principalTable: "Invoices",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                    table.ForeignKey(
+                        name: "FK_InvoiceItems_Items_FK_ItemId",
+                        column: x => x.FK_ItemId,
+                        principalTable: "Items",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                    table.ForeignKey(
+                        name: "FK_InvoiceItems_ShopPOItems_FK_ShopPOItemId",
+                        column: x => x.FK_ShopPOItemId,
+                        principalTable: "ShopPOItems",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                })
+                .Annotation("MySql:CharSet", "utf8mb4");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_InvoiceItems_FK_InvoiceId",
+                table: "InvoiceItems",
+                column: "FK_InvoiceId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_InvoiceItems_FK_ItemId",
+                table: "InvoiceItems",
+                column: "FK_ItemId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_InvoiceItems_FK_ShopPOItemId",
+                table: "InvoiceItems",
+                column: "FK_ShopPOItemId");
+
+            // Backfill: snapshot each existing invoice's PO lines so older invoices can be edited/finalized.
+            migrationBuilder.Sql(@"
+                INSERT INTO InvoiceItems (Id, FK_InvoiceId, FK_ShopPOItemId, FK_ItemId, Quantity, UnitPrice, CreatedAt, IsActive)
+                SELECT UUID(), inv.Id, poi.Id, poi.FK_ItemId, poi.Quantity, poi.UnitPrice, NOW(6), 1
+                FROM Invoices inv
+                JOIN ShopPOItems poi ON poi.FK_ShopPOId = inv.FK_ShopPOId AND poi.IsActive = 1;");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "InvoiceItems");
+        }
+    }
+}

Distribution/Migrations/20261021052554_AddInvoiceVersionsAndLineEdits.cs

@@ -0,0 +1,157 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Distribution.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddInvoiceVersionsAndLineEdits : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AlterColumn<Guid>(
+                name: "FK_ShopPOItemId",
+                table: "InvoiceItems",
+                type: "char(36)",
+                nullable: true,
+                collation: "ascii_general_ci",
+                oldClrType: typeof(Guid),
+                oldType: "char(36)")
+                .OldAnnotation("Relational:Collation", "ascii_general_ci");
+
+            migrationBuilder.AddColumn<bool>(
+                name: "IsRemoved",
+                table: "InvoiceItems",
+                type: "tinyint(1)",
+                nullable: false,
+                defaultValue: false);
+
+            migrationBuilder.CreateTable(
+                name: "InvoiceVersions",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
+                    FK_InvoiceId = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
+                    VersionNumber = table.Column<int>(type: "int", nullable: false),
+                    Stage = table.Column<int>(type: "int", nullable: false),
+                    TotalAmount = table.Column<decimal>(type: "decimal(65,30)", nullable: false),
+                    CreatedBy = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
+                    CreatedAt = table.Column<DateTime>(type: "datetime(6)", nullable: false),
+                    IsActive = table.Column<bool>(type: "tinyint(1)", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_InvoiceVersions", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_InvoiceVersions_Invoices_FK_InvoiceId",
+                        column: x => x.FK_InvoiceId,
+                        principalTable: "Invoices",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                })
+                .Annotation("MySql:CharSet", "utf8mb4");
+
+            migrationBuilder.CreateTable(
+                name: "InvoiceVersionItems",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
+                    FK_InvoiceVersionId = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
+                    FK_ShopPOItemId = table.Column<Guid>(type: "char(36)", nullable: true, collation: "ascii_general_ci"),
+                    FK_ItemId = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
+                    Quantity = table.Column<int>(type: "int", nullable: false),
+                    UnitPrice = table.Column<decimal>(type: "decimal(65,30)", nullable: false),
+                    IsRemoved = table.Column<bool>(type: "tinyint(1)", nullable: false),
+                    CreatedAt = table.Column<DateTime>(type: "datetime(6)", nullable: false),
+                    IsActive = table.Column<bool>(type: "tinyint(1)", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_InvoiceVersionItems", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_InvoiceVersionItems_InvoiceVersions_FK_InvoiceVersionId",
+                        column: x => x.FK_InvoiceVersionId,
+                        principalTable: "InvoiceVersions",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                    table.ForeignKey(
+                        name: "FK_InvoiceVersionItems_Items_FK_ItemId",
+                        column: x => x.FK_ItemId,
+                        principalTable: "Items",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                    table.ForeignKey(
+                        name: "FK_InvoiceVersionItems_ShopPOItems_FK_ShopPOItemId",
+                        column: x => x.FK_ShopPOItemId,
+                        principalTable: "ShopPOItems",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                })
+                .Annotation("MySql:CharSet", "utf8mb4");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_InvoiceVersionItems_FK_InvoiceVersionId",
+                table: "InvoiceVersionItems",
+                column: "FK_InvoiceVersionId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_InvoiceVersionItems_FK_ItemId",
+                table: "InvoiceVersionItems",
+                column: "FK_ItemId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_InvoiceVersionItems_FK_ShopPOItemId",
+                table: "InvoiceVersionItems",
+                column: "FK_ShopPOItemId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_InvoiceVersions_FK_InvoiceId_VersionNumber",
+                table: "InvoiceVersions",
+                columns: new[] { "FK_InvoiceId", "VersionNumber" },
+                unique: true);
+
+            // Backfill: one baseline version per existing invoice from its current lines.
+            migrationBuilder.Sql(@"
+                INSERT INTO InvoiceVersions (Id, FK_InvoiceId, VersionNumber, Stage, TotalAmount, CreatedBy, CreatedAt, IsActive)
+                SELECT UUID(), inv.Id, 1,
+                       CASE inv.Status WHEN 0 THEN 0 WHEN 1 THEN 2 ELSE 3 END,
+                       inv.TotalAmount, inv.CreatedBy, NOW(6), 1
+                FROM Invoices inv;");
+
+            migrationBuilder.Sql(@"
+                INSERT INTO InvoiceVersionItems (Id, FK_InvoiceVersionId, FK_ShopPOItemId, FK_ItemId, Quantity, UnitPrice, IsRemoved, CreatedAt, IsActive)
+                SELECT UUID(), v.Id, ii.FK_ShopPOItemId, ii.FK_ItemId, ii.Quantity, ii.UnitPrice, ii.IsRemoved, NOW(6), 1
+                FROM InvoiceVersions v
+                JOIN InvoiceItems ii ON ii.FK_InvoiceId = v.FK_InvoiceId AND ii.IsActive = 1
+                WHERE v.VersionNumber = 1;");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "InvoiceVersionItems");
+
+            migrationBuilder.DropTable(
+                name: "InvoiceVersions");
+
+            migrationBuilder.DropColumn(
+                name: "IsRemoved",
+                table: "InvoiceItems");
+
+            migrationBuilder.AlterColumn<Guid>(
+                name: "FK_ShopPOItemId",
+                table: "InvoiceItems",
+                type: "char(36)",
+                nullable: false,
+                defaultValue: new Guid("00000000-0000-0000-0000-000000000000"),
+                collation: "ascii_general_ci",
+                oldClrType: typeof(Guid),
+                oldType: "char(36)",
+                oldNullable: true)
+                .OldAnnotation("Relational:Collation", "ascii_general_ci");
+        }
+    }
+}

Distribution/Models/Enums.cs

@@ -18,6 +18,7 @@ namespace Distribution.Models
     public enum ShopPOStatus { Pending, PartiallyFulfilled, Fulfilled, Cancelled }
 
     public enum InvoiceStatus { Draft, Printed, Finalized }
+    public enum InvoiceVersionStage { Created, DraftEdited, Printed, Finalized }
 
     public enum PaymentStatus { Pending, PartiallyPaid, Paid }
 

Distribution/Models/Invoice.cs

@@ -21,6 +21,7 @@ namespace Distribution.Models
 
         public decimal TotalAmount { get; set; }
 
+        public ICollection<InvoiceItem> Items { get; set; } = new List<InvoiceItem>();
         public ICollection<Payment> Payments { get; set; } = new List<Payment>();
     }
 }

Distribution/Models/InvoiceItem.cs

@@ -0,0 +1,23 @@
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Distribution.Models
+{
+    public class InvoiceItem : Template
+    {
+        public Guid FK_InvoiceId { get; set; }
+        [ForeignKey("FK_InvoiceId")]
+        public Invoice Invoice { get; set; }
+
+        public Guid? FK_ShopPOItemId { get; set; }
+        [ForeignKey("FK_ShopPOItemId")]
+        public ShopPOItem? ShopPOItem { get; set; }
+
+        public Guid FK_ItemId { get; set; }
+        [ForeignKey("FK_ItemId")]
+        public Item Item { get; set; }
+
+        public int Quantity { get; set; }
+        public decimal UnitPrice { get; set; }
+        public bool IsRemoved { get; set; }
+    }
+}

Distribution/Models/InvoiceVersion.cs

@@ -0,0 +1,19 @@
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Distribution.Models
+{
+    // Immutable snapshot of an invoice's lines at a point in its lifecycle.
+    public class InvoiceVersion : Template
+    {
+        public Guid FK_InvoiceId { get; set; }
+        [ForeignKey("FK_InvoiceId")]
+        public Invoice Invoice { get; set; }
+
+        public int VersionNumber { get; set; }
+        public InvoiceVersionStage Stage { get; set; }
+        public decimal TotalAmount { get; set; }
+        public Guid CreatedBy { get; set; }
+
+        public ICollection<InvoiceVersionItem> Items { get; set; } = new List<InvoiceVersionItem>();
+    }
+}

Distribution/Models/InvoiceVersionItem.cs

@@ -0,0 +1,23 @@
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Distribution.Models
+{
+    public class InvoiceVersionItem : Template
+    {
+        public Guid FK_InvoiceVersionId { get; set; }
+        [ForeignKey("FK_InvoiceVersionId")]
+        public InvoiceVersion InvoiceVersion { get; set; }
+
+        public Guid? FK_ShopPOItemId { get; set; }
+        [ForeignKey("FK_ShopPOItemId")]
+        public ShopPOItem? ShopPOItem { get; set; }
+
+        public Guid FK_ItemId { get; set; }
+        [ForeignKey("FK_ItemId")]
+        public Item Item { get; set; }
+
+        public int Quantity { get; set; }
+        public decimal UnitPrice { get; set; }
+        public bool IsRemoved { get; set; }
+    }
+}

Distribution/docs/refactor_docs/order_invoice_lifecycle.md

@@ -82,6 +82,89 @@ Invoice
 ├── IsActive, CreatedAt        — from Template
 ```
 
+### Invoice Line Items & Version History
+
+> **Implemented.** Class/column names follow the code: the PO is `ShopPO`/`ShopPOItem`, and the
+> invoice FK is `FK_ShopPOId` (not `FK_OrderId` as sketched above).
+
+The invoice no longer bills straight from the PO. It owns its own lines, and every change to them is
+snapshotted, so the original, printed and finalized quantities can all be compared.
+
+```
+InvoiceItem                          — the live billing lines
+├── FK_InvoiceId, FK_ShopPOItemId, FK_ItemId
+├── Quantity (int)                   — what is billed now (0..ShopPOItem.Quantity)
+├── UnitPrice (decimal)
+└── IsActive, CreatedAt              — from Template
+
+InvoiceVersion                       — immutable snapshot of the invoice
+├── FK_InvoiceId, VersionNumber      — unique per invoice, starts at 1
+├── Stage (InvoiceVersionStage)      — Created, DraftEdited, Printed, Finalized
+├── TotalAmount, CreatedBy
+└── Items → InvoiceVersionItem       — FK_ShopPOItemId, FK_ItemId, Quantity, UnitPrice
+```
+
+- **Add / remove lines (Draft):** `PUT /api/invoices/{id}/items` takes edits keyed by `invoiceItemId`
+  (change quantity/price, or `isRemoved: true` to strike the line — it is kept, excluded from the
+  total, shown struck through on the invoice view and print copy in every status, and can be
+  restored while Draft) or by `itemId` (add a catalog item
+  that was not on the PO; `unitPrice` required, quantity > 0, no duplicate of a live line). Added
+  lines have no `ShopPOItem` (`FK_ShopPOItemId` is nullable → no `orderedQuantity`, no max). Versions
+  store `IsRemoved` per line. At `Finalize`, adjustments are keyed by `invoiceItemId` and can also
+  set `isRemoved`. When the loading sheet is linked to invoices, it must count added lines.
+- **Original PO quantity** stays on `ShopPOItem.Quantity` (locked once the PO is confirmed) and is
+  returned as `orderedQuantity` on each invoice line.
+- `InvoiceItem` rows are copied from the PO's active lines at invoice creation (Mode A and Mode B).
+- A version is written, in the same transaction as the change, when the invoice is:
+
+| Stage | Written when |
+|---|---|
+| `Created` (v1) | Invoice created |
+| `DraftEdited` | `PUT /api/invoices/{id}/items` while `Draft` |
+| `Printed` | `POST /api/invoices/{id}/print` — the quantities on the paper copy |
+| `Finalized` | `POST /api/invoices/{id}/finalize` — after the agent's edits are applied |
+
+- Comparing `Printed` vs `Finalized` shows what the agent changed on paper.
+- Migrations `AddInvoiceItems` and `AddInvoiceVersions` backfill lines and one baseline version for
+  invoices that already existed (stage mapped from the invoice's status at migration time, so they
+  have no earlier history).
+
+### Invoice Screens & Printing (frontend)
+
+> **Implemented** in `distribution_fe`.
+
+**Invoice document** — one shared component (`components/invoice/invoice-template.tsx`) renders the
+invoice for the preview, the draft editor and the print tab:
+
+- **A4**: `INVOICE` header with Invoice No. (`INV-xxxxxxxx`), date and PO ref; a Status row shown
+  until the invoice is Finalized; *Bill To* (store name, plus address/phone from the PO); item table
+  (Item · Qty · Unit Price · Amount); totals (Subtotal, Total, and Paid / Balance Due when payments
+  exist); payments list; notes lines for the agent's edits on non-finalized copies; signature lines.
+  Soft slate rules, no heavy colour.
+- **80mm / 58mm receipts**: single black-and-white column with dashed rules (`*** DRAFT ***` /
+  `*** PRINTED ***`, `qty x price` lines, heavy-ruled TOTAL, Paid/Balance, payments, "Thank you!").
+- Money `Rs. 12,450.00`, quantities up to 3 decimals, dates `dd/MM/yyyy`.
+- Deleted lines are shown **struck through in every status** and excluded from all totals.
+- Not included (no data in the app): company/"From" block, logo, bank details, discount, tax, due date.
+
+**Print tab** — `/invoices/{id}/print` (own route group `(print)`, no dashboard chrome). Has a
+paper-size selector (A4 / 80mm / 58mm), sets `@page` with `margin: 0` (so the browser's own
+URL/date header and footer are not printed; the A4 sheet pads itself with 14mm), and opens the
+print dialog automatically. *Print* on a Draft asks who printed it, calls `POST /print`, then opens
+this tab (the tab is opened inside the click so popup blockers allow it). Printed/Finalized
+invoices have *Reprint*, which opens the tab without changing status.
+
+**Draft editor** — pencil icon (Draft only, also *Edit Items* on the invoice page) opens a full page, `/sales/invoices/{id}/edit` (not a modal), showing the invoice template in edit mode: quantity/price
+inputs, a trash icon per line (undo icon restores a deleted line), and an add-item row aligned to
+the table columns (item dropdown excluding items already on the invoice, quantity, price
+auto-filled from the store's price list, Enter or **+** to add). Save is disabled until something
+changes, a summary shows what is pending (the browser warns before leaving with unsaved edits), and an item picked but not yet added is included on save. Non-Draft invoices redirect back to the invoice page.
+Each save writes a `DraftEdited` version.
+
+**Configuration** — *Invoice Creation* card: two toggles, **Auto** (Mode A) and **Manual** (Mode B,
+default), mutually exclusive (turning one on turns the other off; the active one is locked on), each
+with a one-line explanation and a process line (`Confirm PO → … → Edit draft → Print → Finalize`).
+
 ### New Enum — `InvoiceStatus`
 
 ```csharp
@@ -140,6 +223,7 @@ Draft → Printed → Finalized
 |---|---|---|
 | (create) → Draft | **Mode A:** combined with PO confirm above | Invoice created at `Draft`. `Order.InvoiceId` set. |
 | (create) → Draft | **Mode B:** `POST /api/invoices` `{ orderId }` | Office user selects a Confirmed PO (filtered by `agentId` / `routeId` / `shopId`) and creates the Invoice at `Draft`. `Order.InvoiceId` set. |
+| Draft (edit) | `PUT /api/invoices/{id}/items` | Office user edits the draft's lines (quantity `0..ordered`, price `>= 0`). Status stays `Draft`; `TotalAmount` recomputed; a `DraftEdited` version is saved. |
 | Draft → Printed | `POST /api/invoices/{id}/print` | Invoice is physically printed. `PrintedAt`/`PrintedBy` set. Agent takes the printed copy to the field and makes handwritten edits during the ride. |
 | Printed → Finalized | `POST /api/invoices/{id}/finalize` | After ride/day-end, agent returns printed invoice. Office worker enters any edits the agent made (quantity adjustments, returns, damage, discounts) and submits. `TotalAmount` locked. `FinalizedAt`/`FinalizedBy` set. |
 
@@ -162,7 +246,10 @@ Draft → Printed → Finalized
    Invoice creation for both modes. It is stored as a plain column with no DB-level FK constraint.
 7. An Invoice cannot skip `Printed` — `Draft → Finalized` directly is not a valid transition.
 8. `Invoice.TotalAmount` is only authoritative once `Finalized`; through `Draft`/`Printed` it
-   reflects the current line items.
+   reflects the current invoice lines (`InvoiceItem`), not the PO lines.
+8a. Invoice lines are editable only while `Draft`. At `Finalize`, only quantities can be adjusted
+    (never above the ordered quantity). Every change writes an `InvoiceVersion` snapshot — see
+    [Invoice Line Items & Version History](#invoice-line-items--version-history).
 9. `Order.Status` (fulfillment tracking: Pending/PartiallyFulfilled/Fulfilled/Cancelled) is a
    separate axis from `Invoice.Status` — not merged in this pass.
 10. `Order.FK_SaleId` is optional — a PO can exist and be confirmed before any `Sale` is recorded.
@@ -201,8 +288,9 @@ Draft → Printed → Finalized
    already has a linked Invoice, what happens to that Invoice (voided? stays Draft?) is unresolved.
    If the PO's items were pulled into a loading sheet, what happens to those loading sheet items is
    also unresolved. Both cases need explicit cascade rules before implementation.
-6. **Exact adjustment payload for `POST /finalize`** — quantity adjustments, returns, damage, and
-   discounts are assumed but the payload shape is not fully specified. "Free issues" handling (items
+6. **Exact adjustment payload for `POST /finalize`** — *partly resolved:* quantity adjustments
+   (`{ shopPOItemId, adjustedQuantity }`) are implemented and persisted on the invoice lines.
+   Returns, damage and discounts are still open, as is the payload shape for them. "Free issues" handling (items
    given to the shop at no charge) is a known case that needs its own field(s) in the payload.
 
 ---

Distribution/docs/refactor_docs/shop_po_invoice_operations_flow.md

@@ -35,10 +35,28 @@ status transition and stock movement along the way.
 
 - Created via `ShopPOService.ConfirmAndCreateInvoiceAsync` — confirms the PO **and** creates an
   `Invoice` (`Status: Draft`, `PaymentStatus: Pending`) in one step, linking `ShopPO.InvoiceId`.
-  (No frontend UI currently calls this endpoint — only the plain `Confirm` action is wired up.)
+  The frontend calls it when **Configuration → Invoice Creation** is set to **Auto** (Mode A, the
+  confirm dialog and PO edit page read the mode); with **Manual** (Mode B, the default) it calls the
+  plain `Confirm` and the invoice is created later from `/sales/orders` → **Create Invoice**.
 - Lifecycle: `Draft → Printed → Finalized`.
-  - Finalizing can adjust the billed quantity per line (capped between `0` and the ordered
-    quantity) and recomputes `TotalAmount` from the adjusted lines.
+  - The invoice has its own lines (`InvoiceItem`), copied from the PO's active lines when it is
+    created (either mode). The PO's original quantity stays on `ShopPOItem` and is shown as
+    `orderedQuantity`.
+  - While `Draft`, lines can be edited (`PUT /invoices/{id}/items`): change quantity (`0..ordered`
+    on PO lines) and price (`>= 0`), **delete** a line (it is kept, struck through, excluded from
+    the total, and can be restored), or **add** a catalog item that was not on the PO (no ordered
+    quantity / max). `TotalAmount` is recomputed from the non-deleted lines.
+  - Finalizing applies the agent's edits from the printed copy to the lines (quantity capped
+    between `0` and the ordered quantity, or a line removed) and recomputes `TotalAmount`.
+  - Every change is snapshotted as an `InvoiceVersion` — see
+    [refactor_docs/order_invoice_lifecycle.md](refactor_docs/order_invoice_lifecycle.md#invoice-line-items--version-history).
+  - Frontend, `/sales/orders` row icons: **eye** = invoice preview, **pencil** (Draft) = open the edit page for the
+    draft invoice (`/sales/invoices/[id]/edit`: trash/undo icon per line, add-item row), **printer** (Draft) =
+    mark as printed and open the print tab; on Printed/Finalized the printer reprints without
+    changing status; plus finalize and record payment. `/sales/invoices/[id]` shows the items table
+    (ordered vs billed, Added/Removed badges), the version history, and the same actions.
+  - Invoice document and print tab: see
+    [refactor_docs/order_invoice_lifecycle.md](refactor_docs/order_invoice_lifecycle.md#invoice-screens--printing-frontend).
 - Payments (`payments` API) apply against the invoice, moving `PaymentStatus`:
   `Pending → PartiallyPaid → Paid`.
 

distribution_fe/app/(dashboard)/configuration/_components/invoice-creation-mode-card.tsx

@@ -4,8 +4,7 @@ import { useEffect, useState } from 'react'
 import { HugeiconsIcon } from '@hugeicons/react'
 import { ReceiptDollarIcon } from '@hugeicons/core-free-icons'
 import { Card, CardContent, CardHeader, CardTitle, CardDescription } from '@/components/ui/card'
-import { ToggleGroup, ToggleGroupItem } from '@/components/ui/toggle-group'
-import { FieldDescription } from '@/components/ui/field'
+import { Switch } from '@/components/ui/switch'
 import { toast } from '@/components/ui/toast'
 import {
   invoiceCreationMode as invoiceCreationModeApi,
@@ -14,15 +13,11 @@ import {
 } from '@/lib/api/index'
 import type { InvoiceCreationMode } from '@/lib/api/sys-config'
 
-const MODE_LABELS: Record<InvoiceCreationMode, string> = {
-  ModeA: 'Auto on confirm',
-  ModeB: 'Separate step',
-}
-
-const MODE_HINTS: Record<InvoiceCreationMode, string> = {
-  ModeA: 'Confirming a Shop PO immediately creates a draft invoice.',
-  ModeB: 'Confirmation and invoice creation are two distinct actions.',
-}
+// What each toggle stands for. Both end the same way: edit the draft, print, finalize.
+const POSITIONS: { mode: InvoiceCreationMode; label: string; meaning: string; steps: string[] }[] = [
+  { mode: 'ModeA', label: 'Auto', meaning: 'Confirming a PO also creates its draft invoice.', steps: ['Confirm PO', 'Draft created'] },
+  { mode: 'ModeB', label: 'Manual', meaning: 'Confirm first, then create the invoice yourself.', steps: ['Confirm PO', 'Create invoice'] },
+]
 
 export function InvoiceCreationModeCard() {
   const [loading, setLoading] = useState(true)
@@ -66,18 +61,34 @@ export function InvoiceCreationModeCard() {
           </div>
         </div>
       </CardHeader>
-      <CardContent className="flex flex-col gap-2.5">
-        <ToggleGroup
-          variant="outline"
-          value={[mode]}
-          onValueChange={(v: string[]) => v[0] && save(v[0] as InvoiceCreationMode)}
-          disabled={pending}
-          className="w-full"
-        >
-          <ToggleGroupItem value="ModeA" className="flex-1">{MODE_LABELS.ModeA}</ToggleGroupItem>
-          <ToggleGroupItem value="ModeB" className="flex-1">{MODE_LABELS.ModeB}</ToggleGroupItem>
-        </ToggleGroup>
-        <FieldDescription className="text-xs leading-relaxed">{MODE_HINTS[mode]}</FieldDescription>
+      <CardContent className="flex flex-col gap-3">
+        {POSITIONS.map((p) => {
+          const active = p.mode === mode
+          return (
+            <div
+              key={p.mode}
+              className={`flex items-center justify-between gap-3 rounded-xl border px-3 py-2.5 ${
+                active ? 'border-primary/40 bg-muted' : 'border-border/60'
+              }`}
+            >
+              <label htmlFor={`invoice-creation-${p.mode}`} className="flex flex-col gap-0.5">
+                <span className="text-sm font-medium">{p.label}</span>
+                <span className="text-xs leading-relaxed text-muted-foreground">{p.meaning}</span>
+              </label>
+              {/* One mode is always on: turning one on turns the other off; the active one cannot be switched off. */}
+              <Switch
+                id={`invoice-creation-${p.mode}`}
+                checked={active}
+                disabled={pending || active}
+                onCheckedChange={(v) => v && save(p.mode)}
+              />
+            </div>
+          )
+        })}
+
+        <p className="text-xs text-muted-foreground">
+          {[...(POSITIONS.find((p) => p.mode === mode)?.steps ?? []), 'Edit draft', 'Print', 'Finalize'].join(' → ')}
+        </p>
       </CardContent>
     </Card>
   )

distribution_fe/app/(dashboard)/sales/invoices/[id]/edit/page.tsx

@@ -0,0 +1,342 @@
+'use client'
+
+import { useEffect, useMemo, useState } from 'react'
+import { useParams, useRouter } from 'next/navigation'
+import { HugeiconsIcon } from '@hugeicons/react'
+import { Add01Icon, ArrowLeft01Icon, Delete02Icon, Undo02Icon } from '@hugeicons/core-free-icons'
+import { Badge } from '@/components/ui/badge'
+import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from '@/components/ui/select'
+import { InvoiceTemplate } from '@/components/invoice/invoice-template'
+import { toast } from '@/components/ui/toast'
+import {
+  invoices as invoicesApi,
+  users as usersApi,
+  items as itemsApi,
+  priceLists as priceListsApi,
+  getApiError,
+  getPaginatedItems,
+} from '@/lib/api/index'
+import type { InvoiceItemResponse, InvoiceResponse, ItemSummaryResponse, UserResponse } from '@/types/api'
+
+interface AddedLine {
+  key: string
+  itemId: string
+  name: string
+  qty: string
+  price: string
+}
+
+const NEW_PREFIX = 'new:'
+const isNew = (item: InvoiceItemResponse) => item.id.startsWith(NEW_PREFIX)
+const addedKey = (item: InvoiceItemResponse) => item.id.slice(NEW_PREFIX.length)
+
+// Full-page editor for a Draft invoice, on the invoice template: change quantity/price, delete (strike)
+// lines and add items that were not on the PO. Each save is recorded as a new invoice version.
+export default function InvoiceEditPage() {
+  const router = useRouter()
+  const params = useParams<{ id: string }>()
+  const invoiceId = params.id
+  const backToInvoice = () => router.push(`/sales/invoices/${invoiceId}`)
+
+  const [full, setFull] = useState<InvoiceResponse | null>(null)
+  const [loading, setLoading] = useState(true)
+  const [qty, setQty] = useState<Record<string, string>>({})
+  const [price, setPrice] = useState<Record<string, string>>({})
+  const [removed, setRemoved] = useState<Record<string, boolean>>({})
+  const [added, setAdded] = useState<AddedLine[]>([])
+  const [catalogue, setCatalogue] = useState<ItemSummaryResponse[]>([])
+  const [pickItemId, setPickItemId] = useState('')
+  const [pickQty, setPickQty] = useState('1')
+  const [pickPrice, setPickPrice] = useState('')
+  const [userId, setUserId] = useState('')
+  const [usersList, setUsersList] = useState<UserResponse[]>([])
+  const [saving, setSaving] = useState(false)
+
+  useEffect(() => {
+    invoicesApi.get(invoiceId)
+      .then((inv) => {
+        if (inv.status !== 'Draft') {
+          toast.add({ title: 'Only Draft invoices can be edited', type: 'error' })
+          router.replace(`/sales/invoices/${invoiceId}`)
+          return
+        }
+        setFull(inv)
+        setQty(Object.fromEntries(inv.items.map((i) => [i.id, String(i.quantity)])))
+        setPrice(Object.fromEntries(inv.items.map((i) => [i.id, String(i.unitPrice)])))
+        setRemoved(Object.fromEntries(inv.items.map((i) => [i.id, i.isRemoved])))
+      })
+      .catch((err) => {
+        toast.add({ title: 'Failed to load invoice', description: getApiError(err), type: 'error' })
+        router.push('/sales/orders')
+      })
+      .finally(() => setLoading(false))
+    usersApi.list()
+      .then(setUsersList)
+      .catch((err) => toast.add({ title: 'Failed to load users', description: getApiError(err), type: 'error' }))
+    itemsApi.list({ pageSize: 200 })
+      .then((res) => setCatalogue(getPaginatedItems(res)))
+      .catch((err) => toast.add({ title: 'Failed to load items', description: getApiError(err), type: 'error' }))
+  }, [invoiceId, router])
+
+  // The template renders this copy so line amounts and the total follow what is typed.
+  const live = useMemo<InvoiceResponse | null>(() => {
+    if (!full) return null
+    const existing = full.items.map((i) => ({
+      ...i,
+      quantity: Number(qty[i.id]) || 0,
+      unitPrice: Number(price[i.id]) || 0,
+      isRemoved: !!removed[i.id],
+    }))
+    const extra: InvoiceItemResponse[] = added.map((a) => ({
+      id: NEW_PREFIX + a.key,
+      shopPOItemId: null,
+      itemId: a.itemId,
+      itemName: a.name,
+      orderedQuantity: null,
+      quantity: Number(a.qty) || 0,
+      unitPrice: Number(a.price) || 0,
+      isRemoved: false,
+    }))
+    const items = [...existing, ...extra]
+    const totalAmount = items.filter((i) => !i.isRemoved).reduce((s, i) => s + i.quantity * i.unitPrice, 0)
+    return { ...full, items, totalAmount }
+  }, [full, qty, price, removed, added])
+
+  // Items not already on the invoice (a deleted line can be restored with Undo instead).
+  const availableItems = catalogue.filter((c) => !live?.items.some((i) => i.itemId === c.id))
+
+  // Picking an item fills in its price: the store's price list, falling back to the item's default price.
+  async function pickItem(itemId: string) {
+    setPickItemId(itemId)
+    const item = catalogue.find((c) => c.id === itemId)
+    if (!item || !full) return
+    setPickPrice(String(item.salePrice))
+    try {
+      const res = await priceListsApi.resolve({
+        itemId,
+        storeId: full.storeId,
+        saleDate: new Date().toISOString().slice(0, 10),
+      })
+      setPickPrice(String(res.price))
+    } catch {
+      // No price list entry for this store — keep the default price.
+    }
+  }
+
+  // The line currently typed into the add row, or null when nothing valid is picked.
+  function pendingLine(): AddedLine | null {
+    const item = catalogue.find((c) => c.id === pickItemId)
+    if (!item || !(Number(pickQty) > 0) || pickPrice === '' || Number(pickPrice) < 0) return null
+    return { key: crypto.randomUUID(), itemId: item.id, name: item.name, qty: pickQty, price: pickPrice }
+  }
+
+  function addItem() {
+    const line = pendingLine()
+    if (!line) {
+      toast.add({ title: 'Pick an item and enter a quantity above zero', type: 'error' })
+      return
+    }
+    setAdded((a) => [...a, line])
+    setPickItemId('')
+    setPickQty('1')
+    setPickPrice('')
+  }
+
+  const changeSummary = useMemo(() => {
+    if (!full) return []
+    const edited = full.items.filter(
+      (i) => !removed[i.id] && (Number(qty[i.id]) !== i.quantity || Number(price[i.id]) !== i.unitPrice),
+    ).length
+    const struck = full.items.filter((i) => !!removed[i.id] !== i.isRemoved).length
+    return [
+      added.length && `${added.length} added`,
+      struck && `${struck} removed/restored`,
+      edited && `${edited} edited`,
+    ].filter(Boolean) as string[]
+  }, [full, qty, price, removed, added])
+
+  const dirty = changeSummary.length > 0
+
+  // Warn before the tab is closed/reloaded with unsaved edits.
+  useEffect(() => {
+    if (!dirty) return
+    const warn = (e: BeforeUnloadEvent) => e.preventDefault()
+    window.addEventListener('beforeunload', warn)
+    return () => window.removeEventListener('beforeunload', warn)
+  }, [dirty])
+
+  async function save() {
+    if (!full) return
+    if (!userId) {
+      toast.add({ title: 'Select who is editing', type: 'error' })
+      return
+    }
+    // An item picked in the add row but not yet added is included, so it is not silently lost.
+    const pending = pendingLine()
+    const newLines = pending ? [...added, pending] : added
+    setSaving(true)
+    try {
+      await invoicesApi.updateItems(
+        full.id,
+        [
+          ...full.items.map((i) => ({
+            invoiceItemId: i.id,
+            quantity: Number(qty[i.id]),
+            unitPrice: Number(price[i.id]),
+            isRemoved: !!removed[i.id],
+          })),
+          ...newLines.map((a) => ({ itemId: a.itemId, quantity: Number(a.qty), unitPrice: Number(a.price) })),
+        ],
+        userId,
+      )
+      toast.add({ title: 'Invoice updated', type: 'success' })
+      // Navigating away right after a successful save; clear the unsaved-changes guard first.
+      setAdded([])
+      setQty(Object.fromEntries(full.items.map((i) => [i.id, String(i.quantity)])))
+      setPrice(Object.fromEntries(full.items.map((i) => [i.id, String(i.unitPrice)])))
+      setRemoved(Object.fromEntries(full.items.map((i) => [i.id, i.isRemoved])))
+      backToInvoice()
+    } catch (err) {
+      toast.add({ title: 'Failed to update invoice', description: getApiError(err), type: 'error' })
+    } finally {
+      setSaving(false)
+    }
+  }
+
+  return (
+    <div className="flex flex-col gap-6">
+      <div className="flex items-center justify-between gap-4">
+        <div className="flex items-center gap-4">
+          <Button type="button" variant="outline" size="sm" onClick={backToInvoice}>
+            <HugeiconsIcon icon={ArrowLeft01Icon} size={16} strokeWidth={2} />
+            Back
+          </Button>
+          <div>
+            <div className="flex items-center gap-2">
+              <h1 className="text-2xl font-semibold text-foreground">Edit Draft Invoice</h1>
+              {full && <Badge variant="secondary">{full.status}</Badge>}
+            </div>
+            <p className="text-sm text-muted-foreground">
+              Change quantities and prices, delete lines, or add items. Quantity on a PO line cannot exceed the
+              ordered quantity. Every save creates a new version.
+            </p>
+          </div>
+        </div>
+      </div>
+
+      {loading || !live ? (
+        <p className="text-sm text-muted-foreground">Loading invoice…</p>
+      ) : (
+        <>
+          <InvoiceTemplate
+            invoice={live}
+            renderQuantity={(item) => (
+              <Input
+                type="number" min={0} max={item.orderedQuantity ?? undefined}
+                className="ml-auto h-8 w-20 text-right"
+                value={isNew(item) ? added.find((a) => a.key === addedKey(item))?.qty ?? '' : qty[item.id] ?? ''}
+                onChange={(e) => isNew(item)
+                  ? setAdded((a) => a.map((l) => l.key === addedKey(item) ? { ...l, qty: e.target.value } : l))
+                  : setQty((q) => ({ ...q, [item.id]: e.target.value }))}
+              />
+            )}
+            renderUnitPrice={(item) => (
+              <Input
+                type="number" min={0} step="0.01"
+                className="ml-auto h-8 w-28 text-right"
+                value={isNew(item) ? added.find((a) => a.key === addedKey(item))?.price ?? '' : price[item.id] ?? ''}
+                onChange={(e) => isNew(item)
+                  ? setAdded((a) => a.map((l) => l.key === addedKey(item) ? { ...l, price: e.target.value } : l))
+                  : setPrice((p) => ({ ...p, [item.id]: e.target.value }))}
+              />
+            )}
+            renderActions={(item) => (
+              <Button
+                type="button" variant="ghost" size="icon-sm"
+                className={item.isRemoved ? 'text-muted-foreground' : 'text-destructive hover:text-destructive'}
+                aria-label={item.isRemoved ? 'Restore line' : 'Delete line'}
+                title={item.isRemoved ? 'Restore line' : 'Delete line'}
+                onClick={() => isNew(item)
+                  ? setAdded((a) => a.filter((l) => l.key !== addedKey(item)))
+                  : setRemoved((r) => ({ ...r, [item.id]: !r[item.id] }))}
+              >
+                <HugeiconsIcon icon={item.isRemoved ? Undo02Icon : Delete02Icon} size={16} />
+              </Button>
+            )}
+            footerRow={
+              // Cells line up with the table columns: Item · Qty · Unit Price · Amount · action.
+              <tr className="bg-neutral-50 print:hidden" onKeyDown={(e) => { if (e.key === 'Enter') { e.preventDefault(); addItem() } }}>
+                <td className="px-2 py-3">
+                  <Select value={pickItemId} onValueChange={(v) => pickItem(v ?? '')}>
+                    <SelectTrigger className="h-8 w-full"><SelectValue placeholder="Add an item…" /></SelectTrigger>
+                    <SelectContent>
+                      {availableItems.length === 0
+                        ? <div className="px-3 py-2 text-sm text-muted-foreground">No more items to add</div>
+                        : availableItems.map((c) => (
+                            <SelectItem key={c.id} value={c.id}>
+                              {c.name} <span className="text-muted-foreground">· {c.sku}</span>
+                            </SelectItem>
+                          ))}
+                    </SelectContent>
+                  </Select>
+                </td>
+                <td className="px-2 py-3">
+                  <Input
+                    type="number" min={1} aria-label="Quantity" className="ml-auto h-8 w-20 text-right"
+                    value={pickQty} onChange={(e) => setPickQty(e.target.value)}
+                  />
+                </td>
+                <td className="px-2 py-3">
+                  <Input
+                    type="number" min={0} step="0.01" aria-label="Unit price" placeholder="Price"
+                    className="ml-auto h-8 w-28 text-right"
+                    value={pickPrice} onChange={(e) => setPickPrice(e.target.value)}
+                  />
+                </td>
+                <td className="px-2 py-3 text-right text-sm text-neutral-500">
+                  {pickItemId ? ((Number(pickQty) || 0) * (Number(pickPrice) || 0)).toLocaleString('en-US', { minimumFractionDigits: 2 }) : ''}
+                </td>
+                <td className="px-2 py-3 text-right">
+                  <Button
+                    type="button" size="icon-sm" aria-label="Add item" title="Add item (Enter)"
+                    onClick={addItem} disabled={!pickItemId}
+                  >
+                    <HugeiconsIcon icon={Add01Icon} size={16} />
+                  </Button>
+                </td>
+              </tr>
+            }
+          />
+
+          <div className="mx-auto flex w-full max-w-[210mm] flex-wrap items-center justify-between gap-3">
+            <div className="w-64">
+              <Select value={userId} onValueChange={(v) => setUserId(v ?? '')}>
+                <SelectTrigger><SelectValue placeholder="Edited by (temporary)..." /></SelectTrigger>
+                <SelectContent>
+                  {usersList.map((u) => <SelectItem key={u.id} value={u.id}>{u.fullName}</SelectItem>)}
+                </SelectContent>
+              </Select>
+            </div>
+            <p className="text-xs text-muted-foreground">
+              {dirty ? `Unsaved: ${changeSummary.join(', ')}` : 'No changes yet'}
+            </p>
+            <div className="flex items-center gap-2">
+              <Button type="button" variant="outline" onClick={backToInvoice}>Cancel</Button>
+              <Button type="button" onClick={save} disabled={saving || (!dirty && !pendingLine())}>
+                {saving ? 'Saving…' : 'Save changes'}
+              </Button>
+            </div>
+          </div>
+        </>
+      )}
+    </div>
+  )
+}

distribution_fe/app/(dashboard)/sales/invoices/[id]/page.tsx

@@ -8,12 +8,19 @@ import { Badge } from '@/components/ui/badge'
 import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/toast'
 import { invoices as invoicesApi, payments as paymentsApi, getApiError } from '@/lib/api/index'
-import type { InvoiceResponse, InvoiceStatus, PaymentResponse, PaymentMethod, PaymentStatus } from '@/types/api'
+import type { InvoiceResponse, InvoiceStatus, InvoiceVersionResponse, PaymentResponse, PaymentMethod, PaymentStatus } from '@/types/api'
 
 import { PaymentSheet } from '../../payments/_components/payment-sheet'
 import { PaymentViewSheet } from '../../payments/_components/payment-view-sheet'
 import { InvoiceActionDialog } from '../../orders/_components/invoice-action-dialog'
 
+const STAGE_LABEL: Record<InvoiceVersionResponse['stage'], string> = {
+  Created: 'Created',
+  DraftEdited: 'Draft edited',
+  Printed: 'Printed',
+  Finalized: 'Finalized',
+}
+
 const INVOICE_STATUS_VARIANT: Record<InvoiceStatus, 'default' | 'secondary' | 'outline'> = {
   Draft: 'secondary',
   Printed: 'outline',
@@ -61,10 +68,12 @@ export default function InvoiceViewPage() {
   const [viewPayment, setViewPayment] = useState<PaymentResponse | null>(null)
   const [actionOpen, setActionOpen] = useState(false)
   const [actionMode, setActionMode] = useState<'print' | 'finalize'>('print')
+  const [versions, setVersions] = useState<InvoiceVersionResponse[]>([])
 
   const fetchInvoice = useCallback(async () => {
-    const inv = await invoicesApi.get(params.id)
+    const [inv, vers] = await Promise.all([invoicesApi.get(params.id), invoicesApi.versions(params.id)])
     setInvoice(inv)
+    setVersions(vers)
     return inv
   }, [params.id])
 
@@ -139,11 +148,21 @@ export default function InvoiceViewPage() {
         </div>
 
         <div className="flex items-center gap-2">
+          {invoice.status === 'Draft' && (
+            <Button type="button" variant="outline" onClick={() => router.push(`/sales/invoices/${invoice.id}/edit`)}>
+              Edit Items
+            </Button>
+          )}
           {invoice.status === 'Draft' && (
             <Button type="button" onClick={handlePrint}>
               Print Invoice
             </Button>
           )}
+          {invoice.status !== 'Draft' && (
+            <Button type="button" variant="outline" onClick={() => window.open(`/invoices/${invoice.id}/print`, '_blank')}>
+              Reprint
+            </Button>
+          )}
           {invoice.status === 'Printed' && (
             <Button type="button" onClick={handleFinalize}>
               Finalize Invoice
@@ -167,6 +186,84 @@ export default function InvoiceViewPage() {
         <Stat label="Finalized" value={fmtDateTime(invoice.finalizedAt)} />
       </div>
 
+      <div className="rounded-2xl border p-6">
+        <div className="mb-4">
+          <h3 className="text-sm font-medium text-foreground">Items</h3>
+          <p className="text-sm text-muted-foreground">Ordered quantity is the original PO; quantity is what is billed now.</p>
+        </div>
+        <div className="overflow-x-auto rounded-xl border">
+          <table className="w-full text-sm">
+            <thead className="bg-muted/50">
+              <tr>
+                <th className="px-3 py-2 text-left font-medium">Item</th>
+                <th className="w-24 px-3 py-2 text-right font-medium">Ordered</th>
+                <th className="w-24 px-3 py-2 text-right font-medium">Billed</th>
+                <th className="w-28 px-3 py-2 text-right font-medium">Unit price</th>
+                <th className="w-32 px-3 py-2 text-right font-medium">Line total</th>
+              </tr>
+            </thead>
+            <tbody>
+              {invoice.items.length === 0 ? (
+                <tr>
+                  <td colSpan={5} className="px-3 py-4 text-center text-muted-foreground">No items.</td>
+                </tr>
+              ) : (
+                invoice.items.map((i) => (
+                  <tr key={i.id} className={`border-t ${i.isRemoved ? 'text-muted-foreground line-through' : ''}`}>
+                    <td className="px-3 py-2">
+                      {i.itemName}
+                      {i.orderedQuantity === null && <Badge variant="outline" className="ml-2 no-underline">Added</Badge>}
+                      {i.isRemoved && <Badge variant="secondary" className="ml-2 no-underline">Removed</Badge>}
+                    </td>
+                    <td className="px-3 py-2 text-right">{i.orderedQuantity ?? '—'}</td>
+                    <td className={`px-3 py-2 text-right ${!i.isRemoved && i.quantity !== i.orderedQuantity ? 'font-medium text-destructive' : ''}`}>
+                      {i.quantity}
+                    </td>
+                    <td className="px-3 py-2 text-right">{fmtAmount(i.unitPrice)}</td>
+                    <td className="px-3 py-2 text-right font-medium">{i.isRemoved ? '—' : fmtAmount(i.quantity * i.unitPrice)}</td>
+                  </tr>
+                ))
+              )}
+            </tbody>
+          </table>
+        </div>
+      </div>
+
+      <div className="rounded-2xl border p-6">
+        <div className="mb-4">
+          <h3 className="text-sm font-medium text-foreground">Version history</h3>
+          <p className="text-sm text-muted-foreground">
+            Quantities after each change, so you can compare the original, printed and finalized copies.
+          </p>
+        </div>
+        <div className="overflow-x-auto rounded-xl border">
+          <table className="w-full text-sm">
+            <thead className="bg-muted/50">
+              <tr>
+                <th className="w-16 px-3 py-2 text-left font-medium">Version</th>
+                <th className="w-32 px-3 py-2 text-left font-medium">Stage</th>
+                <th className="w-40 px-3 py-2 text-left font-medium">When</th>
+                <th className="px-3 py-2 text-left font-medium">Quantities</th>
+                <th className="w-32 px-3 py-2 text-right font-medium">Total</th>
+              </tr>
+            </thead>
+            <tbody>
+              {versions.map((v) => (
+                <tr key={v.id} className="border-t align-top">
+                  <td className="px-3 py-2 font-mono">v{v.versionNumber}</td>
+                  <td className="px-3 py-2"><Badge variant="outline">{STAGE_LABEL[v.stage]}</Badge></td>
+                  <td className="px-3 py-2">{fmtDateTime(v.createdAt)}</td>
+                  <td className="px-3 py-2">
+                    {v.items.map((i) => (i.isRemoved ? `${i.itemName} (removed)` : `${i.itemName} × ${i.quantity}`)).join(', ') || '—'}
+                  </td>
+                  <td className="px-3 py-2 text-right font-medium">{fmtAmount(v.totalAmount)}</td>
+                </tr>
+              ))}
+            </tbody>
+          </table>
+        </div>
+      </div>
+
       <div className="rounded-2xl border p-6">
         <div className="mb-4">
           <h3 className="text-sm font-medium text-foreground">Payments</h3>

distribution_fe/app/(dashboard)/sales/orders/_components/invoice-action-dialog.tsx

@@ -21,6 +21,7 @@ import {
 } from '@/components/ui/dialog'
 import { FieldGroup } from '@/components/ui/field'
 import { toast } from '@/components/ui/toast'
+import { Input } from '@/components/ui/input'
 import { invoices as invoicesApi, users as usersApi, getApiError, getPaginatedItems } from '@/lib/api/index'
 import type { InvoiceResponse, UserResponse } from '@/types/api'
 
@@ -39,13 +40,17 @@ interface InvoiceActionDialogProps {
 }
 
 const COPY = {
-  print: { title: 'Mark Invoice as Printed', label: 'Printed By', action: 'Mark as Printed', success: 'Invoice marked as printed' },
+  print: { title: 'Print Invoice', label: 'Printed By', action: 'Print Invoice', success: 'Invoice printed' },
   finalize: { title: 'Finalize Invoice', label: 'Finalized By', action: 'Finalize Invoice', success: 'Invoice finalized' },
 }
 
 export function InvoiceActionDialog({ open, onClose, onSuccess, invoice, mode }: InvoiceActionDialogProps) {
   const [usersList, setUsersList] = useState<UserResponse[]>([])
   const copy = COPY[mode]
+  const [qty, setQty] = useState<Record<string, string>>({})
+  const [removed, setRemoved] = useState<Record<string, boolean>>({})
+  // Rows from the list endpoint carry no line items, so the full invoice is loaded for the finalize table.
+  const [full, setFull] = useState<InvoiceResponse | null>(null)
 
   const form = useForm<FormValues>({
     resolver: zodResolver(schema),
@@ -55,6 +60,18 @@ export function InvoiceActionDialog({ open, onClose, onSuccess, invoice, mode }:
   useEffect(() => {
     if (!open) return
     form.reset({ userId: '' })
+    setFull(null)
+    setQty({})
+    setRemoved({})
+    if (invoice) {
+      invoicesApi.get(invoice.id)
+        .then((inv) => {
+          setFull(inv)
+          setQty(Object.fromEntries(inv.items.map((i) => [i.id, String(i.quantity)])))
+          setRemoved(Object.fromEntries(inv.items.map((i) => [i.id, i.isRemoved])))
+        })
+        .catch((err) => toast.add({ title: 'Failed to load invoice', description: getApiError(err), type: 'error' }))
+    }
     usersApi.list()
       .then((res) => setUsersList(res))
       .catch((err) => toast.add({ title: 'Failed to load users', description: getApiError(err), type: 'error' }))
@@ -62,21 +79,35 @@ export function InvoiceActionDialog({ open, onClose, onSuccess, invoice, mode }:
 
   if (!invoice) return null
 
+  const lines = full?.items ?? []
+
   async function onSubmit(values: FormValues) {
+    // Opened synchronously, while the click still counts as a user gesture, so the browser allows the new tab.
+    const printTab = mode === 'print' ? window.open('', '_blank') : null
     try {
-      if (mode === 'print') await invoicesApi.print(invoice!.id, values.userId)
-      else await invoicesApi.finalize(invoice!.id, values.userId)
+      if (mode === 'print') {
+        await invoicesApi.print(invoice!.id, values.userId)
+        if (printTab) printTab.location.href = `/invoices/${invoice!.id}/print`
+      } else {
+        if (!full) throw new Error('Invoice is still loading')
+        // Only lines the agent changed on the printed copy are sent as adjustments.
+        const adjustments = lines
+          .filter((i) => Number(qty[i.id]) !== i.quantity || !!removed[i.id] !== i.isRemoved)
+          .map((i) => ({ invoiceItemId: i.id, adjustedQuantity: Number(qty[i.id]), isRemoved: !!removed[i.id] }))
+        await invoicesApi.finalize(invoice!.id, values.userId, adjustments)
+      }
       toast.add({ title: copy.success, type: 'success' })
       onSuccess()
       onClose()
     } catch (err) {
+      printTab?.close()
       toast.add({ title: `Failed to ${mode} invoice`, description: getApiError(err), type: 'error' })
     }
   }
 
   return (
     <Dialog open={open} onOpenChange={(v) => { if (!v) onClose() }}>
-      <DialogContent className="sm:max-w-md">
+      <DialogContent className="sm:max-w-xl">
         <DialogHeader>
           <DialogTitle>{copy.title}</DialogTitle>
           <DialogDescription>{invoice.storeName} — Rs. {invoice.totalAmount.toLocaleString()}</DialogDescription>
@@ -106,6 +137,45 @@ export function InvoiceActionDialog({ open, onClose, onSuccess, invoice, mode }:
             />
           </FieldGroup>
 
+          {mode === 'finalize' && lines.length > 0 && (
+            <div className="flex flex-col gap-2">
+              <p className="text-sm font-medium">Edits from the printed copy</p>
+              <div className="overflow-x-auto rounded-xl border">
+                <table className="w-full text-sm">
+                  <thead className="bg-muted/50">
+                    <tr>
+                      <th className="px-3 py-2 text-left font-medium">Item</th>
+                      <th className="w-20 px-3 py-2 text-right font-medium">Printed</th>
+                      <th className="w-24 px-3 py-2 text-right font-medium">Final qty</th>
+                      <th className="w-24 px-3 py-2" />
+                    </tr>
+                  </thead>
+                  <tbody>
+                    {lines.map((i) => (
+                      <tr key={i.id} className={`border-t ${removed[i.id] ? "text-muted-foreground line-through" : ""}`}>
+                        <td className="px-3 py-2">{i.itemName}</td>
+                        <td className="px-3 py-2 text-right">{i.quantity}</td>
+                        <td className="px-3 py-2">
+                          <Input
+                            type="number" min={0} max={i.orderedQuantity ?? undefined} disabled={!!removed[i.id]}
+                            className="h-8 text-right"
+                            value={qty[i.id] ?? ''}
+                            onChange={(e) => setQty((q) => ({ ...q, [i.id]: e.target.value }))}
+                          />
+                        </td>
+                        <td className="px-3 py-2 text-right no-underline">
+                          <Button type="button" variant="ghost" size="sm" onClick={() => setRemoved((r) => ({ ...r, [i.id]: !r[i.id] }))}>
+                            {removed[i.id] ? 'Undo' : 'Remove'}
+                          </Button>
+                        </td>
+                      </tr>
+                    ))}
+                  </tbody>
+                </table>
+              </div>
+            </div>
+          )}
+
           <DialogFooter>
             <Button type="button" variant="outline" onClick={onClose}>Cancel</Button>
             <Button type="submit" disabled={form.formState.isSubmitting}>

distribution_fe/app/(dashboard)/sales/orders/_components/order-view-sheet.tsx

@@ -1,35 +1,15 @@
 'use client'
 
-import { Badge } from '@/components/ui/badge'
+import { Button } from '@/components/ui/button'
 import {
   Dialog,
   DialogContent,
   DialogHeader,
   DialogTitle,
 } from '@/components/ui/dialog'
-import type { InvoiceResponse, InvoiceStatus, PaymentStatus } from '@/types/api'
-
-const INVOICE_STATUS_VARIANT: Record<InvoiceStatus, 'default' | 'secondary' | 'destructive'> = {
-  Draft: 'secondary',
-  Printed: 'secondary',
-  Finalized: 'default',
-}
-
-const PAYMENT_STATUS_VARIANT: Record<PaymentStatus, 'default' | 'secondary' | 'destructive'> = {
-  Pending: 'secondary',
-  PartiallyPaid: 'secondary',
-  Paid: 'default',
-}
-
-const fmtAmount = (n: number) => `Rs. ${n.toLocaleString()}`
-const truncId = (id: string) => id.substring(0, 8)
-
-const fmtDateTime = (v: string | null) =>
-  v
-    ? new Date(v).toLocaleString('en-GB', {
-        day: '2-digit', month: 'short', year: 'numeric', hour: '2-digit', minute: '2-digit',
-      })
-    : '—'
+import { InvoiceTemplate } from '@/components/invoice/invoice-template'
+import { useInvoiceDocument } from '@/components/invoice/use-invoice-document'
+import type { InvoiceResponse } from '@/types/api'
 
 interface OrderViewSheetProps {
   open: boolean
@@ -37,36 +17,34 @@ interface OrderViewSheetProps {
   invoice: InvoiceResponse | null
 }
 
-function Row({ label, value }: { label: string; value: React.ReactNode }) {
-  return (
-    <div className="flex items-center justify-between py-2 text-sm border-b last:border-0">
-      <span className="text-muted-foreground">{label}</span>
-      <span className="font-medium text-right">{value}</span>
-    </div>
-  )
-}
-
+// Previews the invoice as the printed document. The list rows carry no line items, so the full invoice is fetched.
 export function OrderViewSheet({ open, onClose, invoice }: OrderViewSheetProps) {
+  const doc = useInvoiceDocument(invoice?.id, open)
+
   if (!invoice) return null
 
   return (
     <Dialog open={open} onOpenChange={(v) => !v && onClose()}>
-      <DialogContent className="overflow-y-auto sm:max-w-lg">
+      <DialogContent className="max-h-[90vh] overflow-y-auto sm:max-w-4xl">
         <DialogHeader>
-          <DialogTitle>Invoice Details</DialogTitle>
+          <DialogTitle>Invoice Preview</DialogTitle>
         </DialogHeader>
 
-        <div className="flex flex-col">
-          <Row label="Invoice ID" value={<span className="font-mono">{truncId(invoice.id)}</span>} />
-          <Row label="Shop PO" value={<span className="font-mono">{truncId(invoice.shopPOId)}</span>} />
-          <Row label="Store" value={invoice.storeName} />
-          <Row label="Status" value={<Badge variant={INVOICE_STATUS_VARIANT[invoice.status]}>{invoice.status}</Badge>} />
-          <Row label="Payment" value={<Badge variant={PAYMENT_STATUS_VARIANT[invoice.paymentStatus]}>{invoice.paymentStatus}</Badge>} />
-          <Row label="Total Amount" value={fmtAmount(invoice.totalAmount)} />
-          <Row label="Printed At" value={fmtDateTime(invoice.printedAt)} />
-          <Row label="Finalized At" value={fmtDateTime(invoice.finalizedAt)} />
-          <Row label="Created At" value={fmtDateTime(invoice.createdAt)} />
-        </div>
+        {doc.invoice ? (
+          <InvoiceTemplate invoice={doc.invoice} payments={doc.payments} customer={doc.customer} />
+        ) : (
+          <p className="py-10 text-center text-sm text-muted-foreground">
+            {doc.error ? `Failed to load invoice: ${doc.error}` : 'Loading invoice…'}
+          </p>
+        )}
+
+        {doc.invoice && doc.invoice.status !== 'Draft' && (
+          <div className="flex justify-end">
+            <Button type="button" variant="outline" onClick={() => window.open(`/invoices/${doc.invoice!.id}/print`, '_blank')}>
+              Open print view
+            </Button>
+          </div>
+        )}
       </DialogContent>
     </Dialog>
   )

distribution_fe/app/(dashboard)/sales/orders/_components/orders-client.tsx

@@ -1,6 +1,7 @@
 'use client'
 
 import { useState, useEffect, useCallback, useMemo } from 'react'
+import { useRouter } from 'next/navigation'
 
 import { DataTable } from '@/components/shared/data-table'
 import type { TableConfig } from '@/components/shared/data-table'
@@ -35,6 +36,7 @@ const PAYMENT_STATUS_VARIANT: Record<PaymentStatus, 'default' | 'secondary' | 'd
 }
 
 export function OrdersClient() {
+  const router = useRouter()
   const [data, setData] = useState<InvoiceResponse[]>([])
   const [loading, setLoading] = useState(true)
   const [total, setTotal] = useState(0)
@@ -76,6 +78,10 @@ export function OrdersClient() {
     setViewOpen(true)
   }
 
+  function handleEdit(row: InvoiceResponse) {
+    router.push(`/sales/invoices/${row.id}/edit`)
+  }
+
   function handlePrint(row: InvoiceResponse) {
     setSelectedInvoice(row)
     setActionMode('print')
@@ -156,12 +162,24 @@ export function OrdersClient() {
           label: 'View invoice',
           onClick: handleView,
         },
+        {
+          action: 'edit',
+          label: 'Edit draft items',
+          onClick: handleEdit,
+          visible: (target) => target.status === 'Draft',
+        },
         {
           action: 'print',
-          label: 'Mark as printed',
+          label: 'Print invoice',
           onClick: handlePrint,
           visible: (target) => target.status === 'Draft',
         },
+        {
+          action: 'print',
+          label: 'Reprint invoice',
+          onClick: (target) => window.open(`/invoices/${target.id}/print`, '_blank'),
+          visible: (target) => target.status !== 'Draft',
+        },
         {
           action: 'finalize',
           label: 'Finalize invoice',

distribution_fe/app/(print)/invoices/[id]/print/page.tsx

@@ -0,0 +1,68 @@
+'use client'
+
+import { useEffect, useState } from 'react'
+import { useParams } from 'next/navigation'
+import { Button } from '@/components/ui/button'
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from '@/components/ui/select'
+import { InvoiceTemplate, type InvoicePaper } from '@/components/invoice/invoice-template'
+import { useInvoiceDocument } from '@/components/invoice/use-invoice-document'
+
+// Browser page rule per paper size. Receipts are one continuous strip (auto height). Margin is 0 so the
+// browser has no margin area to print its own header/footer (page title, URL, date) into; the sheet pads itself.
+const PAGE_RULE: Record<InvoicePaper, string> = {
+  A4: '@page { size: A4; margin: 0; }',
+  '80mm': '@page { size: 80mm auto; margin: 0; }',
+  '58mm': '@page { size: 58mm auto; margin: 0; }',
+}
+
+// Standalone printable invoice (no dashboard chrome). Opened in a new tab after "Print".
+export default function InvoicePrintPage() {
+  const params = useParams<{ id: string }>()
+  const { invoice, payments, customer, error } = useInvoiceDocument(params.id)
+  const [paper, setPaper] = useState<InvoicePaper>('A4')
+
+  // Open the browser print dialog once, when the invoice first appears.
+  useEffect(() => {
+    if (!invoice) return
+    const t = setTimeout(() => window.print(), 600)
+    return () => clearTimeout(t)
+  }, [invoice])
+
+  if (error) return <p className="p-8 text-sm text-destructive">Failed to load invoice: {error}</p>
+  if (!invoice) return <p className="p-8 text-sm text-muted-foreground">Loading invoice…</p>
+
+  return (
+    <div className="mx-auto max-w-4xl p-6 print:max-w-none print:p-0">
+      <style>{`${PAGE_RULE[paper]} @media print { html, body { background: #fff !important; } }`}</style>
+
+      <div className="mb-4 flex items-center justify-end gap-2 print:hidden">
+        <div className="w-32">
+          <Select value={paper} onValueChange={(v) => setPaper((v as InvoicePaper) ?? 'A4')}>
+            <SelectTrigger><SelectValue placeholder="Paper size" /></SelectTrigger>
+            <SelectContent>
+              <SelectItem value="A4">A4</SelectItem>
+              <SelectItem value="80mm">80mm receipt</SelectItem>
+              <SelectItem value="58mm">58mm receipt</SelectItem>
+            </SelectContent>
+          </Select>
+        </div>
+        <Button type="button" variant="outline" onClick={() => window.close()}>Close</Button>
+        <Button type="button" onClick={() => window.print()}>Print</Button>
+      </div>
+
+      <InvoiceTemplate
+        invoice={invoice}
+        payments={payments}
+        customer={customer}
+        paper={paper}
+        showAgentEdits={invoice.status !== 'Finalized'}
+      />
+    </div>
+  )
+}

distribution_fe/components/invoice/invoice-format.ts

@@ -0,0 +1,19 @@
+// Shared number/date formatting for printed invoices.
+
+/** `Rs. 12,450.00` — thousands separator, exactly 2 decimals. */
+export const fmtMoney = (n: number) =>
+  `Rs. ${n.toLocaleString('en-US', { minimumFractionDigits: 2, maximumFractionDigits: 2 })}`
+
+/** Quantity: up to 3 decimals, trailing zeros dropped. */
+export const fmtQty = (n: number) => n.toLocaleString('en-US', { maximumFractionDigits: 3 })
+
+/** `dd/MM/yyyy` */
+export function fmtDate(v: string | null | undefined) {
+  if (!v) return '—'
+  const d = new Date(v)
+  const dd = String(d.getDate()).padStart(2, '0')
+  const mm = String(d.getMonth() + 1).padStart(2, '0')
+  return `${dd}/${mm}/${d.getFullYear()}`
+}
+
+export const invoiceNo = (id: string) => `INV-${id.substring(0, 8).toUpperCase()}`

distribution_fe/components/invoice/invoice-template.tsx

@@ -0,0 +1,304 @@
+import type { ReactNode } from 'react'
+import { cn } from '@/lib/utils'
+import type { InvoiceItemResponse, InvoiceResponse, PaymentResponse } from '@/types/api'
+import { fmtDate, fmtMoney, fmtQty, invoiceNo } from './invoice-format'
+
+export type InvoicePaper = 'A4' | '80mm' | '58mm'
+
+export interface InvoiceCustomer {
+  address?: string | null
+  phone?: string | null
+}
+
+interface InvoiceTemplateProps {
+  invoice: InvoiceResponse
+  payments?: PaymentResponse[]
+  customer?: InvoiceCustomer
+  paper?: InvoicePaper
+  // Draft-editor hooks (A4 only): inputs in the qty / price cells, a per-row action, and an extra table row.
+  renderQuantity?: (item: InvoiceItemResponse) => ReactNode
+  renderUnitPrice?: (item: InvoiceItemResponse) => ReactNode
+  renderActions?: (item: InvoiceItemResponse) => ReactNode
+  footerRow?: ReactNode
+  // Blank lines for the agent's handwritten edits on the paper copy.
+  showAgentEdits?: boolean
+  className?: string
+}
+
+// Soft slate palette: light rules, muted section headings.
+const RULE = '#cbd5e1'
+const HEADING = '#64748b'
+
+const statusLabel = (invoice: InvoiceResponse) =>
+  invoice.status === 'Finalized' ? null : invoice.status.toUpperCase()
+
+// Removed lines stay on the document (struck through) but are excluded from every total.
+function totals(invoice: InvoiceResponse, payments: PaymentResponse[]) {
+  const total = invoice.items.filter((i) => !i.isRemoved).reduce((s, i) => s + i.quantity * i.unitPrice, 0)
+  const paid = payments.reduce((s, p) => s + p.amount, 0)
+  return { total, paid, balance: total - paid }
+}
+
+export function InvoiceTemplate({ paper = 'A4', ...props }: InvoiceTemplateProps) {
+  return paper === 'A4' ? <A4Sheet {...props} /> : <ReceiptSheet {...props} paper={paper} />
+}
+
+// ─── A4 ───────────────────────────────────────────────────────────────────────
+
+function A4Sheet({
+  invoice,
+  payments = [],
+  customer,
+  renderQuantity,
+  renderUnitPrice,
+  renderActions,
+  footerRow,
+  showAgentEdits,
+  className,
+}: Omit<InvoiceTemplateProps, 'paper'>) {
+  const { total, paid, balance } = totals(invoice, payments)
+  const status = statusLabel(invoice)
+  const hasRemoved = invoice.items.some((i) => i.isRemoved)
+
+  return (
+    <div
+      className={cn(
+        'invoice-sheet relative mx-auto w-full max-w-[210mm] rounded-lg border bg-white p-10 text-sm leading-relaxed text-neutral-900 shadow-sm',
+        'print:max-w-none print:rounded-none print:border-0 print:p-[14mm] print:shadow-none',
+        className,
+      )}
+    >
+      {/* Header */}
+      <div className="flex items-start justify-between gap-6 border-b pb-5" style={{ borderColor: RULE }}>
+        <h2 className="text-4xl font-bold tracking-wide">INVOICE</h2>
+        <dl className="grid grid-cols-[auto_auto] gap-x-6 gap-y-1 text-right text-sm">
+          <dt className="text-neutral-500">Invoice No.</dt>
+          <dd className="font-mono font-semibold">{invoiceNo(invoice.id)}</dd>
+          <dt className="text-neutral-500">Invoice Date</dt>
+          <dd>{fmtDate(invoice.createdAt)}</dd>
+          <dt className="text-neutral-500">PO Ref.</dt>
+          <dd className="font-mono">{invoice.shopPOId.substring(0, 8).toUpperCase()}</dd>
+          {status && (
+            <>
+              <dt className="text-neutral-500">Status</dt>
+              <dd className="font-semibold" style={{ color: HEADING }}>{status}</dd>
+            </>
+          )}
+        </dl>
+      </div>
+
+      {/* Bill to */}
+      <div className="mt-6">
+        <h3 className="mb-1 border-b pb-1 text-xs font-semibold uppercase tracking-widest" style={{ borderColor: RULE, color: HEADING }}>
+          Bill To
+        </h3>
+        <p className="text-base font-semibold">{invoice.storeName}</p>
+        {customer?.address && <p className="text-neutral-600">{customer.address}</p>}
+        {customer?.phone && <p className="text-neutral-600">{customer.phone}</p>}
+      </div>
+
+      {/* Items */}
+      <div className="mt-6">
+        <h3 className="mb-2 border-b pb-1 text-xs font-semibold uppercase tracking-widest" style={{ borderColor: RULE, color: HEADING }}>
+          Item Details
+        </h3>
+        <table className="w-full border-collapse">
+          <thead>
+            <tr className="border-b border-neutral-300 text-xs uppercase tracking-wide text-neutral-500">
+              <th className="px-2 py-2 text-left font-medium">Item</th>
+              <th className="w-24 px-2 py-2 text-right font-medium">Qty</th>
+              <th className="w-36 px-2 py-2 text-right font-medium">Unit Price</th>
+              <th className="w-40 px-2 py-2 text-right font-medium">Amount</th>
+              {renderActions && <th className="w-24 px-2 py-2 print:hidden" />}
+            </tr>
+          </thead>
+          <tbody>
+            {invoice.items.length === 0 && !footerRow ? (
+              <tr>
+                <td colSpan={4} className="px-2 py-6 text-center text-neutral-500">No items.</td>
+              </tr>
+            ) : (
+              invoice.items.map((item) => (
+                <tr
+                  key={item.id}
+                  className={cn('break-inside-avoid border-b border-neutral-200', item.isRemoved && 'text-neutral-400 line-through')}
+                >
+                  <td className="px-2 py-2.5">{item.itemName}</td>
+                  <td className="px-2 py-2.5 text-right">
+                    {renderQuantity && !item.isRemoved ? renderQuantity(item) : fmtQty(item.quantity)}
+                  </td>
+                  <td className="px-2 py-2.5 text-right">
+                    {renderUnitPrice && !item.isRemoved ? renderUnitPrice(item) : fmtMoney(item.unitPrice)}
+                  </td>
+                  <td className="px-2 py-2.5 text-right font-medium">{fmtMoney(item.quantity * item.unitPrice)}</td>
+                  {renderActions && <td className="px-2 py-2.5 text-right no-underline print:hidden">{renderActions(item)}</td>}
+                </tr>
+              ))
+            )}
+            {footerRow}
+          </tbody>
+        </table>
+        {hasRemoved && (
+          <p className="mt-2 text-xs text-neutral-500">Struck-through lines were removed and are not charged.</p>
+        )}
+      </div>
+
+      {/* Notes + totals */}
+      <div className="mt-6 grid grid-cols-[1fr_auto] gap-10">
+        <div>
+          {showAgentEdits && (
+            <>
+              <h3 className="mb-1 border-b pb-1 text-xs font-semibold uppercase tracking-widest" style={{ borderColor: RULE, color: HEADING }}>
+                Notes / Agent Edits
+              </h3>
+              {[0, 1, 2, 3].map((n) => (
+                <div key={n} className="h-7 border-b border-dotted border-neutral-400" />
+              ))}
+            </>
+          )}
+        </div>
+        <dl className="w-72 break-inside-avoid text-sm">
+          <div className="flex justify-between border-b py-1.5">
+            <dt className="text-neutral-500">Subtotal</dt>
+            <dd>{fmtMoney(total)}</dd>
+          </div>
+          <div className="flex justify-between border-y py-2 text-base font-bold" style={{ borderColor: RULE }}>
+            <dt>Total</dt>
+            <dd>{fmtMoney(total)}</dd>
+          </div>
+          {paid > 0 && (
+            <>
+              <div className="flex justify-between py-1.5">
+                <dt className="text-neutral-500">Paid</dt>
+                <dd>{fmtMoney(paid)}</dd>
+              </div>
+              <div className="flex justify-between border-t py-1.5 font-semibold">
+                <dt>Balance Due</dt>
+                <dd>{fmtMoney(balance)}</dd>
+              </div>
+            </>
+          )}
+        </dl>
+      </div>
+
+      {/* Payments */}
+      <div className="mt-6 break-inside-avoid">
+        <h3 className="mb-1 border-b pb-1 text-xs font-semibold uppercase tracking-widest" style={{ borderColor: RULE, color: HEADING }}>
+          Payments
+        </h3>
+        {payments.length === 0 ? (
+          <p className="text-neutral-500">No payment recorded yet.</p>
+        ) : (
+          <table className="w-full text-sm">
+            <tbody>
+              {payments.map((p) => (
+                <tr key={p.id} className="border-b border-neutral-100">
+                  <td className="w-28 py-1">{fmtDate(p.collectedAt)}</td>
+                  <td className="py-1">
+                    {p.method}
+                    {p.chequeNumber && <span className="text-neutral-500"> · Cheque {p.chequeNumber}</span>}
+                  </td>
+                  <td className="py-1 text-right font-medium">{fmtMoney(p.amount)}</td>
+                </tr>
+              ))}
+            </tbody>
+          </table>
+        )}
+      </div>
+
+      {/* Signatures */}
+      <div className="mt-14 grid grid-cols-2 gap-16 text-xs text-neutral-600">
+        <div className="border-t border-neutral-400 pt-1">Authorised by</div>
+        <div className="border-t border-neutral-400 pt-1">Received by (customer signature)</div>
+      </div>
+    </div>
+  )
+}
+
+// ─── 80mm / 58mm thermal receipt ──────────────────────────────────────────────
+
+function ReceiptSheet({
+  invoice,
+  payments = [],
+  customer,
+  paper,
+  showAgentEdits,
+  className,
+}: Omit<InvoiceTemplateProps, 'paper'> & { paper: Exclude<InvoicePaper, 'A4'> }) {
+  const { total, paid, balance } = totals(invoice, payments)
+  const status = statusLabel(invoice)
+  const narrow = paper === '58mm'
+  const rule = <div className="my-2 border-t border-dashed border-black" />
+  const num = (n: number) => n.toLocaleString('en-US', { minimumFractionDigits: 2, maximumFractionDigits: 2 })
+
+  return (
+    <div
+      className={cn(
+        'invoice-sheet mx-auto bg-white font-mono text-black shadow-sm print:shadow-none',
+        narrow ? 'w-[58mm] px-[4mm] py-[2.5mm] text-[9.5px]' : 'w-[80mm] px-[5mm] py-[4mm] text-[11px]',
+        className,
+      )}
+    >
+      <div className="text-center">
+        <p className="text-base font-bold tracking-widest">INVOICE</p>
+        {status && <p className="font-bold">*** {status} ***</p>}
+      </div>
+      {rule}
+      <div className="space-y-0.5">
+        <p>No: {invoiceNo(invoice.id)}</p>
+        <p>Date: {fmtDate(invoice.createdAt)}</p>
+        <p>Customer: {invoice.storeName}</p>
+        {customer?.phone && <p>Phone: {customer.phone}</p>}
+      </div>
+      {rule}
+      <div className="space-y-1.5">
+        {invoice.items.map((i) => (
+          <div key={i.id} className={cn(i.isRemoved && 'line-through opacity-60')}>
+            <p>{i.itemName}</p>
+            <p className="flex justify-between">
+              <span>{fmtQty(i.quantity)} x {num(i.unitPrice)}</span>
+              <span>{num(i.quantity * i.unitPrice)}</span>
+            </p>
+          </div>
+        ))}
+      </div>
+      {rule}
+      <p className="flex justify-between">
+        <span>Subtotal</span>
+        <span>{fmtMoney(total)}</span>
+      </p>
+      <div className="my-1 border-y-2 border-black py-1 text-sm font-bold">
+        <p className="flex justify-between">
+          <span>TOTAL</span>
+          <span>{fmtMoney(total)}</span>
+        </p>
+      </div>
+      {paid > 0 && (
+        <>
+          <p className="flex justify-between"><span>Paid</span><span>{fmtMoney(paid)}</span></p>
+          <p className="flex justify-between font-bold"><span>Balance</span><span>{fmtMoney(balance)}</span></p>
+        </>
+      )}
+      {payments.length > 0 && (
+        <>
+          {rule}
+          {payments.map((p) => (
+            <p key={p.id} className="flex justify-between">
+              <span>{fmtDate(p.collectedAt)} {p.method}</span>
+              <span>{num(p.amount)}</span>
+            </p>
+          ))}
+        </>
+      )}
+      {showAgentEdits && (
+        <>
+          {rule}
+          <p>Notes:</p>
+          {[0, 1, 2].map((n) => <div key={n} className="h-5 border-b border-dotted border-black" />)}
+        </>
+      )}
+      {rule}
+      <p className="text-center">Thank you!</p>
+    </div>
+  )
+}

distribution_fe/components/invoice/use-invoice-document.ts

@@ -0,0 +1,41 @@
+'use client'
+
+import { useEffect, useState } from 'react'
+import { invoices as invoicesApi, payments as paymentsApi, shopPos as shopPosApi, getApiError } from '@/lib/api/index'
+import type { PaymentResponse, InvoiceResponse } from '@/types/api'
+import type { InvoiceCustomer } from './invoice-template'
+
+// Loads everything the printed invoice needs. Only the invoice is required — if payments or the
+// customer details fail to load, that block is simply left out.
+export function useInvoiceDocument(invoiceId: string | null | undefined, enabled = true) {
+  const [invoice, setInvoice] = useState<InvoiceResponse | null>(null)
+  const [payments, setPayments] = useState<PaymentResponse[]>([])
+  const [customer, setCustomer] = useState<InvoiceCustomer | undefined>()
+  const [error, setError] = useState<string | null>(null)
+
+  useEffect(() => {
+    if (!enabled || !invoiceId) return
+    let cancelled = false
+    setInvoice(null)
+    setPayments([])
+    setCustomer(undefined)
+    setError(null)
+
+    invoicesApi.get(invoiceId)
+      .then((inv) => {
+        if (cancelled) return
+        setInvoice(inv)
+        paymentsApi.listByInvoice(inv.id).then((p) => !cancelled && setPayments(p)).catch(() => {})
+        shopPosApi.get(inv.shopPOId)
+          .then((po) => !cancelled && setCustomer({ address: po.storeAddress, phone: po.storeContactNumber }))
+          .catch(() => {})
+      })
+      .catch((err) => !cancelled && setError(getApiError(err)))
+
+    return () => {
+      cancelled = true
+    }
+  }, [invoiceId, enabled])
+
+  return { invoice, payments, customer, error }
+}

distribution_fe/lib/api/sales.ts

@@ -4,6 +4,7 @@ import type {
   ShopPOResponse,
   InvoiceResponse,
   InvoiceStatus,
+  InvoiceVersionResponse,
   PaymentStatus,
   PaymentResponse,
   PaymentMethod,
@@ -93,8 +94,14 @@ export const invoices = {
   print: (id: string, printedByUserId?: string | null) =>
     api.post<InvoiceResponse>(`/invoices/${id}/print`, { printedByUserId }).then(r => r.data),
 
-  finalize: (id: string, finalizedByUserId?: string | null) =>
-    api.post<InvoiceResponse>(`/invoices/${id}/finalize`, { finalizedByUserId }).then(r => r.data),
+  finalize: (id: string, finalizedByUserId?: string | null, adjustments?: { invoiceItemId: string; adjustedQuantity: number; isRemoved?: boolean }[]) =>
+    api.post<InvoiceResponse>(`/invoices/${id}/finalize`, { finalizedByUserId, adjustments }).then(r => r.data),
+
+  updateItems: (id: string, items: { invoiceItemId?: string; itemId?: string; quantity: number; unitPrice?: number | null; isRemoved?: boolean }[], editedByUserId?: string | null) =>
+    api.put<InvoiceResponse>(`/invoices/${id}/items`, { items, editedByUserId }).then(r => r.data),
+
+  versions: (id: string) =>
+    api.get<InvoiceVersionResponse[]>(`/invoices/${id}/versions`).then(r => r.data),
 }
 
 // ─── Payments ─────────────────────────────────────────────────────────────────

distribution_fe/types/api.ts

@@ -12,6 +12,7 @@ export type PurchaseOrderStatus =
   | 'Issued' | 'PartiallyReceived' | 'Received' | 'Closed' | 'Cancelled'
 export type ShopPOStatus = 'Pending' | 'PartiallyFulfilled' | 'Fulfilled' | 'Cancelled'
 export type InvoiceStatus = 'Draft' | 'Printed' | 'Finalized'
+export type InvoiceVersionStage = 'Created' | 'DraftEdited' | 'Printed' | 'Finalized'
 export type InvoiceCreationMode = 'ModeA' | 'ModeB'
 export type PaymentStatus = 'Pending' | 'PartiallyPaid' | 'Paid'
 export type PaymentMethod = 'Cash' | 'Cheque' | 'Credit'
@@ -1001,6 +1002,36 @@ export interface ShopPOResponse {
   cancelledByRole: string | null
 }
 
+export interface InvoiceItemResponse {
+  id: string
+  shopPOItemId: string | null
+  itemId: string
+  itemName: string
+  orderedQuantity: number | null
+  quantity: number
+  unitPrice: number
+  isRemoved: boolean
+}
+
+export interface InvoiceVersionItemResponse {
+  shopPOItemId: string | null
+  itemId: string
+  itemName: string
+  quantity: number
+  unitPrice: number
+  isRemoved: boolean
+}
+
+export interface InvoiceVersionResponse {
+  id: string
+  versionNumber: number
+  stage: InvoiceVersionStage
+  totalAmount: number
+  createdBy: string
+  createdAt: string
+  items: InvoiceVersionItemResponse[]
+}
+
 export interface InvoiceResponse {
   id: string
   shopPOId: string
@@ -1017,6 +1048,7 @@ export interface InvoiceResponse {
   paidAmount: number
   isActive: boolean
   createdAt: string
+  items: InvoiceItemResponse[]
 }
 
 export interface OutstandingPaymentsResponse {