2026-10-19 16:45:55 +05:30
42 changed files with 15821 additions and 792 deletions
@@ -32,7 +32,8 @@ public class GrnController(GrnService service, ICurrentUserService currentUser)
        if (userId is null) return BadRequest(new { error = "ReceivedByUserId is required while auth is unavailable" });
        try
        {
-            var inner = new CreateGrnRequest(request.WarehouseId, request.Items);
+            var inner = new CreateGrnRequest(request.WarehouseId, request.Items,
+                DiscountPercent: request.DiscountPercent, VatPercent: request.VatPercent, NbtPercent: request.NbtPercent);
            var result = await service.CreateAsync(request.PurchaseOrderId, inner, userId.Value, ct);
            return CreatedAtAction(nameof(GetById), new { id = result.Id }, result);
        }
@@ -13,20 +13,36 @@ public record GrnItemRequest(
    // Populated only when the item has TracksSerialNumbers set — must contain exactly AcceptedQuantity entries.
    List<string>? SerialNumbers = null,
    // Set for a direct receipt line (no purchase order).
-    Guid? ItemId = null);
+    Guid? ItemId = null,
+    // Cost per base-UOM unit. Null on a PO line falls back to the PO line's unit cost; null on a direct line is 0.
+    decimal? UnitCost = null,
+    // Null falls back to the GRN-wide percentage.
+    decimal? DiscountPercent = null,
+    decimal? VatPercent = null,
+    // Free-issue units: stocked but not costed. Serial/batch entries must cover accepted + free.
+    int FreeQuantity = 0,
+    // Ignored when NBT is disabled in configuration; null falls back to the GRN-wide percentage.
+    decimal? NbtPercent = null);

 public record CreateGrnRequest(
    Guid WarehouseId,
    List<GrnItemRequest> Items,
    // TEMPORARY: required while auth doesn't resolve a logged-in user server-side — see testbug.md #28.
-    Guid? ReceivedByUserId = null);
+    Guid? ReceivedByUserId = null,
+    // GRN-wide defaults for lines that don't set their own.
+    decimal? DiscountPercent = null,
+    decimal? VatPercent = null,
+    decimal? NbtPercent = null);

 public record CreateFlatGrnRequest(
    Guid PurchaseOrderId,
    Guid WarehouseId,
    List<GrnItemRequest> Items,
    // TEMPORARY: required while auth doesn't resolve a logged-in user server-side — see testbug.md #28.
-    Guid? ReceivedByUserId = null);
+    Guid? ReceivedByUserId = null,
+    decimal? DiscountPercent = null,
+    decimal? VatPercent = null,
+    decimal? NbtPercent = null);

 /// <summary>A goods receipt with no purchase order. SupplierId is optional.</summary>
 public record CreateDirectGrnRequest(
@@ -34,7 +50,10 @@ public record CreateDirectGrnRequest(
    List<GrnItemRequest> Items,
    Guid? SupplierId = null,
    // TEMPORARY: required while auth doesn't resolve a logged-in user server-side — see testbug.md #28.
-    Guid? ReceivedByUserId = null);
+    Guid? ReceivedByUserId = null,
+    decimal? DiscountPercent = null,
+    decimal? VatPercent = null,
+    decimal? NbtPercent = null);

 public record GrnBatchLineResponse(string? BatchNumber, DateTime? ExpiryDate, int Quantity);

@@ -47,7 +66,19 @@ public record GrnItemResponse(
    int AcceptedQuantity,
    int RejectedQuantity,
    List<GrnBatchLineResponse> Batches,
-    List<string> SerialNumbers);
+    List<string> SerialNumbers,
+    decimal UnitCost,
+    decimal DiscountPercent,
+    decimal VatPercent,
+    // Accepted qty x unit cost, before discount.
+    decimal GrossAmount,
+    decimal DiscountAmount,
+    decimal VatAmount,
+    // Gross - discount + VAT.
+    decimal LineTotal,
+    int FreeQuantity,
+    decimal NbtPercent,
+    decimal NbtAmount);

 public record GrnResponse(
    Guid Id,
@@ -59,4 +90,15 @@ public record GrnResponse(
    string? SupplierName,
    DateTime ReceivedAt,
    DateTime CreatedAt,
-    List<GrnItemResponse> Items);
+    List<GrnItemResponse> Items,
+    decimal DiscountPercent,
+    decimal VatPercent,
+    // Sum of line gross amounts.
+    decimal SubTotal,
+    decimal DiscountAmount,
+    // SubTotal - DiscountAmount (the base NBT is charged on; VAT is charged on this plus NBT).
+    decimal TaxableAmount,
+    decimal VatAmount,
+    decimal TotalAmount,
+    decimal NbtPercent,
+    decimal NbtAmount);
@@ -0,0 +1,37 @@
+namespace Distribution.Features.Grn;
+
+public record LineAmounts(decimal Gross, decimal Discount, decimal Nbt, decimal Vat, decimal Total);
+
+/// <summary>
+/// GRN costing. Per line: gross = accepted qty x unit cost; discount = gross x disc%;
+/// NBT = (gross - discount) x NBT%; VAT = (gross - discount + NBT) x VAT%;
+/// total = gross - discount + NBT + VAT. Rejected units are never costed.
+/// Each amount is rounded to 2 dp per line so the GRN totals equal the sum of what the lines show.
+/// </summary>
+public static class GrnPricing
+{
+    public static decimal Round(decimal value) => Math.Round(value, 2, MidpointRounding.AwayFromZero);
+
+    public static LineAmounts Line(
+        int acceptedQty, decimal unitCost, decimal discountPercent, decimal nbtPercent, decimal vatPercent)
+    {
+        var gross = Round(acceptedQty * unitCost);
+        var discount = Round(gross * discountPercent / 100m);
+        var net = gross - discount;
+        var nbt = Round(net * nbtPercent / 100m);
+        var vat = Round((net + nbt) * vatPercent / 100m);
+        return new LineAmounts(gross, discount, nbt, vat, net + nbt + vat);
+    }
+
+    public static void ValidatePercent(decimal value, string label)
+    {
+        if (value < 0 || value > 100)
+            throw new InvalidOperationException($"{label} must be between 0 and 100.");
+    }
+
+    public static void ValidateCost(decimal value, string label)
+    {
+        if (value < 0)
+            throw new InvalidOperationException($"{label} cannot be negative.");
+    }
+}
@@ -1,5 +1,6 @@
 using Distribution.Features.Po;
 using Distribution.Features.Stock;
+using Distribution.Features.SysConfig;
 using Distribution.Infra.UoW;
 using Distribution.Models;

@@ -11,22 +12,86 @@ public class GrnService(
    IStockRepository stockRepo,
    IUnitOfWork uow,
    Distribution.Features.Item.IItemRepository itemRepo,
-    Distribution.Features.Supplier.ISupplierRepository supplierRepo)
+    Distribution.Features.Supplier.ISupplierRepository supplierRepo,
+    Distribution.Features.SysConfig.SysConfigService sysConfig)
 {
    private static GrnItemResponse MapItem(Models.GoodsReceiptItem i)
    {
        // Direct-receipt lines carry the item themselves; PO lines resolve it through the PO line.
        var item = i.Item ?? i.PurchaseOrderItem!.Item;
+        var a = GrnPricing.Line(i.AcceptedQuantity, i.UnitCost, i.DiscountPercent, i.NbtPercent, i.VatPercent);
        return new(i.Id, i.FK_PurchaseOrderItemId, item.Id, item.Sku, item.Name,
            i.AcceptedQuantity, i.RejectedQuantity,
            i.Batches.Select(b => new GrnBatchLineResponse(b.ItemBatch.BatchNumber, b.ItemBatch.ExpiryDate, b.Quantity)).ToList(),
-            i.Serials.Select(s => s.ItemSerialNumber.SerialNumber).ToList());
+            i.Serials.Select(s => s.ItemSerialNumber.SerialNumber).ToList(),
+            i.UnitCost, i.DiscountPercent, i.VatPercent, a.Gross, a.Discount, a.Vat, a.Total, i.FreeQuantity,
+            i.NbtPercent, a.Nbt);
    }

-    private static GrnResponse Map(Models.GoodsReceipt gr) =>
-        new(gr.Id, gr.FK_PurchaseOrderId, gr.FK_ReceivedByUserId, gr.FK_WarehouseId, gr.Warehouse?.Name ?? string.Empty,
+    /// <summary>Units that actually enter stock: accepted plus free-issue. Serial/batch entries must cover this.</summary>
+    private static int StockQty(GrnItemRequest line) => line.AcceptedQuantity + line.FreeQuantity;
+
+    private static GrnResponse Map(Models.GoodsReceipt gr)
+    {
+        var items = gr.Items.Where(i => i.IsActive).Select(MapItem).ToList();
+        var subTotal = items.Sum(i => i.GrossAmount);
+        var discount = items.Sum(i => i.DiscountAmount);
+        var vat = items.Sum(i => i.VatAmount);
+        var nbt = items.Sum(i => i.NbtAmount);
+        return new(gr.Id, gr.FK_PurchaseOrderId, gr.FK_ReceivedByUserId, gr.FK_WarehouseId, gr.Warehouse?.Name ?? string.Empty,
            gr.FK_SupplierId, gr.Supplier?.Name,
-            gr.ReceivedAt, gr.CreatedAt, gr.Items.Where(i => i.IsActive).Select(MapItem).ToList());
+            gr.ReceivedAt, gr.CreatedAt, items,
+            gr.DiscountPercent, gr.VatPercent,
+            subTotal, discount, subTotal - discount, vat, subTotal - discount + nbt + vat,
+            gr.NbtPercent, nbt);
+    }
+
+    /// <summary>The percentages a receipt is saved with, after the configured tax rules were applied.</summary>
+    private record GrnHeader(decimal Discount, decimal Vat, decimal Nbt, decimal? RequestedVat, decimal? RequestedNbt);
+
+    /// <summary>
+    /// Validates and resolves the GRN-wide percentages that lines fall back to. A disabled tax is
+    /// forced to 0 whatever the client sent.
+    /// </summary>
+    private static GrnHeader ResolveHeader(GrnTaxSettings tax, decimal? discountPercent, decimal? vatPercent, decimal? nbtPercent)
+    {
+        var discount = discountPercent ?? 0m;
+        var vat = tax.VatMode == TaxMode.Disabled ? 0m : vatPercent ?? 0m;
+        var nbt = tax.NbtMode == TaxMode.Disabled ? 0m : nbtPercent ?? 0m;
+        GrnPricing.ValidatePercent(discount, "GRN discount %");
+        GrnPricing.ValidatePercent(vat, "GRN VAT %");
+        GrnPricing.ValidatePercent(nbt, "GRN NBT %");
+        return new GrnHeader(discount, vat, nbt, vatPercent, nbtPercent);
+    }
+
+    /// <summary>
+    /// A line's rate for one tax: 0 when the tax is disabled; otherwise the line's own value, else the
+    /// GRN-wide one. A Mandatory tax must be supplied somewhere; an Optional one defaults to 0.
+    /// </summary>
+    private static decimal ResolveTax(TaxMode mode, decimal? headerValue, decimal? lineValue, string label)
+    {
+        if (mode == TaxMode.Disabled) return 0m;
+        var value = lineValue ?? headerValue;
+        if (value is null)
+        {
+            if (mode == TaxMode.Mandatory) throw new InvalidOperationException($"{label} is mandatory.");
+            return 0m;
+        }
+        GrnPricing.ValidatePercent(value.Value, label);
+        return value.Value;
+    }
+
+    /// <summary>Copies a line's resolved cost, discount %, NBT % and VAT % onto the entity after validating them.</summary>
+    private static void ApplyPricing(Models.GoodsReceiptItem entity, GrnItemRequest line, decimal fallbackUnitCost,
+        GrnHeader header, GrnTaxSettings tax, string sku)
+    {
+        entity.UnitCost = line.UnitCost ?? fallbackUnitCost;
+        entity.DiscountPercent = line.DiscountPercent ?? header.Discount;
+        entity.VatPercent = ResolveTax(tax.VatMode, header.RequestedVat, line.VatPercent, $"VAT % for item {sku}");
+        entity.NbtPercent = ResolveTax(tax.NbtMode, header.RequestedNbt, line.NbtPercent, $"NBT % for item {sku}");
+        GrnPricing.ValidateCost(entity.UnitCost, $"Unit cost for item {sku}");
+        GrnPricing.ValidatePercent(entity.DiscountPercent, $"Discount % for item {sku}");
+    }

    public async Task<PagedResponse<GrnResponse>> GetAllAsync(Guid? purchaseOrderId, int page, int pageSize)
    {
@@ -55,9 +120,9 @@ public class GrnService(
    {
        if (item.TracksSerialNumbers)
        {
-            if (line.AcceptedQuantity > 0 && (line.SerialNumbers is null || line.SerialNumbers.Count != line.AcceptedQuantity))
+            if (StockQty(line) > 0 && (line.SerialNumbers is null || line.SerialNumbers.Count != StockQty(line)))
                throw new InvalidOperationException(
-                    $"Item {item.Sku} tracks serial numbers — expected {line.AcceptedQuantity} serial number(s).");
+                    $"Item {item.Sku} tracks serial numbers — expected {StockQty(line)} serial number(s).");

            if (line.SerialNumbers is { Count: > 0 } && line.SerialNumbers.Distinct().Count() != line.SerialNumbers.Count)
                throw new InvalidOperationException($"Duplicate serial numbers supplied for item {item.Sku}.");
@@ -68,11 +133,11 @@ public class GrnService(
        }
        else if (item.TracksBatches || item.TracksExpiryDate)
        {
-            if (line.AcceptedQuantity > 0)
+            if (StockQty(line) > 0)
            {
                if (line.Batches is null || line.Batches.Count == 0)
                    throw new InvalidOperationException($"Item {item.Sku} requires batch/expiry information.");
-                if (line.Batches.Sum(b => b.Quantity) != line.AcceptedQuantity)
+                if (line.Batches.Sum(b => b.Quantity) != StockQty(line))
                    throw new InvalidOperationException($"Batch quantities for item {item.Sku} must sum to the accepted quantity.");
            }

@@ -96,7 +161,8 @@ public class GrnService(

    /// <summary>
    /// Validates the Po status, increments PurchaseOrderItem.ReceivedQuantity, writes StockBalance/
-    /// StockMovement for AcceptedQuantity only (RejectedQuantity never touches stock), creates
+    /// StockMovement for AcceptedQuantity + FreeQuantity (RejectedQuantity never touches stock; free
+    /// units don't count against the PO's ordered quantity), creates
    /// ItemBatch/ItemSerialNumber records for tracked items, and transitions the Po to
    /// PartiallyReceived/Received. All in one unit of work.
    /// </summary>
@@ -115,12 +181,18 @@ public class GrnService(
        if (request.Items is null || request.Items.Count == 0)
            throw new InvalidOperationException("A goods receipt must have at least one line item.");

+        var tax = await sysConfig.GetGrnTaxSettingsAsync();
+        var header = ResolveHeader(tax, request.DiscountPercent, request.VatPercent, request.NbtPercent);
+
        var goodsReceipt = new Models.GoodsReceipt
        {
            FK_PurchaseOrderId = po.Id,
            FK_ReceivedByUserId = receivedByUserId,
            FK_WarehouseId = request.WarehouseId,
-            ReceivedAt = DateTime.Now
+            ReceivedAt = DateTime.Now,
+            DiscountPercent = header.Discount,
+            VatPercent = header.Vat,
+            NbtPercent = header.Nbt
        };

        var grLines = new List<(Models.GoodsReceiptItem Entity, GrnItemRequest Line, Models.Item Item)>();
@@ -136,7 +208,7 @@ public class GrnService(
            if (poItem.IsCancelled)
                throw new InvalidOperationException($"Line for item {poItem.FK_ItemId} is cancelled and cannot receive stock.");

-            if (line.AcceptedQuantity < 0 || line.RejectedQuantity < 0)
+            if (line.AcceptedQuantity < 0 || line.RejectedQuantity < 0 || line.FreeQuantity < 0)
                throw new InvalidOperationException("Accepted/rejected quantities cannot be negative.");

            if (line.AcceptedQuantity + line.RejectedQuantity + poItem.ReceivedQuantity > poItem.Quantity)
@@ -160,8 +232,10 @@ public class GrnService(
            {
                FK_PurchaseOrderItemId = poItem.Id,
                AcceptedQuantity = line.AcceptedQuantity,
+                FreeQuantity = line.FreeQuantity,
                RejectedQuantity = line.RejectedQuantity
            };
+            ApplyPricing(entity, line, poItem.UnitCost, header, tax, poItem.Item.Sku);
            goodsReceipt.Items.Add(entity);
            grLines.Add((entity, line, poItem.Item));
        }
@@ -185,13 +259,19 @@ public class GrnService(
        if (request.SupplierId is not null && await supplierRepo.GetByIdAsync(request.SupplierId.Value) is not { IsActive: true })
            throw new InvalidOperationException("Supplier not found.");

+        var tax = await sysConfig.GetGrnTaxSettingsAsync();
+        var header = ResolveHeader(tax, request.DiscountPercent, request.VatPercent, request.NbtPercent);
+
        var goodsReceipt = new Models.GoodsReceipt
        {
            FK_PurchaseOrderId = null,
            FK_SupplierId = request.SupplierId,
            FK_ReceivedByUserId = receivedByUserId,
            FK_WarehouseId = request.WarehouseId,
-            ReceivedAt = DateTime.Now
+            ReceivedAt = DateTime.Now,
+            DiscountPercent = header.Discount,
+            VatPercent = header.Vat,
+            NbtPercent = header.Nbt
        };

        var grLines = new List<(Models.GoodsReceiptItem Entity, GrnItemRequest Line, Models.Item Item)>();
@@ -206,10 +286,10 @@ public class GrnService(
            if (item is null || !item.IsActive)
                throw new InvalidOperationException($"Item {line.ItemId} not found.");

-            if (line.AcceptedQuantity < 0 || line.RejectedQuantity < 0)
+            if (line.AcceptedQuantity < 0 || line.RejectedQuantity < 0 || line.FreeQuantity < 0)
                throw new InvalidOperationException("Accepted/rejected quantities cannot be negative.");

-            if (line.AcceptedQuantity + line.RejectedQuantity == 0)
+            if (line.AcceptedQuantity + line.RejectedQuantity + line.FreeQuantity == 0)
                throw new InvalidOperationException($"Line for item {item.Sku} has no quantity.");

            ValidateLineShape(item, line);
@@ -228,9 +308,11 @@ public class GrnService(
            var entity = new Models.GoodsReceiptItem
            {
                FK_ItemId = item.Id,
+                FreeQuantity = line.FreeQuantity,
                AcceptedQuantity = line.AcceptedQuantity,
                RejectedQuantity = line.RejectedQuantity
            };
+            ApplyPricing(entity, line, 0m, header, tax, item.Sku);
            goodsReceipt.Items.Add(entity);
            grLines.Add((entity, line, item));
        }
@@ -255,7 +337,7 @@ public class GrnService(
        {
            await repo.AddAsync(goodsReceipt);

-            foreach (var (entity, line, item) in grLines.Where(x => x.Line.AcceptedQuantity > 0))
+            foreach (var (entity, line, item) in grLines.Where(x => StockQty(x.Line) > 0))
            {
                if (item.TracksSerialNumbers)
                {
@@ -369,12 +451,12 @@ public class GrnService(
                            FK_ItemId = item.Id,
                            LocationId = warehouseId,
                            LocationType = LocationType.Warehouse,
-                            Quantity = line.AcceptedQuantity
+                            Quantity = StockQty(line)
                        });
                    }
                    else
                    {
-                        balance.Quantity += line.AcceptedQuantity;
+                        balance.Quantity += StockQty(line);
                        balance.UpdatedAt = DateTime.Now;
                        stockRepo.UpdateBalance(balance);
                    }
@@ -386,7 +468,7 @@ public class GrnService(
                        FromLocationType = LocationType.External,
                        ToLocationId = warehouseId,
                        ToLocationType = LocationType.Warehouse,
-                        Quantity = line.AcceptedQuantity,
+                        Quantity = StockQty(line),
                        Type = MovementType.PurchaseReceipt,
                        ReferenceId = goodsReceipt.Id,
                        CreatedBy = receivedByUserId
@@ -28,5 +28,7 @@ public interface IStockRepository

    // Serial numbers
    Task<bool> SerialNumberExistsAsync(Guid itemId, string serialNumber);
+    /// <summary>One past the highest numeric suffix among the item's existing serials that start with <paramref name="prefix"/> (1 if none).</summary>
+    Task<int> GetNextSerialSequenceAsync(Guid itemId, string prefix);
    Task AddItemSerialNumberAsync(ItemSerialNumber serial);
 }
@@ -37,6 +37,14 @@ public class StockController(StockService service, ICurrentUserService currentUs
        return Ok(result);
    }

+    /// <summary>Next free number for auto-generated serials (e.g. after ...-0005 the answer is 6).</summary>
+    [HttpGet("serials/next-sequence")]
+    public async Task<IActionResult> GetNextSerialSequence([FromQuery] Guid itemId, [FromQuery] string prefix = "")
+    {
+        var next = await service.GetNextSerialSequenceAsync(itemId, prefix);
+        return Ok(new { next });
+    }
+
    [HttpGet("movements")]
    public async Task<IActionResult> GetMovements(
        [FromQuery] Guid? locationId,
@@ -107,6 +107,26 @@ public class StockRepository(AppDBContext db) : IStockRepository
    public Task<bool> SerialNumberExistsAsync(Guid itemId, string serialNumber) =>
        db.ItemSerialNumbers.AnyAsync(s => s.FK_ItemId == itemId && s.SerialNumber == serialNumber);

+    public async Task<int> GetNextSerialSequenceAsync(Guid itemId, string prefix)
+    {
+        // Only serials of the form <prefix><digits> count; anything else (a supplier's own serial that
+        // happens to start with the prefix) is ignored for numbering.
+        var serials = await db.ItemSerialNumbers
+            .AsNoTracking()
+            .Where(s => s.FK_ItemId == itemId && s.SerialNumber.StartsWith(prefix))
+            .Select(s => s.SerialNumber)
+            .ToListAsync();
+
+        var max = 0L;
+        foreach (var serial in serials)
+        {
+            var suffix = serial[prefix.Length..];
+            if (suffix.Length is > 0 and <= 9 && suffix.All(char.IsDigit) && long.TryParse(suffix, out var n))
+                max = Math.Max(max, n);
+        }
+        return (int)max + 1;
+    }
+
    public async Task AddItemSerialNumberAsync(ItemSerialNumber serial) =>
        await db.ItemSerialNumbers.AddAsync(serial);
 }
@@ -96,6 +96,10 @@ public class StockService(
            b.Quantity, b.Item.ReorderLevel!.Value)).ToList();
    }

+    /// <summary>The next unused sequence number for generating serials like "&lt;prefix&gt;0001" for an item.</summary>
+    public Task<int> GetNextSerialSequenceAsync(Guid itemId, string prefix) =>
+        repo.GetNextSerialSequenceAsync(itemId, prefix ?? string.Empty);
+
    public async Task<StockTotalResponse?> GetItemTotalAsync(Guid itemId)
    {
        var item = await itemRepo.GetByIdAsync(itemId);
@@ -7,3 +7,6 @@ public record SysConfigResponse(string Key, string Value, DateTime UpdatedAt, Gu
 public record SetSysConfigRequest(string Value, Guid? UserId);

 public record SetInvoiceCreationModeRequest(InvoiceCreationMode Mode);
+
+/// <summary>Which taxes apply to a GRN, whether each must be filled in, and the rate new GRNs start with.</summary>
+public record GrnTaxSettings(TaxMode VatMode, decimal VatDefaultRate, TaxMode NbtMode, decimal NbtDefaultRate);
@@ -14,6 +14,14 @@ public class SysConfigService(ISysConfigRepository repo, IUnitOfWork uow)
    public const string KeyCustomWarrantyOverrideEnabled = "Feature.CustomWarrantyOverride";
    public const string KeyDefaultWarrantyPeriodDays = "Feature.DefaultWarrantyPeriodDays";

+    public const string KeyGrnVatMode = "Grn.Tax.Vat.Mode";
+    public const string KeyGrnVatRate = "Grn.Tax.Vat.DefaultRate";
+    public const string KeyGrnNbtMode = "Grn.Tax.Nbt.Mode";
+    public const string KeyGrnNbtRate = "Grn.Tax.Nbt.DefaultRate";
+
+    private static readonly string[] TaxModeKeys = [KeyGrnVatMode, KeyGrnNbtMode];
+    private static readonly string[] TaxRateKeys = [KeyGrnVatRate, KeyGrnNbtRate];
+
    private static readonly string[] BooleanFeatureKeys =
    [
        KeySerialNumberTrackingEnabled,
@@ -83,6 +91,33 @@ public class SysConfigService(ISysConfigRepository repo, IUnitOfWork uow)
        return config is not null && int.TryParse(config.Value, out var days) ? days : 0;
    }

+    /// <summary>
+    /// GRN tax settings. Unconfigured, VAT is Optional (how GRNs behaved before this setting existed)
+    /// and NBT is Disabled.
+    /// </summary>
+    public async Task<GrnTaxSettings> GetGrnTaxSettingsAsync() => new(
+        await GetTaxModeAsync(KeyGrnVatMode, TaxMode.Optional),
+        await GetRateAsync(KeyGrnVatRate),
+        await GetTaxModeAsync(KeyGrnNbtMode, TaxMode.Disabled),
+        await GetRateAsync(KeyGrnNbtRate));
+
+    private async Task<TaxMode> GetTaxModeAsync(string key, TaxMode fallback)
+    {
+        var config = await repo.GetByKeyAsync(key);
+        return config is not null && Enum.TryParse<TaxMode>(config.Value, out var mode) && Enum.IsDefined(mode)
+            ? mode
+            : fallback;
+    }
+
+    private async Task<decimal> GetRateAsync(string key)
+    {
+        var config = await repo.GetByKeyAsync(key);
+        return config is not null
+            && decimal.TryParse(config.Value, System.Globalization.NumberStyles.Number, System.Globalization.CultureInfo.InvariantCulture, out var rate)
+            ? rate
+            : 0m;
+    }
+
    private async Task<bool> GetBoolAsync(string key)
    {
        var config = await repo.GetByKeyAsync(key);
@@ -98,6 +133,15 @@ public class SysConfigService(ISysConfigRepository repo, IUnitOfWork uow)
        if (BooleanFeatureKeys.Contains(key) && !bool.TryParse(value, out _))
            throw new InvalidOperationException($"Invalid value '{value}' for '{key}'. Allowed values: true, false.");

+        if (TaxModeKeys.Contains(key) && (!Enum.TryParse<TaxMode>(value, out var taxMode) || !Enum.IsDefined(taxMode)))
+            throw new InvalidOperationException(
+                $"Invalid value '{value}' for '{key}'. Allowed values: {string.Join(", ", Enum.GetNames<TaxMode>())}.");
+
+        if (TaxRateKeys.Contains(key)
+            && (!decimal.TryParse(value, System.Globalization.NumberStyles.Number, System.Globalization.CultureInfo.InvariantCulture, out var rate)
+                || rate < 0 || rate > 100))
+            throw new InvalidOperationException($"Invalid value '{value}' for '{key}'. Must be a percentage from 0 to 100.");
+
        if (key == KeyDefaultWarrantyPeriodDays && (!int.TryParse(value, out var days) || days < 0))
            throw new InvalidOperationException($"Invalid value '{value}' for '{key}'. Must be a non-negative integer.");
    }
@@ -0,0 +1,105 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Distribution.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddGrnPricing : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<decimal>(
+                name: "DiscountPercent",
+                table: "GoodsReceipts",
+                type: "decimal(5,2)",
+                precision: 5,
+                scale: 2,
+                nullable: false,
+                defaultValue: 0m);
+
+            migrationBuilder.AddColumn<decimal>(
+                name: "VatPercent",
+                table: "GoodsReceipts",
+                type: "decimal(5,2)",
+                precision: 5,
+                scale: 2,
+                nullable: false,
+                defaultValue: 0m);
+
+            migrationBuilder.AddColumn<decimal>(
+                name: "DiscountPercent",
+                table: "GoodsReceiptItems",
+                type: "decimal(5,2)",
+                precision: 5,
+                scale: 2,
+                nullable: false,
+                defaultValue: 0m);
+
+            migrationBuilder.AddColumn<decimal>(
+                name: "UnitCost",
+                table: "GoodsReceiptItems",
+                type: "decimal(18,2)",
+                precision: 18,
+                scale: 2,
+                nullable: false,
+                defaultValue: 0m);
+
+            migrationBuilder.AddColumn<decimal>(
+                name: "VatPercent",
+                table: "GoodsReceiptItems",
+                type: "decimal(5,2)",
+                precision: 5,
+                scale: 2,
+                nullable: false,
+                defaultValue: 0m);
+
+            migrationBuilder.UpdateData(
+                table: "GoodsReceiptItems",
+                keyColumn: "Id",
+                keyValue: new Guid("44000000-0000-0000-0000-000000000001"),
+                columns: new[] { "DiscountPercent", "UnitCost", "VatPercent" },
+                values: new object[] { 0m, 0m, 0m });
+
+            migrationBuilder.UpdateData(
+                table: "GoodsReceiptItems",
+                keyColumn: "Id",
+                keyValue: new Guid("44000000-0000-0000-0000-000000000002"),
+                columns: new[] { "DiscountPercent", "UnitCost", "VatPercent" },
+                values: new object[] { 0m, 0m, 0m });
+
+            migrationBuilder.UpdateData(
+                table: "GoodsReceipts",
+                keyColumn: "Id",
+                keyValue: new Guid("43000000-0000-0000-0000-000000000001"),
+                columns: new[] { "DiscountPercent", "VatPercent" },
+                values: new object[] { 0m, 0m });
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "DiscountPercent",
+                table: "GoodsReceipts");
+
+            migrationBuilder.DropColumn(
+                name: "VatPercent",
+                table: "GoodsReceipts");
+
+            migrationBuilder.DropColumn(
+                name: "DiscountPercent",
+                table: "GoodsReceiptItems");
+
+            migrationBuilder.DropColumn(
+                name: "UnitCost",
+                table: "GoodsReceiptItems");
+
+            migrationBuilder.DropColumn(
+                name: "VatPercent",
+                table: "GoodsReceiptItems");
+        }
+    }
+}
@@ -0,0 +1,44 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Distribution.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddGrnFreeQuantity : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "FreeQuantity",
+                table: "GoodsReceiptItems",
+                type: "int",
+                nullable: false,
+                defaultValue: 0);
+
+            migrationBuilder.UpdateData(
+                table: "GoodsReceiptItems",
+                keyColumn: "Id",
+                keyValue: new Guid("44000000-0000-0000-0000-000000000001"),
+                column: "FreeQuantity",
+                value: 0);
+
+            migrationBuilder.UpdateData(
+                table: "GoodsReceiptItems",
+                keyColumn: "Id",
+                keyValue: new Guid("44000000-0000-0000-0000-000000000002"),
+                column: "FreeQuantity",
+                value: 0);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "FreeQuantity",
+                table: "GoodsReceiptItems");
+        }
+    }
+}
@@ -0,0 +1,66 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Distribution.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddGrnNbt : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<decimal>(
+                name: "NbtPercent",
+                table: "GoodsReceipts",
+                type: "decimal(5,2)",
+                precision: 5,
+                scale: 2,
+                nullable: false,
+                defaultValue: 0m);
+
+            migrationBuilder.AddColumn<decimal>(
+                name: "NbtPercent",
+                table: "GoodsReceiptItems",
+                type: "decimal(5,2)",
+                precision: 5,
+                scale: 2,
+                nullable: false,
+                defaultValue: 0m);
+
+            migrationBuilder.UpdateData(
+                table: "GoodsReceiptItems",
+                keyColumn: "Id",
+                keyValue: new Guid("44000000-0000-0000-0000-000000000001"),
+                column: "NbtPercent",
+                value: 0m);
+
+            migrationBuilder.UpdateData(
+                table: "GoodsReceiptItems",
+                keyColumn: "Id",
+                keyValue: new Guid("44000000-0000-0000-0000-000000000002"),
+                column: "NbtPercent",
+                value: 0m);
+
+            migrationBuilder.UpdateData(
+                table: "GoodsReceipts",
+                keyColumn: "Id",
+                keyValue: new Guid("43000000-0000-0000-0000-000000000001"),
+                column: "NbtPercent",
+                value: 0m);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "NbtPercent",
+                table: "GoodsReceipts");
+
+            migrationBuilder.DropColumn(
+                name: "NbtPercent",
+                table: "GoodsReceiptItems");
+        }
+    }
+}
@@ -427,6 +427,10 @@ namespace Distribution.Migrations
                    b.Property<DateTime>("CreatedAt")
                        .HasColumnType("datetime(6)");

+                    b.Property<decimal>("DiscountPercent")
+                        .HasPrecision(5, 2)
+                        .HasColumnType("decimal(5,2)");
+
                    b.Property<Guid?>("FK_PurchaseOrderId")
                        .HasColumnType("char(36)");

@@ -442,9 +446,17 @@ namespace Distribution.Migrations
                    b.Property<bool>("IsActive")
                        .HasColumnType("tinyint(1)");

+                    b.Property<decimal>("NbtPercent")
+                        .HasPrecision(5, 2)
+                        .HasColumnType("decimal(5,2)");
+
                    b.Property<DateTime>("ReceivedAt")
                        .HasColumnType("datetime(6)");

+                    b.Property<decimal>("VatPercent")
+                        .HasPrecision(5, 2)
+                        .HasColumnType("decimal(5,2)");
+
                    b.HasKey("Id");

                    b.HasIndex("FK_PurchaseOrderId");
@@ -460,11 +472,14 @@ namespace Distribution.Migrations
                        {
                            Id = new Guid("43000000-0000-0000-0000-000000000001"),
                            CreatedAt = new DateTime(2026, 8, 15, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            DiscountPercent = 0m,
                            FK_PurchaseOrderId = new Guid("41000000-0000-0000-0000-000000000001"),
                            FK_ReceivedByUserId = new Guid("29000000-0000-0000-0000-000000000001"),
                            FK_WarehouseId = new Guid("27000000-0000-0000-0000-000000000001"),
                            IsActive = true,
-                            ReceivedAt = new DateTime(2026, 8, 15, 0, 0, 0, 0, DateTimeKind.Unspecified)
+                            NbtPercent = 0m,
+                            ReceivedAt = new DateTime(2026, 8, 15, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            VatPercent = 0m
                        });
                });

@@ -480,6 +495,10 @@ namespace Distribution.Migrations
                    b.Property<DateTime>("CreatedAt")
                        .HasColumnType("datetime(6)");

+                    b.Property<decimal>("DiscountPercent")
+                        .HasPrecision(5, 2)
+                        .HasColumnType("decimal(5,2)");
+
                    b.Property<Guid>("FK_GoodsReceiptId")
                        .HasColumnType("char(36)");

@@ -489,12 +508,27 @@ namespace Distribution.Migrations
                    b.Property<Guid?>("FK_PurchaseOrderItemId")
                        .HasColumnType("char(36)");

+                    b.Property<int>("FreeQuantity")
+                        .HasColumnType("int");
+
                    b.Property<bool>("IsActive")
                        .HasColumnType("tinyint(1)");

+                    b.Property<decimal>("NbtPercent")
+                        .HasPrecision(5, 2)
+                        .HasColumnType("decimal(5,2)");
+
                    b.Property<int>("RejectedQuantity")
                        .HasColumnType("int");

+                    b.Property<decimal>("UnitCost")
+                        .HasPrecision(18, 2)
+                        .HasColumnType("decimal(18,2)");
+
+                    b.Property<decimal>("VatPercent")
+                        .HasPrecision(5, 2)
+                        .HasColumnType("decimal(5,2)");
+
                    b.HasKey("Id");

                    b.HasIndex("FK_GoodsReceiptId");
@@ -511,20 +545,30 @@ namespace Distribution.Migrations
                            Id = new Guid("44000000-0000-0000-0000-000000000001"),
                            AcceptedQuantity = 200,
                            CreatedAt = new DateTime(2026, 8, 15, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            DiscountPercent = 0m,
                            FK_GoodsReceiptId = new Guid("43000000-0000-0000-0000-000000000001"),
                            FK_PurchaseOrderItemId = new Guid("42000000-0000-0000-0000-000000000001"),
+                            FreeQuantity = 0,
                            IsActive = true,
-                            RejectedQuantity = 0
+                            NbtPercent = 0m,
+                            RejectedQuantity = 0,
+                            UnitCost = 0m,
+                            VatPercent = 0m
                        },
                        new
                        {
                            Id = new Guid("44000000-0000-0000-0000-000000000002"),
                            AcceptedQuantity = 98,
                            CreatedAt = new DateTime(2026, 8, 15, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            DiscountPercent = 0m,
                            FK_GoodsReceiptId = new Guid("43000000-0000-0000-0000-000000000001"),
                            FK_PurchaseOrderItemId = new Guid("42000000-0000-0000-0000-000000000002"),
+                            FreeQuantity = 0,
                            IsActive = true,
-                            RejectedQuantity = 2
+                            NbtPercent = 0m,
+                            RejectedQuantity = 2,
+                            UnitCost = 0m,
+                            VatPercent = 0m
                        });
                });

@@ -1500,17 +1544,17 @@ namespace Distribution.Migrations
                        new
                        {
                            Id = new Guid("24000000-0000-0000-0000-000000000001"),
+                            Code = "REG-0001",
                            CreatedAt = new DateTime(2026, 8, 20, 0, 0, 0, 0, DateTimeKind.Unspecified),
                            IsActive = true,
-                            Code = "REG-0001",
                            Name = "Western Province"
                        },
                        new
                        {
                            Id = new Guid("24000000-0000-0000-0000-000000000002"),
+                            Code = "REG-0002",
                            CreatedAt = new DateTime(2026, 8, 20, 0, 0, 0, 0, DateTimeKind.Unspecified),
                            IsActive = true,
-                            Code = "REG-0002",
                            Name = "Central Province"
                        });
                });
@@ -45,5 +45,8 @@ namespace Distribution.Models
    /// </summary>
    public enum InvoiceCreationMode { ModeA, ModeB }

+    /// <summary>How a tax applies on a document: not at all, may be left at 0, or must be filled in.</summary>
+    public enum TaxMode { Disabled, Optional, Mandatory }
+
    public enum SerialStatus { InStock, Sold, Returned, Damaged }
 }
@@ -1,4 +1,5 @@
 using System.ComponentModel.DataAnnotations.Schema;
+using Microsoft.EntityFrameworkCore;

 namespace Distribution.Models
 {
@@ -27,6 +28,18 @@ namespace Distribution.Models

        public DateTime ReceivedAt { get; set; } = DateTime.Now;

+        /// <summary>GRN-wide default discount %, applied to any line that doesn't set its own.</summary>
+        [Precision(5, 2)]
+        public decimal DiscountPercent { get; set; }
+
+        /// <summary>GRN-wide default VAT %, applied to any line that doesn't set its own.</summary>
+        [Precision(5, 2)]
+        public decimal VatPercent { get; set; }
+
+        /// <summary>GRN-wide default NBT %, applied to any line that doesn't set its own.</summary>
+        [Precision(5, 2)]
+        public decimal NbtPercent { get; set; }
+
        public ICollection<GoodsReceiptItem> Items { get; set; } = [];
    }
 }
@@ -1,4 +1,5 @@
 using System.ComponentModel.DataAnnotations.Schema;
+using Microsoft.EntityFrameworkCore;

 namespace Distribution.Models
 {
@@ -24,6 +25,25 @@ namespace Distribution.Models
        /// <summary>Damaged/short at receipt, not added to stock.</summary>
        public int RejectedQuantity { get; set; } = 0;

+        /// <summary>
+        /// Units the supplier gave at no charge. Received into stock like accepted units, but never
+        /// costed and never counted against the purchase order's ordered quantity.
+        /// </summary>
+        public int FreeQuantity { get; set; } = 0;
+
+        /// <summary>Cost per base-UOM unit. Only accepted units are costed.</summary>
+        [Precision(18, 2)]
+        public decimal UnitCost { get; set; }
+
+        [Precision(5, 2)]
+        public decimal DiscountPercent { get; set; }
+
+        [Precision(5, 2)]
+        public decimal VatPercent { get; set; }
+
+        [Precision(5, 2)]
+        public decimal NbtPercent { get; set; }
+
        /// <summary>Populated when the received item tracks batches and/or expiry dates.</summary>
        public ICollection<GoodsReceiptItemBatch> Batches { get; set; } = [];

@@ -97,11 +97,18 @@ PurchaseOrderItem
 ├── IsCancelled (bool)         — true once this line is individually cancelled, default false
 ```

+> **Update (GRN rework):** a goods receipt no longer requires a PO — see "Direct goods receipt" and
+> the costing / free-issue / tax additions in
+> [refactor_docs/grn_costing_and_taxes.md](./refactor_docs/grn_costing_and_taxes.md). The tree
+> below shows the original design plus those changes, marked *(later)*.
+
 ### GoodsReceipt
 ```
 GoodsReceipt
 ├── Id (Guid)                  — PK, from Template
-├── FK_PurchaseOrderId (Guid)  — required
+├── FK_PurchaseOrderId (Guid?) — nullable *(later)*: null = direct receipt (no PO)
+├── FK_SupplierId (Guid?)      — *(later)* set on a direct receipt; a PO receipt reaches the supplier via the PO
+├── DiscountPercent, VatPercent, NbtPercent (decimal 5,2) — *(later)* GRN-wide defaults for lines
 ├── FK_ReceivedByUserId (Guid) — required
 ├── FK_WarehouseId (Guid)      — required; the warehouse the accepted quantities are received into.
 │                                 Not anticipated in the original design — added because
@@ -116,9 +123,13 @@ GoodsReceipt
 GoodsReceiptItem
 ├── Id (Guid)                       — PK, from Template
 ├── FK_GoodsReceiptId (Guid)        — required
-├── FK_PurchaseOrderItemId (Guid)   — required, ties the receipt line back to its ordered line
+├── FK_PurchaseOrderItemId (Guid?)  — ties the receipt line back to its ordered line; null on a direct receipt
+├── FK_ItemId (Guid?)               — *(later)* the item, on a direct receipt line
 ├── AcceptedQuantity (int)          — added to warehouse stock
 ├── RejectedQuantity (int)          — damaged/short at receipt, default 0, not added to stock
+├── FreeQuantity (int)              — *(later)* free-issue units: added to stock, not costed, not counted against the PO
+├── UnitCost (decimal 18,2)         — *(later)* cost per unit; PO receipts default to the PO line's UnitCost
+├── DiscountPercent, NbtPercent, VatPercent (decimal 5,2) — *(later)* per-line rates
 ```

 ### PurchaseReturn
@@ -154,11 +165,16 @@ gives one receiving warehouse per PO in practice; see Open Questions for the mul

 ## Migrations

-One migration, applied:
 1. **AddProcurement** (`20260824110925_AddProcurement`) — created `PurchaseOrders`,
   `PurchaseOrderItems`, `GoodsReceipts`, `GoodsReceiptItems`, `PurchaseReturns`,
   `PurchaseReturnItems`, with FKs to `Suppliers`/`Items`/`Warehouses` and indexes on every FK
   column. Applied via `dotnet ef database update`.
+2. **AddDirectGoodsReceipt** (`20261006070042`) — made the PO links nullable and added the supplier /
+   item links for direct receipts.
+3. **AddGrnPricing**, **AddGrnFreeQuantity**, **AddGrnNbt** (`20261007…`, `20261008…`) — GRN costing,
+   free issues and NBT. Pricing and free quantity are applied; **AddGrnNbt was still pending** when
+   last checked, and GRN reads/writes fail until it is applied — see
+   [refactor_docs/grn_costing_and_taxes.md](./refactor_docs/grn_costing_and_taxes.md) §7.

 ---

@@ -182,11 +198,17 @@ One migration, applied:
 | `resolveInvoiceVariance(poId, variance, resolution)` | `POST /api/purchase-orders/{id}/resolve-variance` |

 ### Goods Receipt (`Features/Grn`)
+> A PO is **not mandatory** for a goods receipt: `POST /api/goods-receipts/direct` receives stock
+> with no PO (no ordered-quantity limit, no PO status, no purchase returns / invoice matching for
+> it). See [refactor_docs/grn_costing_and_taxes.md](./refactor_docs/grn_costing_and_taxes.md) §1 for
+> when to use which.
 | Function reference | Endpoint |
 |---|---|
-| `createGoodsReceipt(poId, warehouseId, items[])` | `POST /api/purchase-orders/{id}/goods-receipts` |
+| `createGoodsReceipt(poId, warehouseId, items[])` | `POST /api/purchase-orders/{id}/goods-receipts` (also `POST /api/goods-receipts` with `purchaseOrderId` in the body) |
+| `createDirectGoodsReceipt(warehouseId, supplierId?, items[])` | `POST /api/goods-receipts/direct` |
 | `getGoodsReceipt(grnId)` | `GET /api/goods-receipts/{id}` |
 | `listGoodsReceipts(poId)` | `GET /api/purchase-orders/{id}/goods-receipts` |
+| `listGoodsReceipts(page)` | `GET /api/goods-receipts` |

 ### Purchase Returns (`Features/PurchaseReturn`)
 | Function reference | Endpoint |
@@ -215,8 +237,12 @@ One migration, applied:
    { "purchaseOrderItemId": "...", "acceptedQuantity": 95, "rejectedQuantity": 5 }
 ] }
 ```
-`rejectedQuantity` defaults to 0 if omitted; only `acceptedQuantity` is credited to
-`StockBalance`.
+`rejectedQuantity` defaults to 0 if omitted. `acceptedQuantity` **plus `freeQuantity`** (free-issue
+units, default 0) is credited to `StockBalance`; only accepted units are costed and only accepted
+units advance the PO line's `ReceivedQuantity`. Optional pricing fields (`unitCost`,
+`discountPercent`, `vatPercent`, `nbtPercent` per line; `discountPercent`, `vatPercent`,
+`nbtPercent` for the whole GRN) are described in
+[refactor_docs/grn_costing_and_taxes.md](./refactor_docs/grn_costing_and_taxes.md).

 ### POST `/api/purchase-orders/{id}/returns`
 ```json
@@ -297,9 +323,10 @@ above) per 14's existing target design.
 - Where should cost-vs-sale-price margin reporting (`PurchaseOrderItem.UnitCost` vs
  `PriceListItem.Price`/`Item.SalePrice`) live — a read-only endpoint/report in this step, or a
  later analytics/reporting step? Not a blocker for the core PO→GRN flow.
- Landed cost (freight, duty, taxes allocated onto received stock) is out of scope —
-  `PurchaseOrderItem.UnitCost` is the only cost basis captured. Defer unless accurate per-unit cost
-  is needed sooner.
+- Landed cost (freight, duty allocated onto received stock) is out of scope. The GRN now records
+  unit cost, discount, NBT and VAT per line (see
+  [refactor_docs/grn_costing_and_taxes.md](./refactor_docs/grn_costing_and_taxes.md)), but these do
+  not feed stock valuation or `Item.CostPrice`, and the PO itself carries no discount or tax.
 - Reorder triggers (`setReorderPoint`/`sendLowStockAlert`) are not wired to procurement — restocking
  stays fully manual until Notifications & Alerts exists.
 - `createPurchaseReturn` assumes a single receiving warehouse per PO (uses the most recent
@@ -0,0 +1,166 @@
+# GRN: single entry screen, costing, free issues and configurable taxes
+
+**Status**: Implemented in code. Three migrations are written but must be applied with
+`dotnet ef database update` before GRNs can be saved or listed (see Migrations).
+**Touches**: `Features/Grn`, `Features/SysConfig`, `Models/GoodsReceipt*.cs`, the Configuration page,
+`distribution_fe/app/(dashboard)/procurement/grn/*`.
+**Related**: [15_procurement.md](../15_procurement.md) (PO → GRN flow),
+[item_tracking_config.md](./item_tracking_config.md) (serial / batch / expiry capture).
+
+---
+
+## 1. One screen for both kinds of receipt
+
+**Is a purchase order mandatory? No.** A PO is the order placed with a supplier *before* goods
+arrive; a GRN records what *actually* arrived and increases stock. Stock posting is identical either
+way. What a PO adds: auto-filled lines and costs, a hard stop on over-receiving, PO status tracking
+(Issued → Partially Received → Received), and the features that hang off a PO (purchase returns,
+invoice matching, supplier evaluation). A Direct GRN has none of these controls. Use a PO for normal
+ordering; use Direct GRN for unplanned deliveries, walk-in purchases or opening stock. Nothing
+currently restricts Direct GRN (no permission, no switch) — add one if every receipt must have an order.
+
+The old two pages (`/procurement/grn/po/new`, `/procurement/grn/direct/new`) are replaced by
+**`/procurement/grn/new`**. The GRN list has a single **New GRN** button.
+
+A **Receipt Type** switch at the top picks the behaviour:
+
+| | Against PO (default) | Direct GRN |
+|---|---|---|
+| Purchase order | required dropdown (Issued / PartiallyReceived only) | none |
+| Supplier | read-only, taken from the PO | optional dropdown |
+| Received date | shown | not shown (server stamps the time) |
+| Lines | prefilled from the PO: remaining qty, PO unit cost | any catalogue item, added by hand |
+| **Add Item** | adds a line chosen from **that PO's items** (e.g. a second batch of the same PO line) | adds a line with any item |
+| Endpoint | `POST /api/goods-receipts` | `POST /api/goods-receipts/direct` |
+| Service method | `GrnService.CreateAsync` | `GrnService.CreateDirectAsync` |
+
+Switching the type resets the lines. A receipt against a PO can only contain items that are on the PO;
+anything else must be a Direct GRN. Several lines may point at the same PO line; the over-receipt
+check runs against the running total as each line is applied.
+
+## 2. The items table
+
+Columns: **Item · Batch No · Accepted · Rejected · Free Qty · Unit Cost · Disc % · NBT % · VAT % ·
+Line Total** (NBT % / VAT % only when enabled in Configuration), plus a delete icon.
+
+- **Batch No** summarises the lots (`B1 ×5, B2 ×3`), a serial count, or an expiry-lot count. The
+  existing panel under the row still edits the serials / batches.
+- **Totals card** under the table: Subtotal, Discount, Taxable amount, NBT, VAT, Grand total.
+- **GRN Discount %, NBT %, VAT %** at the top are *defaults*: picking or typing a value (0–100,
+  decimals allowed) fills every line; any line can still be edited afterwards.
+
+## 3. Costing rules (server is the source of truth)
+
+Per line, rounded to 2 dp (half away from zero), in `Features/Grn/GrnPricing.cs`:
+
+```
+gross    = acceptedQty x unitCost
+discount = gross x disc%
+net      = gross - discount
+NBT      = net x NBT%
+VAT      = (net + NBT) x VAT%          // Sri Lanka order: VAT is charged on the NBT-inclusive amount
+total    = net + NBT + VAT
+```
+
+- Only **accepted** units are costed. Rejected units never are; **free** units are stocked but not
+  costed.
+- Unit cost: the request's value, else the PO line's `UnitCost` (PO receipts), else 0 (direct).
+- Disc % / NBT % / VAT %: the line's value, else the GRN-wide value.
+- Percentages must be 0–100, cost cannot be negative; violations are `409` with a message.
+- GRN totals are **not stored**. They are recomputed from the stored line percentages whenever a GRN
+  is read, so they cannot drift. The frontend mirrors the same formula (`grn-costing.tsx`).
+
+## 4. Free issues
+
+`GoodsReceiptItem.FreeQuantity`: units the supplier gave at no charge.
+
+- Added to stock together with accepted units (`StockBalance` / `StockMovement`).
+- Not costed and **not** counted against the PO line's ordered quantity (`ReceivedQuantity` grows by
+  accepted units only).
+- Serial / batch entries must cover **accepted + free** (10 accepted + 2 free = 12 serials, or batch
+  quantities summing to 12).
+- A line may be entirely free. A direct line is rejected only if accepted + rejected + free is 0.
+
+## 5. Configurable GRN taxes (Configuration → GRN Taxes)
+
+Stored in the existing `SysConfig` key/value table (no table change):
+
+| Key | Values | Unconfigured default |
+|---|---|---|
+| `Grn.Tax.Vat.Mode` | `Disabled` / `Optional` / `Mandatory` | `Optional` (how GRNs behaved before) |
+| `Grn.Tax.Vat.DefaultRate` | 0–100 | 0 |
+| `Grn.Tax.Nbt.Mode` | `Disabled` / `Optional` / `Mandatory` | `Disabled` |
+| `Grn.Tax.Nbt.DefaultRate` | 0–100 | 0 |
+
+Set through the generic `PUT /api/sys-config/{key}`; the service validates modes and rates.
+`SysConfigService.GetGrnTaxSettingsAsync()` reads them. The GRN screen reads the same keys from
+`GET /api/sys-config`.
+
+| Mode | GRN form | Server |
+|---|---|---|
+| Disabled ("Not applied") | field and column hidden | percentage forced to 0, client values ignored |
+| Optional | shown; may stay at 0 | missing value = 0 |
+| Mandatory | shown, red `*`; the GRN-wide field cannot be left blank (0% is allowed); Save is disabled while blank | request rejected (`409`, "… is mandatory") if neither the line nor the GRN supplies the value |
+
+Applies to **GRNs only**. The default rate seeds new GRNs (header and lines); users can change it.
+
+## 6. Data model changes
+
+| Table | New columns |
+|---|---|
+| `GoodsReceipts` | `DiscountPercent`, `VatPercent`, `NbtPercent` (`decimal(5,2)`, default 0) |
+| `GoodsReceiptItems` | `UnitCost` (`decimal(18,2)`), `DiscountPercent`, `VatPercent`, `NbtPercent` (`decimal(5,2)`), `FreeQuantity` (`int`), all default 0 |
+
+New enum `TaxMode { Disabled, Optional, Mandatory }`.
+
+### API surface
+
+Requests (`POST /api/goods-receipts`, `/api/goods-receipts/direct`, `/api/purchase-orders/{id}/goods-receipts`):
+header `discountPercent`, `vatPercent`, `nbtPercent`; per line `unitCost`, `discountPercent`,
+`vatPercent`, `nbtPercent`, `freeQuantity` (all optional).
+Responses add the same fields plus per-line `grossAmount`, `discountAmount`, `nbtAmount`,
+`vatAmount`, `lineTotal` and GRN-level `subTotal`, `discountAmount`, `taxableAmount`, `nbtAmount`,
+`vatAmount`, `totalAmount`. See `sharedDocs/BACKEND_API_REFERENCE.md` §6.19.
+
+## 7. Migrations
+
+1. `20261007063956_AddGrnPricing` — header + line discount / VAT, line unit cost. *Applied.*
+2. `20261007065602_AddGrnFreeQuantity` — line free quantity. *Applied.*
+3. `20261008060840_AddGrnNbt` — header + line NBT. ***Pending** when last checked
+   (`dotnet ef migrations list`).*
+
+All only add columns with default 0 (existing GRNs are unaffected). Run
+`dotnet ef database update` from `Distribution/` (stop a running API first, it locks the build).
+The app does not migrate on startup, so until the NBT migration is applied every call that reads or
+writes GRNs fails with `Unknown column 'g.NbtPercent'` (surfacing on save as a `DbUpdateException`).
+Re-check with `dotnet ef migrations list` before assuming a database is current.
+
+## 8. Auto-generated serial numbers continue from what is saved
+
+The panel's **Auto-generate** used to start at 1 each time, so a second receipt of the same item
+regenerated `BEV-Fanta-100-0001…` and the server rejected it ("Serial number … already exists for
+item …"). Now:
+
+- `GET /api/stock/serials/next-sequence?itemId=&prefix=` returns `{ "next": n }`: one past the highest
+  numeric suffix among the item's saved serials that look like `<prefix><digits>` (1 when none).
+  Serials that don't fit the pattern (e.g. a supplier's own numbers) are ignored.
+  (`StockRepository.GetNextSerialSequenceAsync`.)
+- Auto-generate calls it, then starts at `max(start field, next)`: first 5 units → `0001–0005`, next
+  receipt → `0006–0010`. The "start" field is updated after each run.
+- It also skips serials already in the same list and serials on **other lines of the same GRN for the
+  same item**, so two lines of one item cannot collide.
+- If the lookup fails, it warns and falls back to the start field; the server still rejects any
+  duplicate at save.
+- Serials already sitting in an open form are not rewritten: clear the list and generate again.
+
+## 9. Known limits / follow-ups
+
+- The PO receipt request carries no received date; the server stamps `DateTime.Now`. The date field on
+  the screen is sent but ignored.
+- In the over-receipt check, a PO line's *rejected* units from earlier lines / receipts are not
+  carried forward (only accepted units advance `ReceivedQuantity`). Pre-existing behaviour.
+- The GRN list table does not show costs or totals; the details dialog does (NBT only when present).
+- Mandatory means "must be filled in"; there is no rule forcing a rate above 0.
+- Tests: `Distribution.Tests/Services/GrnPricingTests.cs` covers the arithmetic and validation. The
+  server-side tax-mode handling, free-quantity stock posting and serial numbering have no automated
+  tests yet.
@@ -188,8 +188,10 @@ an item that doesn't track batches, or a missing expiry date on an item that req
  warranty-period number input, and (only when `Feature.CustomWarrantyOverride` is on) an
  `Allow custom warranty period` checkbox. Checkboxes for a disabled global feature are hidden
  entirely, not just disabled, to avoid confusing item editors.
- **GRN entry** — built as two full pages (against a PO: `/procurement/grn/po/new`; direct:
-  `/procurement/grn/direct/new`). Tracked lines show a status chip that opens a panel for serial
+- **GRN entry** — now **one page**, `/procurement/grn/new`, with an *Against PO / Direct GRN* switch
+  (the former `/procurement/grn/po/new` and `/procurement/grn/direct/new` pages were merged; see
+  [grn_costing_and_taxes.md](./grn_costing_and_taxes.md)). Serial / batch counts on a line must cover
+  *accepted + free* units. Tracked lines show a status chip that opens a panel for serial
  entry (scan / auto-generate / type-paste-edit) or batch rows (batch no. with Auto, expiry, qty).
  Save is disabled until every tracked line is complete. Details in the plan, Phases 10–12.
 - **configuration page**: a single Products card on `/configuration` holds the switches and warranty
@@ -233,13 +235,17 @@ Rejected quantity never touches stock. Everything posts in one unit of work and
 failure. A serial that already exists for the item, or a mismatch with the item's flags, is rejected.

 **Two ways to receive**: *against a PO* (lines come from the PO, PO received-quantities and status
-update) or *direct* (no PO; item chosen per line, optional supplier). The UI exposes them as two
-pages and both share the same serial/batch entry panel.
+update) or *direct* (no PO; item chosen per line, optional supplier). The UI exposes them as one
+page with a receipt-type switch, sharing the same serial/batch entry panel. Free-issue units are
+stocked like accepted ones, so the serial / batch totals include them.

 ### 3. Entering serials / batches in the UI
 - Each tracked line shows a chip (amber until complete, green ✓ when complete) → opens the panel.
- **Serials**: scan (Enter adds one), auto-generate (prefix + start number, fills only missing units),
-  or type/paste one per line; every entry stays editable; duplicates are flagged.
+- **Serials**: scan (Enter adds one), auto-generate (prefix + start number, fills only missing units;
+  numbering continues after the highest `<prefix><digits>` already saved for the item, so a later
+  receipt gets `0006–0010` rather than repeating `0001–0005` — see
+  [grn_costing_and_taxes.md](./grn_costing_and_taxes.md) §8), or type/paste one per line; every
+  entry stays editable; duplicates are flagged.
 - **Batches**: add rows; batch number can be typed, scanned or auto-generated; expiry date warns if
  expired or within 30 days; quantities must add up to the accepted quantity.
 - Save is disabled until all tracked lines are complete; the server re-validates.
@@ -0,0 +1,142 @@
+# Plan: Product Report
+
+## Status — implemented (Phases 1–3)
+
+Built as `Features/ProductReport` (`api/reports/products`: `stock`, `sales`, `returns`, `summary`)
+and the page `/reports/products` (Stock / Sales / Returns tabs, summary cards). Not built: Excel/PDF
+export, a `reports.view` permission and region/route/store scoping (the page reuses
+`warehouses.view`), purchase-return figures, the slow-stock / expiry phase (4).
+
+Decisions taken for the open questions below: **sales** = fulfilled quantity on non-cancelled shop
+POs whose invoice is `Finalized`, dated by `Invoice.FinalizedAt`; **margin** uses `Item.CostPrice`.
+
+Implementation notes (the database is **MySQL** via Pomelo, which constrains the queries):
+- EF's `GroupBy` + `Distinct().Count()` over a navigation (distinct stores per item) generates a
+  derived table that references the outer query, which MySQL rejects (`Unknown column … in 'WHERE'`).
+  Distinct stores are therefore counted in a second small query for the items on the current page.
+- Grouped queries project to an anonymous type, are ordered and paged on that, then mapped to the
+  response records. The stock report counts warehouse / vehicle quantity with per-item subqueries
+  instead of a `GroupBy` + `DefaultIfEmpty` join.
+- Limits: `pageSize` ≤ 200, date range ≤ 366 days.
+
+---
+
+## Context
+
+There is no reporting module yet. "Product" in this codebase is `Item`
+(`Distribution/Models/Item.cs`). A product report is a read-only aggregation over data that
+already exists, so **no new tables or migrations** are needed for the first phases.
+
+Source data (verified in the models):
+
+| Area | Entity | Useful fields |
+|---|---|---|
+| Master | `Item` | `Sku`, `Name`, `FK_CategoryId`, `FK_SubCategoryId`, `FK_BrandId`, `FK_BaseUomId`, `SalePrice`, `CostPrice`, `ReorderLevel`, tracking flags, `IsActive` (via `Template`) |
+| Stock | `StockBalance` | `FK_ItemId`, `LocationId` + `LocationType` (Warehouse/Vehicle/External), batch/serial, `Quantity` |
+| Stock history | `StockMovement` | `Type` (Sale, CustomerReturn, Transfer, Damage, Adjustment, Load, PurchaseReceipt, PurchaseReturn), `Quantity`, `CreatedAt` |
+| Sales | `ShopPOItem` | `Quantity`, `QuantityFulfilled`, `UnitPrice`; parent `ShopPO` (Status, ConfirmedAt, store) |
+| Invoice | `Invoice` | Has **no line items**. Links to `ShopPO` via `FK_ShopPOId`; `Status` (Draft/Printed/Finalized), `TotalAmount` |
+| Purchase | `PurchaseOrderItem`, `GoodsReceiptItem` | `UnitCost`, ordered qty; `AcceptedQuantity`, `RejectedQuantity` |
+| Returns | `SaleReturnItem`, `PurchaseReturnItem` | `Quantity`, `ReasonCode` (Expired/Damaged/OrderError/Other), `UnitPrice` |
+
+Important consequence: because `Invoice` has no line items, **product-level sales must come from
+`ShopPOItem` joined to a finalized `Invoice`** (via `ShopPO`), not from invoice rows.
+
+## Scope (phased)
+
+Each phase is independently shippable. Build in order.
+
+### Phase 1: Product Stock Report (no new data)
+
+One row per item (optionally per warehouse):
+
+- Sku, name, brand, category, sub-category, base UOM
+- Sale price, cost price, stock value (`Quantity * CostPrice`)
+- On-hand qty (sum of `StockBalance` for `LocationType.Warehouse`), on-vehicle qty
+  (`LocationType.Vehicle`), total
+- Low-stock flag (`Quantity <= ReorderLevel`), reuses the logic behind `GET /api/stock/low-stock`
+- Active/inactive
+
+Filters: brand, category, sub-category, warehouse, active only, low-stock only, search (sku/name).
+
+### Phase 2: Product Sales Report
+
+Per item for a date range:
+
+- Qty ordered, qty fulfilled, gross sales (`QuantityFulfilled * UnitPrice`)
+- Number of distinct shops/orders
+- Rank (top/bottom N)
+- Breakdown by region/route/store (grouping option)
+
+Rules:
+- Count only `ShopPO` rows where `Status != Cancelled`.
+- **Decision needed:** define "sales" once. Recommended: fulfilled quantity on shop POs whose
+  invoice is `Finalized` (matches the pipeline in `shoppo_invoice_pipeline.md`).
+- Date basis: `Invoice.FinalizedAt`.
+
+### Phase 3: Returns and Margin
+
+- Sales returns per item: qty, value, reason breakdown (`ReturnReasonCode`), return % of sold qty
+- Purchase returns per item
+- Gross margin: `(avg selling price - CostPrice) * qty`. Use `Item.CostPrice` first; later switch
+  to latest `PurchaseOrderItem.UnitCost` if cost history matters.
+
+### Phase 4: Movement / ageing (optional)
+
+- Slow/dead stock: items with no `StockMovement` of type `Sale`/`Load` in N days
+- Movement ledger per item (reuse `GET /api/stock/movements`)
+- Batch/expiry report for items with `TracksBatches`/`TracksExpiryDate`
+
+## Backend design
+
+Follow the existing feature layout (`Controller`, `Service`, `IRepository`, `Repository`, `DTOs`).
+
+New feature folder: `Distribution/Features/ProductReport/`
+
+- `ProductReportController.cs`, route `api/reports/products`
+  - `GET /stock` (Phase 1)
+  - `GET /sales` (Phase 2)
+  - `GET /returns` (Phase 3)
+  - `GET /summary`: top-line totals for the report header
+  - `GET /export?format=xlsx` (last step)
+- `IProductReportRepository` / `ProductReportRepository`: EF Core grouped queries
+  (`GroupBy` on `FK_ItemId`, `AsNoTracking`, projection straight into DTOs). No in-memory loops.
+- `ProductReportService`: applies filters, scope and paging; computes derived fields
+  (stock value, return %, margin).
+- `ProductReportDTOs.cs`: `ProductReportQuery` (filters, `From`, `To`, `Page`, `PageSize`, `SortBy`),
+  row DTOs per report, `PagedResult<T>` (reuse whatever the other features already use).
+- Register in `Program.cs` the same way as the other feature services.
+
+Cross-cutting:
+- **Authorization:** add a `reports.view` permission (see `Permission.cs`/`RolePermission.cs`) and
+  honour the existing `UserRegionScope`/`UserRouteScope`/`UserStoreScope` so users only see data
+  in their scope.
+- **Paging and limits:** default page size 50; cap date range (e.g. 366 days).
+- **Indexes:** check `ShopPOItem(FK_ItemId)`, `StockMovement(FK_ItemId, CreatedAt)`,
+  `StockBalance(FK_ItemId, LocationId)`; add only if the query plans need them.
+
+## Frontend design
+
+- Page: `distribution_fe/app/(dashboard)/reports/products/page.tsx`
+  (tabs: Stock, Sales, Returns)
+- API client: `distribution_fe/lib/api/reports.ts`, exported from `lib/api/index.ts`
+  (same pattern as `stock.ts`, `sales.ts`)
+- Filter bar (date range, brand, category, warehouse, region/route), summary tiles, table with
+  server-side paging and sorting, Export button.
+- Add a "Reports" entry to the dashboard nav.
+
+## Open questions
+
+1. Who is the primary reader (management, warehouse, sales)? This sets Phase 1 vs 2 priority.
+2. Definition of "sales": fulfilled qty on finalized invoices, or all confirmed shop POs?
+3. Cost basis for margin: `Item.CostPrice` or latest PO cost?
+4. Export format: Excel only, or PDF too?
+5. Do reports need to respect region/route/store scope for all roles?
+
+## Verification
+
+- Unit tests in `Distribution.Tests` for the service (filter, paging, derived fields) with seeded data.
+- Cross-check: Phase 1 on-hand totals equal `GET /api/stock/balances/{itemId}/total`.
+- Cross-check: Phase 2 sales total for a date range equals the sum of finalized `Invoice.TotalAmount`
+  for the same range (excluding any invoice-level adjustments).
+- Run with a large seed and check query time and that exports match the on-screen table.
@@ -0,0 +1,227 @@
+# Plan: Close the Ride → Loading Sheet → Shop PO → Delivery → Invoice → Payment pipeline
+
+## Context
+
+The goal was a step-by-step frontend flow for Operations (Rides/Loading Sheets/Delivery Tasks)
+and for Shop POs/Invoices, grounded in what the backend actually implements.
+
+Investigation found the pipeline was **not end-to-end**, even though most of the frontend UI for it
+already existed:
+
+- **Ride** (`RideController`) and **LoadingSheet** (`LoadingSheetController`) were fully implemented,
+  backend and frontend, and already worked (create → set items → confirm → stock moves warehouse→vehicle).
+- **ShopPO** (`ShopPOController`) was **GET-only** on the backend — no create/update-items/confirm/
+  confirm-and-create-invoice/cancel logic existed — despite the frontend
+  (`distribution_fe/app/(dashboard)/sales/new/page.tsx`, `lib/api/sales.ts`'s `shopPos` client)
+  already calling all five of those routes. Those calls previously 404'd.
+- **Invoice** (`InvoiceController`) was likewise **GET-only** — no print/finalize logic — despite the
+  frontend (`sales/orders/_components/orders-client.tsx`) already calling `invoices.print()` /
+  `invoices.finalize()`.
+- **DeliveryTask** generation (`DeliveryTaskService.GenerateAsync`) was stubbed:
+  `throw new NotImplementedException(...)`. No frontend trigger for it existed either.
+- **LoadingSheetOrder** (the link table between a `LoadingSheet` and the `ShopPO`s it's carrying) was
+  never populated anywhere in code — only by seed data — even though `LoadingSheetItem.FK_ShopPOItemId`
+  (optional, already wired end-to-end) was exactly the data needed to derive it.
+- **Payment** (`PaymentController`/`PaymentService`) was fully implemented on both ends already —
+  no changes needed there.
+
+The DTOs for the missing ShopPO endpoints (`CreateShopPORequest`, `UpdateShopPOItemsRequest`,
+`ShopPOItemRequest`) already existed in `Distribution/Features/ShopPO/ShopPODTOs.cs`, unused — the
+frontend and DTOs were clearly built ahead of the service/controller logic. This plan closes that
+gap: implement the missing backend pieces, wire the one still-missing frontend action (delivery task
+generation trigger), and document the resulting step-by-step flow.
+
+## Backend work
+
+### 1. `ShopPOService` — Create / UpdateItems / Confirm / ConfirmAndCreateInvoice / Cancel
+
+File: `Distribution/Features/ShopPO/ShopPOService.cs` (previously only had `GetAllAsync`/`GetByIdAsync`).
+New endpoints on `ShopPOController.cs` (previously GET-only), matching the routes the frontend
+already calls:
+
+- `POST /api/shop-pos` → `CreateAsync(CreateShopPORequest, Guid raisedById, ct)`
+  - Creates `ShopPO` with `Status = Pending`, `TotalAmount` computed from line items
+    (`Quantity * UnitPrice`, resolving `UnitPrice` server-side via `PriceListService.ResolveByStoreAsync`
+    when not supplied — the same resolution `sales/new/page.tsx` calls client-side at
+    `priceListsApi.resolve`).
+  - Creates `ShopPOItem` rows, `QuantityFulfilled = 0`.
+
+- `PUT /api/shop-pos/{id}/items` → `UpdateItemsAsync(id, UpdateShopPOItemsRequest, ct)`
+  - Guard: only allowed while `ConfirmedAt is null` (mirrors `LoadingSheetService.SetItemsAsync`'s
+    Planned-only guard) — same replace-all-items pattern (`ReplaceItemsAsync`).
+  - Recomputes `TotalAmount`.
+
+- `POST /api/shop-pos/{id}/confirm` → `ConfirmAsync(id, Guid confirmedBy, ct)`
+  - Guard: `ConfirmedAt is null` and `Status != Cancelled`.
+  - Sets `ConfirmedAt = DateTime.Now`, `ConfirmedBy = confirmedBy`. Status stays `Pending`
+    (fulfillment tracking is a separate axis, same pattern as `DeliveryTaskService.ConfirmAsync`
+    already updating `ShopPO.Status` independently of `ConfirmedAt`).
+  - Does **not** create an Invoice (delivery-later path — invoice creation trigger for that path
+    remains an open question, see below).
+
+- `POST /api/shop-pos/{id}/confirm-and-create-invoice` → `ConfirmAndCreateInvoiceAsync(id, Guid userId, ct)`
+  - Does everything `ConfirmAsync` does, plus creates an `Invoice` row (`FK_ShopPOId`, `Status = Draft`,
+    `PaymentStatus = Pending`, `CreatedBy = userId`, `TotalAmount = po.TotalAmount`) and sets
+    `po.InvoiceId`. This is the on-the-spot sale path (rep+driver together).
+
+- `POST /api/shop-pos/{id}/cancel` → `CancelAsync(id, ct)`
+  - Guard: `Status != Cancelled` and not already `PartiallyFulfilled`/`Fulfilled`.
+  - Sets `Status = Cancelled`.
+
+Follows the existing service pattern used by `RideService.CloseAsync`/`CancelAsync` and
+`LoadingSheetService.ConfirmAsync`: `uow.BeginAsync` → mutate → `repo.Update` →
+`uow.CommitAsync`/`RollbackAsync` on exception; controller catches `KeyNotFoundException` → 404,
+`InvalidOperationException` → 400.
+
+### 2. `LoadingSheetService.SetItemsAsync` — derive `LoadingSheetOrder` rows
+
+File: `Distribution/Features/LoadingEvent/LoadingSheetService.cs`. After replacing items, the
+distinct `FK_ShopPOId` values are looked up from each item's `FK_ShopPOItemId` (via the new
+`ILoadingSheetRepository.GetShopPOIdsByItemIdsAsync`), and `LoadingSheetOrder` rows for the sheet are
+replaced accordingly (`ReplaceOrdersAsync` — same replace-all-on-each-call approach as the items
+themselves). This makes `LoadingSheetResponse.Orders` (already returned, previously always empty
+outside seed data) actually populate, and is the data `DeliveryTaskService.GenerateAsync` needs.
+
+### 3. `DeliveryTaskService.GenerateAsync` — implemented
+
+File: `Distribution/Features/DeliveryRide/DeliveryTaskService.cs`. For the given `rideId`: finds the
+ride's confirmed `LoadingSheet`(s), reads their `LoadingSheetOrder` rows, and creates one
+`DeliveryTask` per distinct `ShopPO` referenced — `Status = Pending`, `Sequence` assigned in creation
+order, `CustomerConfirmed = false`. Skips POs that already have a `DeliveryTask` for this ride
+(idempotent, via `IDeliveryTaskRepository.ExistsForOrderAndRideAsync`). Guard: throws if the ride has
+no confirmed loading sheet.
+
+### 4. `InvoiceService` — Print / Finalize
+
+File: `Distribution/Features/Invoice/InvoiceService.cs` (previously only Get/GetAll). Adds:
+
+- `POST /api/invoices/{id}/print` → `PrintAsync(id, Guid printedBy, ct)`
+  - Guard: `Status == Draft`. Sets `Status = Printed`, `PrintedAt = Now`, `PrintedBy = printedBy`.
+- `POST /api/invoices/{id}/finalize` → `FinalizeAsync(id, FinalizeInvoiceRequest, Guid finalizedBy, ct)`
+  - Guard: `Status == Printed`. Sets `Status = Finalized`, `FinalizedAt = Now`, `FinalizedBy = finalizedBy`.
+  - Uses the pre-existing `FinalizeInvoiceRequest(List<InvoiceItemAdjustment>? Adjustments)` DTO
+    (was already defined, unused, in `InvoiceDTOs.cs` — `Adjustments` was made optional/nullable so
+    the current no-body frontend call still binds). When adjustments are supplied, each
+    `ShopPOItemId`'s billed quantity is overridden (validated to be between 0 and the item's ordered
+    `Quantity`) and `Invoice.TotalAmount` is recomputed as `Σ billedQuantity × UnitPrice`; with no
+    adjustments, `TotalAmount` is left as-is. This does **not** touch `ShopPOItem.QuantityFulfilled`
+    (that field is owned by the delivery-confirmation flow) — adjustments are billing-only. The
+    deeper CreditNote-based deduction design from `order_invoice_lifecycle.md` remains unbuilt; this
+    is a minimal, non-persisted (no adjustment audit trail) implementation.
+  - `InvoiceRepository.GetByIdAsync` was extended to also include `ShopPO.Items` (previously only
+    `ShopPO.Store`), needed to compute the adjustment total.
+  - Matches the frontend's existing `visible` guards in `orders-client.tsx` (`print` shown only when
+    `Draft`, `finalize` only when `Printed`) — no frontend change needed there, since the frontend
+    currently calls `finalize` with no body/adjustments.
+
+`PaymentService.CreateAsync` already blocks payments once `Status == Finalized` — consistent with
+this state machine.
+
+## Frontend work
+
+Almost everything needed already existed and was correctly wired to the (previously missing) backend
+routes above — once the backend work lands, `sales/new`, `sales/orders`, `sales/payments`,
+`operations/rides`, `operations/loading` all start working without changes. The one gap:
+
+- **Trigger for `DeliveryTaskService.GenerateAsync`**: no frontend call existed anywhere. Added a
+  `generate: (rideId: string) => api.post<DeliveryTaskResponse[]>(\`/rides/${rideId}/tasks/generate\`)`
+  method to `deliveryTasks` in `distribution_fe/lib/api/operations.ts` (route already defined in
+  `DeliveryTaskController.cs`), and a "Generate delivery tasks" **row action** on `Confirmed` sheets
+  in the Loading Sheets table (`operations/loading/_components/loading-sheets-client.tsx`) — not the
+  read-only `loading-sheet-view-sheet.tsx`, which stayed untouched — since that's where every other
+  sheet action (Set items, Confirm) already lives as a row action, and that's the point at which
+  `LoadingSheetOrder` data becomes available. Also required adding `'generate'` to the row-action
+  icon map, which turned out to be duplicated in two places
+  (`components/shared/row-actions.tsx`'s `ACTION_ICONS` and `components/shared/data-table/types.ts`'s
+  `RowActionKind` union) — both needed updating.
+
+## End-to-end flow (once the above lands)
+
+1. **Sales rep**: `/sales/new` → creates a `ShopPO` (`Pending`, unconfirmed) for a store with line items.
+2. **Confirm PO**: either `confirm` (delivery-later — no invoice yet) or `confirm-and-create-invoice`
+   (on-the-spot sale — `Invoice` created immediately, `Draft`).
+3. **Operations**: `/operations/rides` → create a `Ride` (`Open`) for a vehicle+driver.
+4. `/operations/loading` → create a `LoadingSheet` for that ride, set items (optionally tagging each
+   with the `ShopPOItem` it's fulfilling via `FK_ShopPOItemId`), confirm → stock moves warehouse→vehicle,
+   `LoadingSheetOrder` rows derived.
+5. Trigger **Generate delivery tasks** for the ride → one `DeliveryTask` per PO on the sheet.
+6. `/operations/deliveries` → for each task, set delivered quantities, confirm (stock moves
+   vehicle→external, `ShopPO.Status` synced to `Fulfilled`/`PartiallyFulfilled`) or fail.
+7. If not already created in step 2, an `Invoice` should exist by now for delivery-later POs —
+   **open question, not resolved by this plan**: no endpoint currently creates an Invoice for the
+   delivery-later path after fulfillment; flagged as a follow-up.
+8. `/sales/orders` (Invoices list) → `print` (`Draft → Printed`) → `finalize` (`Printed → Finalized`).
+9. `/sales/payments` → record payments against the invoice until `PaymentStatus = Paid` (blocked once
+   `Finalized`).
+10. Back in `/operations/rides` → **close** the ride (requires all vehicle stock cleared, i.e. every
+    loaded item delivered or otherwise moved off) or **cancel** it.
+
+## Addendum: Loading Sheet "Set Items" screen (region/route-filtered PO picker)
+
+While implementing the above, a further gap was found: the frontend never had any UI to actually set
+items on a `LoadingSheet` — `LoadingSheetCreateDialog` only picks a ride and creates an empty
+`Planned` sheet; `loadingSheets.updateItems()` existed in the API client but nothing called it.
+
+Practically, a loading sheet should be built *from* confirmed Shop POs (what to load = what's been
+ordered), narrowed by Region/Route so the rep isn't picking through every PO in the system.
+`Ride`/`Vehicle`/`DriverProfile` carry no route assignment in this app (rides/drivers/vehicles are
+not fixed to a route — confirmed as intentional, so a "derive route from the driver" auto-filter was
+rejected in favor of a manual filter). The resolution:
+
+- **Backend**: `ShopPOController`/`ShopPOService`/`ShopPORepository` `GetAll`/`GetCount` gained
+  `regionId` and `status` query filters (previously only `agentId`/`routeId`/`shopId`/`confirmed`),
+  filtering on `Store.Route.FK_RegionId` and `ShopPO.Status`. `GetAllAsync` now also includes each
+  PO's active `ShopPOItem`s (with `Item`) so the picker can render line items without N+1 calls.
+- **Frontend**: new `LoadingSheetItemsDialog`
+  (`operations/loading/_components/loading-sheet-items-dialog.tsx`), opened via a "Set items" row
+  action on `Planned` sheets in `loading-sheets-client.tsx`. It has manual Region and Route filter
+  dropdowns (Route list narrows to the selected Region via the existing `routes.list({ regionId })`),
+  fetches confirmed `Pending`/`PartiallyFulfilled` POs matching the filter, lists their outstanding
+  line items (`Quantity - QuantityFulfilled`) with a checkbox and quantity input per line, a single
+  Warehouse selector applied to all picked lines, and saves via the existing
+  `loadingSheets.updateItems()` call — which already tags each `LoadingSheetItem` with its source
+  `FK_ShopPOItemId`, so `LoadingSheetService.SetItemsAsync`'s `LoadingSheetOrder` derivation (see
+  above) picks it up automatically.
+- The "Confirm & commit stock" row action now also requires `sheet.items.length > 0`, since
+  confirming an item-less sheet was possible before but meaningless.
+
+## Addendum: Loading Sheets list filterable by Region/Route
+
+The Loading Sheets list (`loading-sheets-client.tsx`) previously only filtered by Ride and Status.
+Since a `LoadingSheet` has no direct region/route of its own, filtering is derived through
+`LoadingSheetOrder → ShopPO → Store → Route(.FK_RegionId)` — i.e. "sheets carrying at least one PO
+for a store on this route/region." `ILoadingSheetRepository`/`LoadingSheetService`/
+`LoadingSheetController` `GetAll`/`GetCount` gained `routeId`/`regionId` query params
+(`s.Orders.Any(o => o.ShopPO.Store.FK_RouteId == routeId)`, same pattern for region). Frontend added
+matching Region/Route filter dropdowns (Route list narrows to the selected Region), consistent with
+the `LoadingSheetItemsDialog` filter UX added above.
+
+## Open questions (not resolved by this pass)
+
+- No endpoint creates an `Invoice` for the delivery-later path (`ConfirmAsync`, not
+  `ConfirmAndCreateInvoiceAsync`) once fulfillment completes. `IShopPORepository.GetConfirmedWithoutInvoiceAsync`
+  already exists and looks purpose-built for this — likely intended for a future
+  "generate invoices for confirmed-but-unbilled POs" job or endpoint, not built in this pass.
+- Multi-invoice-per-PO, partial invoicing, and Invoice/OrderStatus axis merging remain unresolved,
+  consistent with `order_invoice_lifecycle.md`.
+
+## Known environment issue (unrelated to this pipeline's code)
+
+While verifying this pipeline live, every non-GET request (`POST`/`OPTIONS`, with or without a body,
+including to nonexistent routes and endpoints untouched by this work like `/api/auth/login`) hung
+indefinitely against the local backend, while every `GET` responded instantly. Since even a `POST` to
+a route that doesn't exist hangs before reaching routing/controller code, this rules out an
+application bug and points to something intercepting/filtering non-GET loopback HTTP traffic on the
+machine (antivirus/EDR web/HTTP inspection, or a proxy/VPN). Restarting the backend process did not
+resolve it. Not a defect in the code documented above — flagged here so it isn't mistaken for one
+during future verification.
+
+## Verification
+
+- `dotnet build Distribution/Distribution.csproj` clean after each service/controller addition.
+- Manually exercise the flow above via the existing frontend screens end-to-end against the local
+  backend (fresh `ShopPO` through to `Payment`), confirming each previously-404ing action (`create`,
+  `updateItems`, `confirm`, `confirmAndCreateInvoice`, `cancel`, `print`, `finalize`, `generate`) now
+  succeeds and the UI's existing `visible` guards match the state machine.
+- `npx tsc --noEmit -p tsconfig.json` in `distribution_fe` after the frontend addition (generate
+  trigger + api client method).
@@ -0,0 +1,105 @@
+# Shop PO → Invoice → Operations — Actual Flow (as implemented)
+
+**Status**: Reference — describes current code behavior, not a plan
+**Related docs**: 03_ride_lifecycle.md, 04_loading_event.md, 05_delivery_ride.md, 06_sale_ride.md (original specs — some details below diverge from those specs; this doc reflects what the code actually does today)
+
+---
+
+## Goal
+
+Trace the end-to-end lifecycle of a customer order from the moment a Shop PO is raised through
+billing (Invoice) and physical fulfillment (Ride → Loading Sheet → Delivery Task), including every
+status transition and stock movement along the way.
+
+---
+
+## 1. Shop PO (raised by a sales agent, on behalf of a store)
+
+**Pages**: `/sales` (list), `/sales/new` (create), `/sales/[id]` (detail)
+**Backend**: `Features/ShopPO`
+
+- **Create** (`ShopPOService.CreateAsync`): agent picks a store + items. Unit price resolves from
+  the active `PriceList` for that store's region, falling back to `Item.SalePrice` if none is
+  active. Status starts `Pending`.
+- **Confirm** (`ConfirmAsync`): sets `ConfirmedAt`/`ConfirmedBy`. Status **stays `Pending`** —
+  confirming does not change `Status`, it only marks the PO as ready to act on (load/invoice).
+- **Cancel**: only allowed while `Status == Pending` (not `PartiallyFulfilled`/`Fulfilled`).
+- A confirmed PO with no invoice yet (`ConfirmedAt != null && InvoiceId == null`) is the exact set
+  `GetConfirmedWithoutInvoiceAsync` and the Loading Sheet picker (`GET /shop-pos?confirmed=true`)
+  query for.
+
+## 2. Invoice (billing document, one per Shop PO)
+
+**Page**: `/sales/orders` (labeled "Orders" in the nav, but it is actually the Invoices list)
+**Backend**: `Features/Invoice`
+
+- 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.)
+- 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.
+- Payments (`payments` API) apply against the invoice, moving `PaymentStatus`:
+  `Pending → PartiallyPaid → Paid`.
+
+## 3. Operations: Ride → Loading Sheet → Confirm → Delivery Tasks
+
+**Pages**: `/operations/rides`, `/operations/loading`, `/operations/loading/new`
+**Backend**: `Features/Ride`, `Features/LoadingEvent`, `Features/DeliveryRide`
+
+1. **Ride** created with `Status: Open`. A Ride is just a Vehicle + Driver pairing — it has **no**
+   Route field in the current data model (unlike the original 03/06 specs' "ride type" framing).
+2. **Loading Sheet** created against an Open ride (`/operations/loading/new`):
+   - Pick a **Route** (required, first) → confirmed Shop POs for stores on that route load
+     (`ConfirmedAt != null`, status `Pending`/`PartiallyFulfilled`, remaining quantity > 0).
+   - Optionally narrow by **Shop** (store) within that route.
+   - Pick items/quantities to load, a **Warehouse** (single warehouse per sheet), and finally the
+     **Ride** to load onto.
+   - Sheet starts `Status: Planned`.
+3. **Set items** (`PUT /loading-sheets/{id}/items`) — editable only while `Planned`. Behavior is
+   **additive/upsert**, keyed by `(FK_ItemId, FK_WarehouseId, FK_ShopPOItemId)`: a matching row's
+   `QuantityDispatched` is updated in place, a new combination is added, and rows for combinations
+   not present in the request are left untouched. This lets a shortfall in one warehouse be topped
+   up from a second warehouse in a later save without losing the first line.
+4. **Confirm sheet** (`LoadingSheetService.ConfirmAsync`): for every line, deducts stock from its
+   Warehouse and credits it to the Ride's Vehicle (`StockMovement.Type = Load`,
+   `Warehouse → Vehicle`). Sheet → `Status: Confirmed`. This is the only point stock actually
+   leaves the warehouse. (Note: unlike the 04_loading_event.md spec, confirming a sheet does **not**
+   transition the Ride's own status — `RideStatus` only has `Open`/`Cancelled`/`Closed`, no
+   `Active`.)
+5. **Generate delivery tasks** (`DeliveryTaskService.GenerateAsync`): once a ride has at least one
+   `Confirmed` loading sheet, one `DeliveryTask` (`Status: Pending`) is created per distinct Shop PO
+   that sheet's `LoadingSheetOrder` rows reference.
+6. **Set quantities** on each task (`SetQuantitiesAsync`) — how much of each `ShopPOItem` was
+   actually delivered, capped at the item's ordered quantity. Only allowed while the task is
+   `Pending`.
+7. **Confirm task** (`DeliveryTaskService.ConfirmAsync`) — closes the loop back to the Shop PO:
+   - Moves stock **off the vehicle** (`StockMovement.Type = Sale`, `Vehicle → External`) for
+     whatever was fulfilled, failing if the vehicle doesn't actually have enough stock.
+   - Task → `Status: Delivered` (all items fully fulfilled) or `PartiallyDelivered`.
+   - Writes back to the Shop PO: `Status = Fulfilled`/`PartiallyFulfilled`, `FulfilledAt` set, and
+     each `ShopPOItem.QuantityFulfilled` bumped. This is exactly the field the Loading Sheet
+     picker's "remaining quantity" (`quantity - quantityFulfilled`) depends on — a fully fulfilled
+     PO drops out of the picker entirely.
+8. **Fail task**: marks `Status: Failed`. No stock movement, no Shop PO status change.
+
+---
+
+## Stock ledger across the whole flow
+
+```
+Warehouse --(Loading Sheet confirm, Type=Load)--> Vehicle --(Delivery Task confirm, Type=Sale)--> External/Customer
+```
+
+Every step writes a `StockMovement` row, so `StockBalance` for each Warehouse/Vehicle stays
+reconciled from Shop PO creation all the way through delivery.
+
+---
+
+## Known gaps at time of writing
+
+- No frontend UI calls `ConfirmAndCreateInvoiceAsync` — only the plain `Confirm` action (no
+  invoice) is wired up on the Shop PO screens.
+- `ShopPOController`/`LoadingSheetController` Create/Confirm endpoints, like most other
+  create/confirm endpoints in this codebase, rely on the TEMPORARY `currentUser.UserId ?? request.XxxUserId`
+  fallback pattern documented in `testbug.md` (#28) until the real auth middleware is fixed.
@@ -54,6 +54,7 @@ Running log of backend API failures found during testing and the corresponding f
 | 12 | Pricing → Schemes (action icons) | Same recurring pattern as Price Lists (#45): `DeleteAsync`'s `repo.Remove` already soft-deleted (`IsActive = false`), but `GetAllAsync`/`GetByIdAsync`/`UpdateAsync` filtered/blocked on `IsActive`, hiding a deleted scheme from the list entirely and blocking viewing/editing/reactivating it. `EvaluateEligibilityAsync` relied on that same repo-level filter to only ever consider active schemes as redemption candidates — removing the filter without care would have silently let inactive/deleted schemes be evaluated as eligible. Also `GetAll` returns a plain `List<SchemeResponse>` but the frontend was configured `serverSide: true` expecting a `PaginatedResponse`, so pagination silently did nothing | Added View (details modal — rule type, region, segment, date range, trigger/free-goods payout, bundle components) and Delete (soft-deactivate, reuses the existing "Active" checkbox in the Edit form to reactivate) icons | Removed the `IsActive` filter from `SchemeRepository.GetAllAsync`; moved the active-only filter into `SchemeService.EvaluateEligibilityAsync` itself (`.Where(s => s.IsActive)` on the fetched candidates) so eligibility evaluation is unaffected; removed the `IsActive` blocks from `GetByIdAsync`/`UpdateAsync`; added `IsActive` to `UpdateSchemeRequest`; switched the frontend to client-side pagination (same fix as Price Lists/Orders/Brands); added `schemes.remove()`; created `SchemeViewSheet` | 2026-09-09 |
 | 14 | Suppliers (action icons) | Exact same recurring pattern again: `SupplierRepository.GetAllAsync` filtered `.Where(s => s.IsActive)` (hiding a deleted supplier from the list instead of showing it Inactive), `GetByIdAsync`/`UpdateAsync` blocked viewing/editing an inactive one, and `UpdateSupplierRequest` had no `IsActive` field so the Edit form's existing "Active" checkbox couldn't reactivate one. Also `suppliers.list()` was typed as `PaginatedResponse` against a backend `GetAll` that returns a plain array, same pagination-shape bug as Price Lists/Schemes/Orders/Brands | Added View (details modal — name, contact, status, performance score, created date) and Delete (soft-deactivate, reuses the existing "Active" checkbox in Edit to reactivate) icons | Removed the `IsActive` filter from `SupplierRepository.GetAllAsync`; removed the `IsActive` blocks from `GetByIdAsync`/`UpdateAsync` (kept on `EvaluateAsync`, a real business guard — no point recomputing a performance score for a deleted supplier); added `IsActive` to `UpdateSupplierRequest`; switched the frontend to client-side pagination; added `suppliers.remove()`; created `SupplierViewSheet` | 2026-09-09 |
 | 48 | Pricing → Price Lists (new fields) | — | Added `RetailPrice` and `AgencyMarginPercent` to `PriceListItem`, alongside the existing `Price`/`MinPrice` band — see [14_pricing_and_suppliers.md](./14_pricing_and_suppliers.md) for the full business rules. `RetailPrice` is the MRP the store is expected to charge the end consumer (must be `>= Price`); `AgencyMarginPercent` is the regional agency's commission `%` of `Price` (must be `0-100`). Both are informational only — carried through `PriceResolution` for display/reporting, never enforced on order pricing | Added both columns to the Items table in the Price List Edit/View pages (add-row + inline edit + view-only table), and a "Retail price: Rs. X" hint under the unit price on Create Sale when the resolved price came from a real price list | Added `RetailPrice`/`AgencyMarginPercent` to `PriceListItem`, migration `AddRetailPriceAndAgencyMargin`; extended `UpsertPriceListItemRequest`/`PriceListItemResponse`/`PriceResolution` with validation (`RetailPrice >= Price`, `AgencyMarginPercent` in `[0,100]`); updated `PriceListItemsSection`, the View page's items table, and `priceLists.upsertItem()`; updated `docs/14_pricing_and_suppliers.md` | 2026-09-09 |
+| 49 | Configuration → Products (Product Capabilities toggles) — TEMPORARY workaround | `PUT /api/sys-config/{key}` had the same unhandled `var userId = currentUser.UserId ?? throw new UnauthorizedAccessException();` crash as #10/#36/#40/#8, surfaced the moment a toggle tried to save. A first attempt added `Guid? UserId = null` as a record constructor default, which broke `System.Text.Json` deserialization entirely (`NotSupportedException` — a record constructor parameter with a default value reads to STJ as an ambiguous/parameterless-like constructor) | Rebuilt the Configuration area end to end: sidebar "Configuration" is now a standalone link (no sub-nav/collapsible) straight to `/configuration`, a card-grid landing page; its "Products" card opens `/configuration/products`, a redesigned "Product Capabilities" card (two-column toggle grid, ON/OFF `Switch`, no "Enable…" wording). Removed the page's "Save Changes" button entirely — each toggle (and the default-warranty-days input, on blur) now calls the API immediately on change, optimistically updating and reverting with a toast on failure. Also renamed "Items" → "Products" in the Catalogue nav label, page heading, and the Add/Edit/View dialogs (left every other module's "Item" line-item wording — Sales/Procurement/GRN/Loading Sheets/Returns — untouched, since those are document line items, not the catalogue) | TEMP: added `UserId` (no default value, to keep STJ happy) to `SetSysConfigRequest`; `SysConfigController.Set` now does `currentUser.UserId ?? request.UserId`, returning a clean `BadRequest` instead of throwing when both are null. Frontend `sysConfig.set()` takes an optional `userId` and the Product Configuration page passes `useAuth().user.id` (the mock-auth user) on every toggle/save call. Revert once auth (#28) is fixed | 2026-10-02 |
 | 8 | Stock Balances | No way to correct a balance — stock is architecturally never edited directly, only through movement transactions (load, sale, return, damage, adjustment); the `POST /stock/adjustment` endpoint existed but its controller action always returned `Unauthorized()` because `currentUser.UserId` is unset (#28) | Added a View icon (details modal) and an Edit icon that opens an "Adjust Stock" dialog (signed quantity delta + reason + Adjusted By) which posts to `/stock/adjustment` — this is the correct way to change a balance, not a direct field edit | TEMP: added `AdjustedByUserId` fallback to `AdjustmentRequest`, same pattern as #36/#40; wired `StockBalanceViewSheet` + `StockAdjustDialog` into Stock Balances table | 2026-09-08 |
 | 9 | Stock Movements | Some rows missing From/To locations — every movement should always have both | Added View and Edit icons. Movements are an immutable audit-trail ledger by design — quantity, locations, and type can never change once recorded (the running balance is the sum of all movements), so Edit only lets you correct the Reason/note via a new `PATCH /stock/movements/{id}/reason` endpoint; a wrong quantity/location must be corrected with a new Adjustment (see #8), not by editing history | Wired `StockMovementViewSheet` + `StockMovementEditDialog` into Stock Movements table | 2026-09-08 |
 | 41 | Stock Balances / Stock Movements | Balances and Movements tables/view-sheets showed raw location GUIDs instead of names; Movements also had a genuinely missing side — Sale/PurchaseReceipt/PurchaseReturn/CustomerReturn/Damage/Adjustment each only ever wrote one of From/To, since the other side (customer, supplier, write-off, adjustment) has no real Warehouse/Vehicle record. Existing seeded movement rows still showed blank From/To after the code fix since it only affects newly-created movements | — | Added `LocationName` to `StockBalanceResponse` and `FromLocationName`/`ToLocationName` to `StockMovementResponse`, resolved server-side (`StockService`) by looking up the real Warehouse/Vehicle. Added a new `LocationType.External` plus a fixed `Guid.Empty` sentinel location so every movement's missing side is now always populated and labeled contextually ("Customer", "Supplier", "Written Off", "Stock Adjustment") instead of being left null. Updated all 6 movement-creation call sites (StockService Damage/CustomerReturn/Adjustment, SaleService, DeliveryTaskService, GrnService, PurchaseReturnService, ReturnService), and added migration `FixSeedStockMovementExternalLocations` to backfill the 2 affected seeded rows | 2026-09-08 |
@@ -75,6 +76,7 @@ Everything below is a stopgap that only exists because `Distribution/Middleware/
 11. **`CreateSaleReturnRequest.CreatedByUserId`** (`ReturnDTOs.cs`) and the "Created By" dropdown in the Record Order Return dialog (#23) — remove once `ReturnController.Create` can resolve `currentUser.UserId` on its own.
 12. **`SettleClaimRequest.SettledByUserId`** (`ClaimDTOs.cs`) and the "Settled By" dropdown in the Settle Claim dialog (#23) — remove once `ClaimController.Settle` can resolve `currentUser.UserId` on its own.
 13. **`CreateSupplierClaimRequest.RaisedByUserId`/`ApproveSupplierClaimRequest.ApprovedByUserId`/`RejectSupplierClaimRequest.RejectedByUserId`** (`SupplierClaimDTOs.cs`) and the corresponding user dropdowns in the Raise/Approve/Reject Supplier Claim dialogs (#23) — remove once `SupplierClaimController.Create`/`Approve`/`Reject` can resolve `currentUser.UserId` on their own.
+14. **`SetSysConfigRequest.UserId`** (`SysConfigDTOs.cs`) and the `userId` argument threaded through `sysConfig.set()` from the Product Configuration toggles page (`app/(dashboard)/configuration/products/page.tsx`, #49) — remove once `SysConfigController.Set` can resolve `currentUser.UserId` on its own; drop the `?? request.UserId` fallback and the `BadRequest` guard around it.

 ## Implementation Guide

@@ -0,0 +1,171 @@
+'use client'
+
+import { useEffect, useState } from 'react'
+import { HugeiconsIcon } from '@hugeicons/react'
+import { Discount01Icon } from '@hugeicons/core-free-icons'
+import { Input } from '@/components/ui/input'
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
+import { Card, CardContent, CardHeader, CardTitle, CardDescription } from '@/components/ui/card'
+import { FieldLabel, FieldDescription } from '@/components/ui/field'
+import { toast } from '@/components/ui/toast'
+import {
+  sysConfig,
+  grnTaxSettings,
+  GRN_TAX_KEYS,
+  DEFAULT_GRN_TAX_SETTINGS,
+  getApiError,
+} from '@/lib/api/index'
+import type { GrnTaxSettings, TaxMode } from '@/lib/api/sys-config'
+import { useAuth } from '@/contexts/auth-context'
+
+const MODE_LABELS: Record<TaxMode, string> = {
+  Disabled: 'Not applied',
+  Optional: 'Optional',
+  Mandatory: 'Mandatory',
+}
+
+const MODE_HINTS: Record<TaxMode, string> = {
+  Disabled: 'Hidden on GRN',
+  Optional: 'Shown, can be 0',
+  Mandatory: 'Shown, must be filled',
+}
+
+interface TaxRowProps {
+  id: string
+  title: string
+  description: string
+  mode: TaxMode
+  rate: number
+  pending: boolean
+  onModeChange: (mode: TaxMode) => void
+  onRateCommit: (rate: number) => void
+}
+
+function TaxRow({ id, title, description, mode, rate, pending, onModeChange, onRateCommit }: TaxRowProps) {
+  // Edit the rate as text and only save when it is valid and the field loses focus.
+  const [text, setText] = useState(String(rate))
+  useEffect(() => setText(String(rate)), [rate])
+
+  function commit() {
+    const n = Number(text)
+    if (text.trim() === '' || !Number.isFinite(n) || n < 0 || n > 100) {
+      setText(String(rate))
+      return
+    }
+    if (n !== rate) onRateCommit(n)
+  }
+
+  return (
+    <div className="grid gap-2.5 rounded-xl border border-border/60 bg-background px-3 py-2.5 sm:grid-cols-2">
+      <div className="flex items-baseline justify-between gap-2 sm:col-span-2">
+        <FieldLabel htmlFor={id} className="text-sm font-medium text-foreground">
+          {title} <span className="text-xs font-normal text-muted-foreground">· {description}</span>
+        </FieldLabel>
+        <FieldDescription className="text-xs">{MODE_HINTS[mode]}</FieldDescription>
+      </div>
+
+      <div className="flex flex-col gap-1">
+        <FieldLabel className="text-xs text-muted-foreground">Applies on GRN</FieldLabel>
+        <Select value={mode} onValueChange={v => v && onModeChange(v as TaxMode)} disabled={pending}>
+          <SelectTrigger id={id}>
+            <SelectValue />
+          </SelectTrigger>
+          <SelectContent>
+            {(Object.keys(MODE_LABELS) as TaxMode[]).map(m => (
+              <SelectItem key={m} value={m}>{MODE_LABELS[m]}</SelectItem>
+            ))}
+          </SelectContent>
+        </Select>
+      </div>
+
+      <div className="flex flex-col gap-1">
+        <FieldLabel className="text-xs text-muted-foreground">Default rate</FieldLabel>
+        <div className="relative">
+          <Input
+            type="number"
+            inputMode="decimal"
+            min={0}
+            max={100}
+            step={0.01}
+            value={text}
+            disabled={mode === 'Disabled' || pending}
+            onChange={e => setText(e.target.value)}
+            onBlur={commit}
+            className="pr-8"
+          />
+          <span className="pointer-events-none absolute inset-y-0 right-3 flex items-center text-sm text-muted-foreground">%</span>
+        </div>
+      </div>
+    </div>
+  )
+}
+
+/** GRN taxes: whether VAT and/or NBT apply to goods receipts, whether each is mandatory, and its default rate. */
+export function GrnTaxCard() {
+  const { user } = useAuth()
+  const [loading, setLoading] = useState(true)
+  const [settings, setSettings] = useState<GrnTaxSettings>(DEFAULT_GRN_TAX_SETTINGS)
+  const [pending, setPending] = useState<Record<string, boolean>>({})
+
+  useEffect(() => {
+    grnTaxSettings.get()
+      .then(setSettings)
+      .catch(err => toast.add({ title: 'Failed to load GRN tax settings', description: getApiError(err), type: 'error' }))
+      .finally(() => setLoading(false))
+  }, [])
+
+  // Saves one key immediately and rolls the field back if the server refuses it.
+  async function save(field: keyof GrnTaxSettings, configKey: string, value: TaxMode | number) {
+    const previous = settings[field]
+    setSettings(s => ({ ...s, [field]: value }))
+    setPending(p => ({ ...p, [configKey]: true }))
+    try {
+      await sysConfig.set(configKey, String(value), user.id)
+    } catch (err) {
+      setSettings(s => ({ ...s, [field]: previous }))
+      toast.add({ title: 'Failed to update configuration', description: getApiError(err), type: 'error' })
+    } finally {
+      setPending(p => ({ ...p, [configKey]: false }))
+    }
+  }
+
+  if (loading) return <p className="text-sm text-muted-foreground">Loading...</p>
+
+  return (
+    <Card className="h-full gap-3 rounded-3xl border-border/60 py-4">
+      <CardHeader className="border-b border-border/60 pb-3">
+        <div className="flex items-center gap-2.5">
+          <div className="flex h-8 w-8 shrink-0 items-center justify-center rounded-full bg-muted text-muted-foreground">
+            <HugeiconsIcon icon={Discount01Icon} size={16} />
+          </div>
+          <div>
+            <CardTitle className="text-base">GRN Taxes</CardTitle>
+            <CardDescription className="text-xs">VAT and NBT on goods receipts</CardDescription>
+          </div>
+        </div>
+      </CardHeader>
+      <CardContent className="flex flex-col gap-2.5">
+        <TaxRow
+          id="grnVatMode"
+          title="VAT"
+          description="Value added tax"
+          mode={settings.vatMode}
+          rate={settings.vatDefaultRate}
+          pending={!!pending[GRN_TAX_KEYS.vatMode] || !!pending[GRN_TAX_KEYS.vatRate]}
+          onModeChange={m => save('vatMode', GRN_TAX_KEYS.vatMode, m)}
+          onRateCommit={r => save('vatDefaultRate', GRN_TAX_KEYS.vatRate, r)}
+        />
+        <TaxRow
+          id="grnNbtMode"
+          title="NBT"
+          description="Nation building tax"
+          mode={settings.nbtMode}
+          rate={settings.nbtDefaultRate}
+          pending={!!pending[GRN_TAX_KEYS.nbtMode] || !!pending[GRN_TAX_KEYS.nbtRate]}
+          onModeChange={m => save('nbtMode', GRN_TAX_KEYS.nbtMode, m)}
+          onRateCommit={r => save('nbtDefaultRate', GRN_TAX_KEYS.nbtRate, r)}
+        />
+      </CardContent>
+    </Card>
+  )
+}
@@ -45,7 +45,7 @@ function CapabilityToggle({ id, label, description, checked, disabled, onChecked
  return (
    <div
      className={cn(
-        'flex items-start justify-between gap-4 rounded-2xl border border-border/60 bg-background p-4',
+        'flex items-center justify-between gap-3 rounded-xl border border-border/60 bg-background px-3 py-2.5',
        className,
      )}
    >
@@ -119,25 +119,24 @@ export function ProductCapabilitiesCard() {
  return loading ? (
      <p className="text-sm text-muted-foreground">Loading...</p>
    ) : (
-      <Card className="max-w-4xl rounded-3xl border-border/60">
-        <CardHeader className="border-b border-border/60 pb-5">
-          <div className="flex items-center gap-3">
-            <div className="flex h-9 w-9 shrink-0 items-center justify-center rounded-full bg-muted text-muted-foreground">
-              <HugeiconsIcon icon={Package01Icon} size={18} />
+      <Card className="h-full gap-3 rounded-3xl border-border/60 py-4">
+        <CardHeader className="border-b border-border/60 pb-3">
+          <div className="flex items-center gap-2.5">
+            <div className="flex h-8 w-8 shrink-0 items-center justify-center rounded-full bg-muted text-muted-foreground">
+              <HugeiconsIcon icon={Package01Icon} size={16} />
+            </div>
+            <div>
+              <CardTitle className="text-base">Products</CardTitle>
+              <CardDescription className="text-xs">Item tracking options</CardDescription>
            </div>
-            <CardTitle className="text-lg">Products</CardTitle>
          </div>
-          <CardDescription className="mt-3">
-            Serial number, batch, expiry and warranty tracking for catalogue items. Each switch applies immediately;
-            items then opt into the enabled capabilities from the item&apos;s edit form.
-          </CardDescription>
        </CardHeader>
-        <CardContent className="pt-5">
-          <div className="grid grid-cols-1 gap-4 md:grid-cols-2">
+        <CardContent>
+          <div className="grid grid-cols-1 gap-2.5 2xl:grid-cols-2">
            <CapabilityToggle
              id="serialNumberTracking"
              label="Serial number tracking"
-              description="Track individual units of an item by a unique serial number."
+              description="One serial per unit"
              checked={form.serialNumberTracking}
              disabled={pendingKeys[ITEM_TRACKING_KEYS.serialNumberTracking]}
              onCheckedChange={(v) => updateToggle('serialNumberTracking', ITEM_TRACKING_KEYS.serialNumberTracking, v)}
@@ -146,7 +145,7 @@ export function ProductCapabilitiesCard() {
            <CapabilityToggle
              id="batchTracking"
              label="Batch / lot tracking"
-              description="Group stock into batches or lots for traceability."
+              description="Group stock by batch"
              checked={form.batchTracking}
              disabled={pendingKeys[ITEM_TRACKING_KEYS.batchTracking]}
              onCheckedChange={(v) => updateToggle('batchTracking', ITEM_TRACKING_KEYS.batchTracking, v)}
@@ -155,7 +154,7 @@ export function ProductCapabilitiesCard() {
            <CapabilityToggle
              id="expiryDateTracking"
              label="Expiry date tracking"
-              description="Record and monitor expiry dates on perishable stock."
+              description="Record expiry dates"
              checked={form.expiryDateTracking}
              disabled={pendingKeys[ITEM_TRACKING_KEYS.expiryDateTracking]}
              onCheckedChange={(v) => updateToggle('expiryDateTracking', ITEM_TRACKING_KEYS.expiryDateTracking, v)}
@@ -164,7 +163,7 @@ export function ProductCapabilitiesCard() {
            <CapabilityToggle
              id="warrantyTracking"
              label="Warranty periods"
-              description="Attach a warranty period to items at the time of sale."
+              description="Warranty on sale"
              checked={form.warrantyTracking}
              disabled={pendingKeys[ITEM_TRACKING_KEYS.warrantyTracking]}
              onCheckedChange={(v) => updateToggle('warrantyTracking', ITEM_TRACKING_KEYS.warrantyTracking, v)}
@@ -173,24 +172,24 @@ export function ProductCapabilitiesCard() {

          {form.warrantyTracking && (
            <>
-              <Separator className="my-5" />
+              <Separator className="my-3" />

-              <div className="flex flex-col gap-4">
+              <div className="flex flex-col gap-2.5">
                <p className="text-xs font-medium tracking-wide text-muted-foreground uppercase">
                  Warranty defaults
                </p>

-                <div className="grid grid-cols-1 gap-4 md:grid-cols-2">
+                <div className="grid grid-cols-1 gap-2.5 2xl:grid-cols-2">
                  <CapabilityToggle
                    id="customWarrantyOverride"
                    label="Per-item custom warranty"
-                    description="Allow individual items to override the default warranty period."
+                    description="Items can override the default"
                    checked={form.customWarrantyOverride}
                    disabled={pendingKeys[ITEM_TRACKING_KEYS.customWarrantyOverride]}
                    onCheckedChange={(v) => updateToggle('customWarrantyOverride', ITEM_TRACKING_KEYS.customWarrantyOverride, v)}
                  />

-                  <div className="flex flex-col justify-center gap-2 rounded-2xl border border-border/60 bg-background p-4">
+                  <div className="flex flex-col justify-center gap-1.5 rounded-xl border border-border/60 bg-background px-3 py-2.5">
                    <FieldLabel htmlFor="defaultWarrantyPeriodDays" className="text-sm font-medium text-foreground">
                      Default warranty period
                    </FieldLabel>
@@ -206,9 +205,7 @@ export function ProductCapabilitiesCard() {
                      />
                      <span className="text-sm text-muted-foreground">days</span>
                    </div>
-                    <FieldDescription className="text-xs">
-                      Applied to items that don&apos;t set their own warranty period.
-                    </FieldDescription>
+                    <FieldDescription className="text-xs">Used when an item sets none</FieldDescription>
                  </div>
                </div>
              </div>
@@ -1,6 +1,7 @@
 'use client'

 import { ProductCapabilitiesCard } from './_components/product-capabilities-card'
+import { GrnTaxCard } from './_components/grn-tax-card'

 export default function ConfigurationPage() {
  return (
@@ -10,7 +11,15 @@ export default function ConfigurationPage() {
        <p className="text-sm text-muted-foreground mt-0.5">System-wide settings, grouped by area</p>
      </div>

-      <ProductCapabilitiesCard />
+      {/* 12-column grid: each card takes 6 columns so the two sit side by side; they stack on narrow screens. */}
+      <div className="grid grid-cols-12 items-stretch gap-6">
+        <div className="col-span-12 flex lg:col-span-6 [&>*]:w-full">
+          <ProductCapabilitiesCard />
+        </div>
+        <div className="col-span-12 flex lg:col-span-6 [&>*]:w-full">
+          <GrnTaxCard />
+        </div>
+      </div>
    </div>
  )
 }
@@ -124,16 +124,10 @@ export function GrnClient() {
            Stock received into a warehouse, against a purchase order or directly
          </p>
        </div>
-        <div className="flex items-center gap-2">
-          <Button variant="outline" onClick={() => router.push('/procurement/grn/direct/new')}>
-            <HugeiconsIcon icon={Add01Icon} size={16} strokeWidth={2} />
-            Direct Receipt
-          </Button>
-          <Button onClick={() => router.push('/procurement/grn/po/new')}>
-            <HugeiconsIcon icon={Add01Icon} size={16} strokeWidth={2} />
-            Receipt Against PO
-          </Button>
-        </div>
+        <Button onClick={() => router.push('/procurement/grn/new')}>
+          <HugeiconsIcon icon={Add01Icon} size={16} strokeWidth={2} />
+          New GRN
+        </Button>
      </div>

      <DataTable
@@ -0,0 +1,215 @@
+'use client'
+
+import { useEffect, useId, useState } from 'react'
+import type { Control, FieldPath, FieldValues } from 'react-hook-form'
+
+import { FormField } from '@/components/shared/form-field'
+import { Card, CardContent } from '@/components/ui/card'
+import { Field, FieldLabel } from '@/components/ui/field'
+import { Input } from '@/components/ui/input'
+import type { ItemSummaryResponse } from '@/types/api'
+import type { BatchRow } from './grn-tracking'
+
+/** Preset GRN-wide percentages. Any line can still be typed to a different value. */
+export const DISCOUNT_OPTIONS = [0, 2.5, 5, 10, 15, 20, 25]
+export const VAT_OPTIONS = [0, 5, 8, 12, 15, 18]
+export const NBT_OPTIONS = [0, 2]
+
+// Same rule as the server (GrnPricing): 2 dp, halves round away from zero, rounded per line.
+const round2 = (n: number) => Math.round(Number((n * 100).toPrecision(12))) / 100
+
+export interface CostedLine {
+  acceptedQuantity: number
+  unitCost: number
+  discountPercent: number
+  nbtPercent: number
+  vatPercent: number
+}
+
+/**
+ * gross = qty x cost; discount on gross; NBT on (gross - discount); VAT on (gross - discount + NBT);
+ * total = gross - discount + NBT + VAT. Mirrors the server (GrnPricing.Line).
+ */
+export function lineAmounts(l: CostedLine) {
+  const gross = round2((l.acceptedQuantity || 0) * (l.unitCost || 0))
+  const discount = round2((gross * (l.discountPercent || 0)) / 100)
+  const net = gross - discount
+  const nbt = round2((net * (l.nbtPercent || 0)) / 100)
+  const vat = round2(((net + nbt) * (l.vatPercent || 0)) / 100)
+  return { gross, discount, nbt, vat, total: net + nbt + vat }
+}
+
+export function grnTotals(lines: CostedLine[]) {
+  const amounts = lines.map(lineAmounts)
+  const subTotal = amounts.reduce((s, a) => s + a.gross, 0)
+  const discount = amounts.reduce((s, a) => s + a.discount, 0)
+  const nbt = amounts.reduce((s, a) => s + a.nbt, 0)
+  const vat = amounts.reduce((s, a) => s + a.vat, 0)
+  return { subTotal, discount, taxable: subTotal - discount, nbt, vat, total: subTotal - discount + nbt + vat }
+}
+
+export const money = (n: number) =>
+  n.toLocaleString('en-IN', { minimumFractionDigits: 2, maximumFractionDigits: 2 })
+
+/** Text for the Batch No column: lot numbers for batch items, a count for serial/expiry items. */
+export function batchSummary(
+  info: ItemSummaryResponse | undefined,
+  batches: BatchRow[],
+  serialText: string,
+): string {
+  if (!info) return '—'
+  if (info.tracksSerialNumbers) {
+    const n = serialText.split(/[\n,]+/).map(s => s.trim()).filter(Boolean).length
+    return n === 0 ? 'Serials not entered' : `${n} serial${n === 1 ? '' : 's'}`
+  }
+  if (info.tracksBatches) {
+    const named = batches.filter(b => b.batchNumber.trim())
+    return named.length === 0 ? 'Not entered' : named.map(b => `${b.batchNumber.trim()} ×${b.quantity}`).join(', ')
+  }
+  if (info.tracksExpiryDate) {
+    return batches.length === 0 ? 'Not entered' : `${batches.length} expiry lot${batches.length === 1 ? '' : 's'}`
+  }
+  return '—'
+}
+
+interface PercentSelectProps {
+  label: string
+  value: number
+  options: number[]
+  onChange: (value: number) => void
+  /** A required percentage can't be left blank (0 is fine); optional ones fall back to the last value. */
+  required?: boolean
+  /** Reports whether a required field is currently blank, so the form can block saving. */
+  onBlankChange?: (blank: boolean) => void
+}
+
+/**
+ * GRN-wide percentage: pick a preset from the list or type any value from 0 to 100. The text is kept
+ * locally while typing so "2." or "" don't get rewritten under the cursor; the number is only pushed
+ * up when it is valid.
+ */
+export function PercentSelect({ label, value, options, onChange, required, onBlankChange }: PercentSelectProps) {
+  const listId = useId()
+  const [text, setText] = useState(String(value))
+
+  // Follow outside changes (e.g. a reset) without fighting what the user is typing.
+  useEffect(() => {
+    setText(prev => (prev.trim() !== '' && Number(prev) === value ? prev : String(value)))
+    onBlankChange?.(false)
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [value])
+
+  const blank = text.trim() === ''
+
+  function handleChange(raw: string) {
+    setText(raw)
+    const n = Number(raw)
+    if (raw.trim() === '') {
+      onBlankChange?.(!!required)
+    } else if (Number.isFinite(n) && n >= 0 && n <= 100) {
+      onChange(n)
+      onBlankChange?.(false)
+    }
+  }
+
+  // An out-of-range entry falls back to the last valid value on blur; a blank one does too, unless
+  // the field is required (then it stays blank so the "Required" message and blocked save are visible).
+  function handleBlur() {
+    const n = Number(text)
+    if (blank && required) return
+    if (blank || !Number.isFinite(n) || n < 0 || n > 100) setText(String(value))
+  }
+
+  return (
+    <Field>
+      <FieldLabel>
+        {label}
+        {required && <span className="text-destructive"> *</span>}
+      </FieldLabel>
+      <div className="relative">
+        <Input
+          type="number"
+          inputMode="decimal"
+          min={0}
+          max={100}
+          step={0.01}
+          list={listId}
+          placeholder="Select or type"
+          value={text}
+          onChange={e => handleChange(e.target.value)}
+          onBlur={handleBlur}
+          aria-invalid={required && blank ? true : undefined}
+          className="pr-8"
+        />
+        <span className="pointer-events-none absolute inset-y-0 right-3 flex items-center text-sm text-muted-foreground">
+          %
+        </span>
+        <datalist id={listId}>
+          {options.map(o => (
+            <option key={o} value={o} />
+          ))}
+        </datalist>
+      </div>
+      {required && blank && <p className="text-xs text-destructive">{label} is required</p>}
+    </Field>
+  )
+}
+
+interface NumberCellProps<T extends FieldValues> {
+  control: Control<T>
+  name: FieldPath<T>
+  step?: number
+  max?: number
+}
+
+/** Numeric table-cell input bound to a form field. */
+export function NumberCell<T extends FieldValues>({ control, name, step = 1, max }: NumberCellProps<T>) {
+  return (
+    <FormField
+      control={control}
+      name={name}
+      render={({ field, invalid }) => (
+        <Input
+          type="number"
+          min={0}
+          max={max}
+          step={step}
+          value={Number(field.value as number)}
+          onChange={e => field.onChange(Number(e.target.value))}
+          onBlur={field.onBlur}
+          aria-invalid={invalid}
+        />
+      )}
+    />
+  )
+}
+
+/** Totals block under the items table. */
+export function GrnTotals({ lines, showNbt, showVat }: { lines: CostedLine[]; showNbt: boolean; showVat: boolean }) {
+  const t = grnTotals(lines)
+  const rows: [string, string][] = [
+    ['Subtotal', money(t.subTotal)],
+    ['Discount', `- ${money(t.discount)}`],
+    ['Taxable amount', money(t.taxable)],
+    ...(showNbt ? ([['NBT', money(t.nbt)]] as [string, string][]) : []),
+    ...(showVat ? ([['VAT', money(t.vat)]] as [string, string][]) : []),
+  ]
+  return (
+    <div className="flex justify-end">
+      <Card className="w-full max-w-sm rounded-2xl border-border/60">
+        <CardContent className="space-y-1.5 text-sm">
+          {rows.map(([label, value]) => (
+            <div key={label} className="flex justify-between">
+              <span className="text-muted-foreground">{label}</span>
+              <span>{value}</span>
+            </div>
+          ))}
+          <div className="flex justify-between border-t pt-2 text-base font-semibold">
+            <span>Grand total</span>
+            <span>{money(t.total)}</span>
+          </div>
+        </CardContent>
+      </Card>
+    </div>
+  )
+}
@@ -12,6 +12,7 @@ import {
  DialogTitle,
 } from '@/components/ui/dialog'
 import { toast } from '@/components/ui/toast'
+import { stock as stockApi } from '@/lib/api/stock'
 import type { GrnBatchLineBody } from '@/lib/api/procurement'
 import type { ItemSummaryResponse } from '@/types/api'

@@ -71,6 +72,8 @@ interface LineTrackingProps {
  batches: BatchRow[]
  onSerialText: (v: string) => void
  onBatches: (v: BatchRow[]) => void
+  /** Serials already typed on other lines of this GRN for the same item, so generation never repeats them. */
+  otherSerials?: string[]
 }

 /**
@@ -78,11 +81,21 @@ interface LineTrackingProps {
 * entry, so long serial lists don't stretch the form. Serial tracking takes precedence over
 * batch/expiry (same as the server). Warranty is not entered here — its clock starts at sale.
 */
-export function LineTracking({ info, name, accepted, serialText, batches, onSerialText, onBatches }: LineTrackingProps) {
+export function LineTracking({
+  info,
+  name,
+  accepted,
+  serialText,
+  batches,
+  onSerialText,
+  onBatches,
+  otherSerials = [],
+}: LineTrackingProps) {
  const [panelOpen, setPanelOpen] = useState(false)
  const [scanValue, setScanValue] = useState('')
  const [genPrefix, setGenPrefix] = useState(`${info.sku}-`)
  const [genStart, setGenStart] = useState(1)
+  const [generating, setGenerating] = useState(false)
  const progress = trackingProgress(info, accepted, serialText, batches)
  if (!progress) return null

@@ -98,19 +111,38 @@ export function LineTracking({ info, name, accepted, serialText, batches, onSeri
    setScanValue('')
  }

-  // Appends generated serials (prefix + zero-padded sequence) for the units still missing,
-  // skipping any value already in the list. They stay editable in the list below.
-  const generateSerials = () => {
+  // Appends generated serials (prefix + zero-padded sequence) for the units still missing. Numbering
+  // continues after the highest number already saved for this item (asked from the server), so a
+  // second receipt of the same item gets 0006–0010 instead of repeating 0001–0005. Values already in
+  // this list, or on other lines of this GRN, are skipped. They stay editable in the list below.
+  const generateSerials = async () => {
    const existing = parseSerials(serialText)
-    const taken = new Set(existing)
+    const taken = new Set([...existing, ...otherSerials])
    const missing = Math.max(0, accepted - existing.length)
+
+    setGenerating(true)
+    let start = genStart
+    try {
+      start = Math.max(genStart, await stockApi.nextSerialSequence(info.id, genPrefix))
+    } catch {
+      toast.add({
+        title: 'Could not check existing serial numbers',
+        description: 'Numbering starts from the value shown; the server will reject any serial that already exists.',
+        type: 'error',
+      })
+    } finally {
+      setGenerating(false)
+    }
+
    const generated: string[] = []
-    for (let n = genStart; generated.length < missing; n++) {
+    let n = start
+    while (generated.length < missing) {
      const sn = `${genPrefix}${String(n).padStart(4, '0')}`
      if (!taken.has(sn)) generated.push(sn)
+      n++
    }
    onSerialText([...existing, ...generated].join('\n'))
-    setGenStart(genStart + missing)
+    setGenStart(n)
  }

  const isSerial = progress.kind === 'serial'
@@ -145,7 +177,7 @@ export function LineTracking({ info, name, accepted, serialText, batches, onSeri
          <DialogHeader>
            <DialogTitle>{isSerial ? 'Serial numbers' : info.tracksBatches ? 'Batches' : 'Expiry lots'}</DialogTitle>
            <DialogDescription>
-              {name} ({info.sku}) — accepting {accepted}
+              {name} ({info.sku}) — receiving {accepted}
            </DialogDescription>
          </DialogHeader>

@@ -180,7 +212,7 @@ export function LineTracking({ info, name, accepted, serialText, batches, onSeri
                  <Button
                    type="button"
                    variant="outline"
-                    disabled={accepted - progress.done <= 0}
+                    disabled={accepted - progress.done <= 0 || generating}
                    onClick={generateSerials}
                  >
                    Auto-generate {Math.max(0, accepted - progress.done)}
@@ -8,6 +8,7 @@ import {
 } from '@/components/ui/dialog'
 import { Separator } from '@/components/ui/separator'
 import type { GrnResponse } from '@/types/api'
+import { money } from './grn-costing'

 const fmtDateTime = (v: string) =>
  new Date(v).toLocaleString('en-GB', {
@@ -34,10 +35,12 @@ function Row({ label, value }: { label: string; value: React.ReactNode }) {

 export function GrnViewSheet({ open, onClose, grn }: GrnViewSheetProps) {
  if (!grn) return null
+  // NBT only appears for receipts that were taxed with it, so older GRNs keep the same layout.
+  const hasNbt = grn.nbtPercent > 0 || grn.nbtAmount > 0 || grn.items.some(i => i.nbtPercent > 0)

  return (
    <Dialog open={open} onOpenChange={(v) => !v && onClose()}>
-      <DialogContent className="overflow-y-auto sm:max-w-2xl">
+      <DialogContent className="overflow-y-auto sm:max-w-4xl">
        <DialogHeader>
          <DialogTitle>Goods Receipt Details</DialogTitle>
        </DialogHeader>
@@ -63,6 +66,12 @@ export function GrnViewSheet({ open, onClose, grn }: GrnViewSheetProps) {
                  <th className="px-3 py-2 text-left font-medium">Item</th>
                  <th className="px-3 py-2 text-right font-medium">Accepted</th>
                  <th className="px-3 py-2 text-right font-medium">Rejected</th>
+                  <th className="px-3 py-2 text-right font-medium">Free</th>
+                  <th className="px-3 py-2 text-right font-medium">Unit Cost</th>
+                  <th className="px-3 py-2 text-right font-medium">Disc %</th>
+                  {hasNbt && <th className="px-3 py-2 text-right font-medium">NBT %</th>}
+                  <th className="px-3 py-2 text-right font-medium">VAT %</th>
+                  <th className="px-3 py-2 text-right font-medium">Line Total</th>
                </tr>
              </thead>
              <tbody>
@@ -94,11 +103,26 @@ export function GrnViewSheet({ open, onClose, grn }: GrnViewSheetProps) {
                    </td>
                    <td className="px-3 py-2 text-right">{item.acceptedQuantity}</td>
                    <td className="px-3 py-2 text-right">{item.rejectedQuantity}</td>
+                    <td className="px-3 py-2 text-right">{item.freeQuantity}</td>
+                    <td className="px-3 py-2 text-right">{money(item.unitCost)}</td>
+                    <td className="px-3 py-2 text-right">{item.discountPercent}%</td>
+                    {hasNbt && <td className="px-3 py-2 text-right">{item.nbtPercent}%</td>}
+                    <td className="px-3 py-2 text-right">{item.vatPercent}%</td>
+                    <td className="px-3 py-2 text-right font-medium">{money(item.lineTotal)}</td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
+
+          <div className="mt-3 ml-auto flex max-w-xs flex-col">
+            <Row label="Subtotal" value={money(grn.subTotal)} />
+            <Row label={`Discount (GRN ${grn.discountPercent}%)`} value={`- ${money(grn.discountAmount)}`} />
+            <Row label="Taxable amount" value={money(grn.taxableAmount)} />
+            {hasNbt && <Row label={`NBT (GRN ${grn.nbtPercent}%)`} value={money(grn.nbtAmount)} />}
+            <Row label={`VAT (GRN ${grn.vatPercent}%)`} value={money(grn.vatAmount)} />
+            <Row label="Grand total" value={<span className="text-base font-semibold">{money(grn.totalAmount)}</span>} />
+          </div>
        </div>
      </DialogContent>
    </Dialog>
@@ -1,316 +0,0 @@
-'use client'
-
-import { useEffect, useState } from 'react'
-import { useRouter } from 'next/navigation'
-import { HugeiconsIcon } from '@hugeicons/react'
-import { ArrowLeft01Icon } from '@hugeicons/core-free-icons'
-import { useFieldArray } from 'react-hook-form'
-import { useForm, zodResolver, z } from '@/lib/form'
-import { FormField } from '@/components/shared/form-field'
-import { Input } from '@/components/ui/input'
-import {
-  Select,
-  SelectContent,
-  SelectItem,
-  SelectTrigger,
-  SelectValue,
-} from '@/components/ui/select'
-import { Button } from '@/components/ui/button'
-import { FieldGroup } from '@/components/ui/field'
-import { Separator } from '@/components/ui/separator'
-import { toast } from '@/components/ui/toast'
-import type { GrnItemBody } from '@/lib/api/procurement'
-import {
-  grn as grnApi,
-  warehouses as warehousesApi,
-  users as usersApi,
-  suppliers as suppliersApi,
-  items as itemsApi,
-  getApiError,
-  getPaginatedItems,
-} from '@/lib/api/index'
-import type { WarehouseResponse, UserResponse, SupplierResponse, ItemSummaryResponse } from '@/types/api'
-import { LineTracking, trackingPayload, trackingProgress } from '../../_components/grn-tracking'
-
-const NO_SUPPLIER = 'none'
-
-const lineSchema = z.object({
-  itemId: z.string().min(1, 'Select an item'),
-  acceptedQuantity: z.number().min(0, 'Must be 0 or more'),
-  rejectedQuantity: z.number().min(0, 'Must be 0 or more'),
-  serialText: z.string(),
-  batches: z.array(z.object({ batchNumber: z.string(), expiryDate: z.string(), quantity: z.number() })),
-})
-
-const schema = z.object({
-  warehouseId: z.string().min(1, 'Warehouse is required'),
-  supplierId: z.string(),
-  receivedByUserId: z.string().min(1, 'Received by is required'),
-  items: z.array(lineSchema).min(1, 'Add at least one item'),
-})
-
-type FormValues = z.infer<typeof schema>
-
-const emptyLine = { itemId: '', acceptedQuantity: 1, rejectedQuantity: 0, serialText: '', batches: [] }
-
-/** Receive goods into a warehouse with no purchase order. */
-export default function NewDirectGrnPage() {
-  const router = useRouter()
-  const goBack = () => router.push('/procurement/grn')
-  const [warehousesList, setWarehousesList] = useState<WarehouseResponse[]>([])
-  const [usersList, setUsersList] = useState<UserResponse[]>([])
-  const [suppliersList, setSuppliersList] = useState<SupplierResponse[]>([])
-  const [itemsList, setItemsList] = useState<ItemSummaryResponse[]>([])
-
-  const form = useForm<FormValues>({
-    resolver: zodResolver(schema),
-    defaultValues: { warehouseId: '', supplierId: NO_SUPPLIER, receivedByUserId: '', items: [{ ...emptyLine }] },
-  })
-
-  const { fields, append, remove } = useFieldArray({ control: form.control, name: 'items' })
-
-  useEffect(() => {
-    Promise.all([
-      warehousesApi.list({ pageSize: 200 }),
-      usersApi.list({ pageSize: 200 }),
-      suppliersApi.list(),
-      itemsApi.list({ pageSize: 200 }),
-    ])
-      .then(([ws, us, ss, its]) => {
-        setWarehousesList(getPaginatedItems(ws))
-        setUsersList(getPaginatedItems(us))
-        setSuppliersList(ss)
-        setItemsList(getPaginatedItems(its))
-      })
-      .catch(err =>
-        toast.add({ title: 'Failed to load reference data', description: getApiError(err), type: 'error' })
-      )
-  }, [])
-
-  const itemById = (id: string) => itemsList.find(i => i.id === id)
-
-  const watchedItems = form.watch('items')
-  const trackingIncomplete = watchedItems.some(v => {
-    const p = trackingProgress(itemById(v.itemId), v.acceptedQuantity, v.serialText, v.batches)
-    return p !== null && !p.complete
-  })
-
-  async function onSubmit(values: FormValues) {
-    const items: GrnItemBody[] = []
-    for (const v of values.items) {
-      const info = itemById(v.itemId)
-      if (v.acceptedQuantity + v.rejectedQuantity <= 0) {
-        toast.add({ title: `${info?.sku ?? 'Line'}: enter a quantity.`, type: 'error' })
-        return
-      }
-      const payload = trackingPayload(info, v)
-      if ('error' in payload) {
-        toast.add({ title: `${info?.sku ?? 'Line'}: ${payload.error}`, type: 'error' })
-        return
-      }
-      items.push({
-        itemId: v.itemId,
-        acceptedQuantity: v.acceptedQuantity,
-        rejectedQuantity: v.rejectedQuantity,
-        ...payload,
-      })
-    }
-
-    try {
-      await grnApi.createDirect({
-        warehouseId: values.warehouseId,
-        supplierId: values.supplierId === NO_SUPPLIER ? undefined : values.supplierId,
-        receivedByUserId: values.receivedByUserId,
-        items,
-      })
-      toast.add({ title: 'Direct receipt recorded', type: 'success' })
-      router.push('/procurement/grn')
-    } catch (err) {
-      toast.add({ title: 'Failed to record receipt', description: getApiError(err), type: 'error' })
-    }
-  }
-
-  return (
-    <div className="flex max-w-4xl flex-col gap-6">
-      <div className="flex items-center gap-4">
-        <Button type="button" variant="outline" size="sm" onClick={goBack}>
-          <HugeiconsIcon icon={ArrowLeft01Icon} size={16} strokeWidth={2} />
-          Back
-        </Button>
-        <div>
-          <h1 className="text-2xl font-semibold text-foreground">Direct Receipt</h1>
-          <p className="text-sm text-muted-foreground">Receive stock into a warehouse without a purchase order.</p>
-        </div>
-      </div>
-
-      <form onSubmit={form.handleSubmit(onSubmit)} className="flex flex-col gap-6">
-          <FieldGroup>
-            <div className="grid gap-4 sm:grid-cols-2">
-              <FormField
-                control={form.control}
-                name="warehouseId"
-                label="Warehouse"
-                required
-                render={({ field }) => (
-                  <Select value={field.value as string} onValueChange={field.onChange}>
-                    <SelectTrigger>
-                      <SelectValue placeholder="Select warehouse..." />
-                    </SelectTrigger>
-                    <SelectContent>
-                      {warehousesList.map(w => (
-                        <SelectItem key={w.id} value={w.id}>{w.name}</SelectItem>
-                      ))}
-                    </SelectContent>
-                  </Select>
-                )}
-              />
-
-              <FormField
-                control={form.control}
-                name="supplierId"
-                label="Supplier (optional)"
-                render={({ field }) => (
-                  <Select value={field.value as string} onValueChange={field.onChange}>
-                    <SelectTrigger>
-                      <SelectValue placeholder="No supplier" />
-                    </SelectTrigger>
-                    <SelectContent>
-                      <SelectItem value={NO_SUPPLIER}>No supplier</SelectItem>
-                      {suppliersList.filter(s => s.isActive).map(s => (
-                        <SelectItem key={s.id} value={s.id}>{s.name}</SelectItem>
-                      ))}
-                    </SelectContent>
-                  </Select>
-                )}
-              />
-            </div>
-
-            <FormField
-              control={form.control}
-              name="receivedByUserId"
-              label="Received By"
-              description="Temporary — required until auth resolves the logged-in user automatically."
-              required
-              render={({ field }) => (
-                <Select value={field.value as string} onValueChange={field.onChange}>
-                  <SelectTrigger>
-                    <SelectValue placeholder="Select user..." />
-                  </SelectTrigger>
-                  <SelectContent>
-                    {usersList.map(user => (
-                      <SelectItem key={user.id} value={user.id}>{user.fullName}</SelectItem>
-                    ))}
-                  </SelectContent>
-                </Select>
-              )}
-            />
-          </FieldGroup>
-
-          <Separator />
-
-          <div className="flex flex-col gap-3">
-            <p className="text-sm font-medium text-foreground">Items</p>
-
-            {fields.map((f, index) => {
-              const v = watchedItems[index]
-              const info = v ? itemById(v.itemId) : undefined
-              return (
-                <div key={f.id} className="grid grid-cols-[1fr_90px_90px_auto] items-start gap-3 rounded-xl border px-3 py-3">
-                  <FormField
-                    control={form.control}
-                    name={`items.${index}.itemId`}
-                    render={({ field }) => (
-                      <Select
-                        value={field.value as string}
-                        onValueChange={val => {
-                          field.onChange(val)
-                          // A different item has different tracking rules — drop stale entries.
-                          form.setValue(`items.${index}.serialText`, '')
-                          form.setValue(`items.${index}.batches`, [])
-                        }}
-                      >
-                        <SelectTrigger>
-                          <SelectValue placeholder="Select item..." />
-                        </SelectTrigger>
-                        <SelectContent>
-                          {itemsList.filter(i => i.isActive).map(i => (
-                            <SelectItem key={i.id} value={i.id}>{i.sku} — {i.name}</SelectItem>
-                          ))}
-                        </SelectContent>
-                      </Select>
-                    )}
-                  />
-
-                  <FormField
-                    control={form.control}
-                    name={`items.${index}.acceptedQuantity`}
-                    render={({ field, invalid }) => (
-                      <Input
-                        type="number"
-                        min={0}
-                        placeholder="Accepted"
-                        value={Number(field.value as number)}
-                        onChange={e => field.onChange(Number(e.target.value))}
-                        onBlur={field.onBlur}
-                        aria-invalid={invalid}
-                      />
-                    )}
-                  />
-
-                  <FormField
-                    control={form.control}
-                    name={`items.${index}.rejectedQuantity`}
-                    render={({ field, invalid }) => (
-                      <Input
-                        type="number"
-                        min={0}
-                        placeholder="Rejected"
-                        value={Number(field.value as number)}
-                        onChange={e => field.onChange(Number(e.target.value))}
-                        onBlur={field.onBlur}
-                        aria-invalid={invalid}
-                      />
-                    )}
-                  />
-
-                  <Button
-                    type="button"
-                    variant="ghost"
-                    disabled={fields.length === 1}
-                    onClick={() => remove(index)}
-                  >
-                    Remove
-                  </Button>
-
-                  {info && v && (
-                    <LineTracking
-                      info={info}
-                      name={info.name}
-                      accepted={v.acceptedQuantity}
-                      serialText={v.serialText}
-                      batches={v.batches}
-                      onSerialText={val => form.setValue(`items.${index}.serialText`, val)}
-                      onBatches={val => form.setValue(`items.${index}.batches`, val, { shouldDirty: true })}
-                    />
-                  )}
-                </div>
-              )
-            })}
-
-            <div>
-              <Button type="button" variant="outline" onClick={() => append({ ...emptyLine })}>
-                Add item
-              </Button>
-            </div>
-          </div>
-
-          <div className="flex justify-end gap-2">
-            <Button type="button" variant="outline" onClick={goBack}>Cancel</Button>
-            <Button type="submit" disabled={form.formState.isSubmitting || trackingIncomplete}>
-              {form.formState.isSubmitting ? 'Saving…' : 'Record Receipt'}
-            </Button>
-          </div>
-        </form>
-    </div>
-  )
-}
@@ -0,0 +1,737 @@
+'use client'
+
+import { Fragment, useEffect, useState } from 'react'
+import { useRouter } from 'next/navigation'
+import { HugeiconsIcon } from '@hugeicons/react'
+import { ArrowLeft01Icon, Add01Icon, Delete02Icon } from '@hugeicons/core-free-icons'
+import { useFieldArray } from 'react-hook-form'
+import { useForm, zodResolver, z } from '@/lib/form'
+import { FormField } from '@/components/shared/form-field'
+import { Input } from '@/components/ui/input'
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from '@/components/ui/select'
+import { Button } from '@/components/ui/button'
+import { Field, FieldGroup, FieldLabel } from '@/components/ui/field'
+import { Separator } from '@/components/ui/separator'
+import { toast } from '@/components/ui/toast'
+import type { GrnItemBody } from '@/lib/api/procurement'
+import type { GrnTaxSettings } from '@/lib/api/sys-config'
+import {
+  grn as grnApi,
+  purchaseOrders as purchaseOrdersApi,
+  warehouses as warehousesApi,
+  users as usersApi,
+  suppliers as suppliersApi,
+  items as itemsApi,
+  grnTaxSettings,
+  DEFAULT_GRN_TAX_SETTINGS,
+  getApiError,
+  getPaginatedItems,
+} from '@/lib/api/index'
+import type {
+  PurchaseOrderResponse,
+  WarehouseResponse,
+  UserResponse,
+  SupplierResponse,
+  ItemSummaryResponse,
+} from '@/types/api'
+import { LineTracking, parseSerials, trackingPayload, trackingProgress } from '../_components/grn-tracking'
+import {
+  DISCOUNT_OPTIONS,
+  VAT_OPTIONS,
+  NBT_OPTIONS,
+  GrnTotals,
+  NumberCell,
+  PercentSelect,
+  batchSummary,
+  lineAmounts,
+  money,
+} from '../_components/grn-costing'
+
+const NO_SUPPLIER = 'none'
+
+type GrnMode = 'po' | 'direct'
+
+const percent = z.number().min(0, 'Min 0').max(100, 'Max 100')
+
+const lineSchema = z.object({
+  // Set when the line comes from a purchase order; empty on a direct line.
+  purchaseOrderItemId: z.string(),
+  itemId: z.string().min(1, 'Select an item'),
+  acceptedQuantity: z.number().min(0, 'Must be 0 or more'),
+  rejectedQuantity: z.number().min(0, 'Must be 0 or more'),
+  freeQuantity: z.number().min(0, 'Must be 0 or more'),
+  unitCost: z.number().min(0, 'Must be 0 or more'),
+  discountPercent: percent,
+  nbtPercent: percent,
+  vatPercent: percent,
+  // One serial number per line (newline or comma separated) — used for serial-tracked items.
+  serialText: z.string(),
+  // Used for batch- and/or expiry-tracked items.
+  batches: z.array(z.object({ batchNumber: z.string(), expiryDate: z.string(), quantity: z.number() })),
+})
+
+const schema = z.object({
+  warehouseId: z.string().min(1, 'Warehouse is required'),
+  supplierId: z.string(),
+  receivedAt: z.string().min(1, 'Received date is required'),
+  receivedByUserId: z.string().min(1, 'Received by is required'),
+  discountPercent: percent,
+  nbtPercent: percent,
+  vatPercent: percent,
+  items: z.array(lineSchema).min(1, 'Add at least one item'),
+})
+
+type FormValues = z.infer<typeof schema>
+
+const emptyLine = {
+  purchaseOrderItemId: '',
+  itemId: '',
+  acceptedQuantity: 1,
+  rejectedQuantity: 0,
+  freeQuantity: 0,
+  unitCost: 0,
+  discountPercent: 0,
+  nbtPercent: 0,
+  vatPercent: 0,
+  serialText: '',
+  batches: [],
+}
+
+function todayIso() {
+  return new Date().toISOString().slice(0, 10)
+}
+
+/**
+ * One GRN form for both ways of receiving goods. "Against PO" loads the order's lines and lets more
+ * lines be added from that order's items (e.g. a second batch); "Direct GRN" takes any catalogue item.
+ */
+export default function NewGrnPage() {
+  const router = useRouter()
+  const goBack = () => router.push('/procurement/grn')
+  const [warehousesList, setWarehousesList] = useState<WarehouseResponse[]>([])
+  const [usersList, setUsersList] = useState<UserResponse[]>([])
+  const [suppliersList, setSuppliersList] = useState<SupplierResponse[]>([])
+  const [itemsList, setItemsList] = useState<ItemSummaryResponse[]>([])
+  const [eligiblePOs, setEligiblePOs] = useState<PurchaseOrderResponse[]>([])
+  const [mode, setMode] = useState<GrnMode>('po')
+  const [poId, setPoId] = useState('')
+  const [selectedPO, setSelectedPO] = useState<PurchaseOrderResponse | null>(null)
+  const [loadingPO, setLoadingPO] = useState(false)
+  // Which taxes apply to a GRN, and whether each is mandatory (Configuration → GRN Taxes).
+  const [tax, setTax] = useState<GrnTaxSettings>(DEFAULT_GRN_TAX_SETTINGS)
+  const [taxBlank, setTaxBlank] = useState({ vat: false, nbt: false })
+  // Tracking flags for items loaded from a PO, keyed by itemId (the PO line response doesn't carry them).
+  const [poItemInfo, setPoItemInfo] = useState<Record<string, ItemSummaryResponse>>({})
+
+  const form = useForm<FormValues>({
+    resolver: zodResolver(schema),
+    defaultValues: {
+      warehouseId: '',
+      supplierId: NO_SUPPLIER,
+      receivedAt: todayIso(),
+      receivedByUserId: '',
+      discountPercent: 0,
+      nbtPercent: 0,
+      vatPercent: 0,
+      items: [{ ...emptyLine }],
+    },
+  })
+
+  const { fields, append, remove, replace } = useFieldArray({ control: form.control, name: 'items' })
+
+  useEffect(() => {
+    Promise.all([
+      warehousesApi.list({ pageSize: 200 }),
+      usersApi.list({ pageSize: 200 }),
+      suppliersApi.list(),
+      itemsApi.list({ pageSize: 200 }),
+      purchaseOrdersApi.list({ pageSize: 200 }),
+    ])
+      .then(([ws, us, ss, its, pos]) => {
+        setWarehousesList(getPaginatedItems(ws))
+        setUsersList(getPaginatedItems(us))
+        setSuppliersList(ss)
+        setItemsList(getPaginatedItems(its))
+        // Only POs that can still receive goods
+        const all = getPaginatedItems(pos) as PurchaseOrderResponse[]
+        setEligiblePOs(all.filter(po => po.status === 'Issued' || po.status === 'PartiallyReceived'))
+      })
+      .catch(err =>
+        toast.add({ title: 'Failed to load reference data', description: getApiError(err), type: 'error' })
+      )
+
+    // New GRNs start from the configured default rates; a disabled tax stays at 0.
+    grnTaxSettings
+      .get()
+      .then(t => {
+        setTax(t)
+        applyToAllLines('vatPercent', t.vatMode === 'Disabled' ? 0 : t.vatDefaultRate)
+        applyToAllLines('nbtPercent', t.nbtMode === 'Disabled' ? 0 : t.nbtDefaultRate)
+      })
+      .catch(err =>
+        toast.add({ title: 'Failed to load GRN tax settings', description: getApiError(err), type: 'error' })
+      )
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [])
+
+  const isPoMode = mode === 'po'
+  const vatOn = tax.vatMode !== 'Disabled'
+  const nbtOn = tax.nbtMode !== 'Disabled'
+  const colCount = 9 + (vatOn ? 1 : 0) + (nbtOn ? 1 : 0)
+  const infoFor = (itemId: string) => poItemInfo[itemId] ?? itemsList.find(i => i.id === itemId)
+  const poLines = selectedPO?.items?.filter(i => !i.isCancelled) ?? []
+  const poLine = (poItemId: string) => poLines.find(i => i.id === poItemId)
+
+  const watchedItems = form.watch('items')
+  const headerDiscount = form.watch('discountPercent')
+  const headerVat = form.watch('vatPercent')
+  const headerNbt = form.watch('nbtPercent')
+  // Block Save until every tracked line has its serials/batches fully entered (accepted + free units).
+  const trackingIncomplete = watchedItems.some(v => {
+    const p = trackingProgress(infoFor(v.itemId), v.acceptedQuantity + v.freeQuantity, v.serialText, v.batches)
+    return p !== null && !p.complete
+  })
+
+  // The GRN-wide percentage is a default: choosing one fills every line, and a line can still be edited.
+  function applyToAllLines(field: 'discountPercent' | 'vatPercent' | 'nbtPercent', value: number) {
+    form.setValue(field, value, { shouldDirty: true })
+    form.getValues('items').forEach((_, i) => form.setValue(`items.${i}.${field}`, value, { shouldDirty: true }))
+  }
+
+  function changeMode(next: GrnMode) {
+    if (next === mode) return
+    setMode(next)
+    setPoId('')
+    setSelectedPO(null)
+    const discountPercent = form.getValues('discountPercent')
+    const vatPercent = form.getValues('vatPercent')
+    const nbtPercent = form.getValues('nbtPercent')
+    // Direct starts with one blank line; Against PO stays empty until an order is picked.
+    form.setValue('supplierId', NO_SUPPLIER)
+    replace(next === 'direct' ? [{ ...emptyLine, discountPercent, vatPercent, nbtPercent }] : [])
+  }
+
+  // A line in PO mode points at one of the order's lines; re-picking resets the cost and tracking.
+  function selectPoLine(index: number, poItemId: string) {
+    const line = poLine(poItemId)
+    if (!line) return
+    form.setValue(`items.${index}.purchaseOrderItemId`, poItemId, { shouldValidate: true })
+    form.setValue(`items.${index}.itemId`, line.itemId, { shouldValidate: true })
+    form.setValue(`items.${index}.unitCost`, line.unitCost)
+    form.setValue(`items.${index}.serialText`, '')
+    form.setValue(`items.${index}.batches`, [])
+  }
+
+  async function handlePOChange(nextId: string) {
+    setPoId(nextId)
+    const discountPercent = form.getValues('discountPercent')
+    const vatPercent = form.getValues('vatPercent')
+    const nbtPercent = form.getValues('nbtPercent')
+
+    setLoadingPO(true)
+    try {
+      const po = await purchaseOrdersApi.get(nextId)
+      const activeLines = (po.items ?? []).filter(item => !item.isCancelled)
+
+      const itemIds = [...new Set(activeLines.map(l => l.itemId))]
+      const details = await Promise.all(itemIds.map(id => itemsApi.get(id)))
+      setPoItemInfo(Object.fromEntries(details.map(d => [d.id, d])))
+
+      setSelectedPO(po)
+      form.setValue('supplierId', po.supplierId)
+      // Pre-fill each non-cancelled line with its remaining quantity and the PO's unit cost.
+      replace(
+        activeLines.map(item => ({
+          ...emptyLine,
+          purchaseOrderItemId: item.id,
+          itemId: item.itemId,
+          acceptedQuantity: Math.max(0, item.quantity - item.receivedQuantity),
+          unitCost: item.unitCost,
+          discountPercent,
+          vatPercent,
+          nbtPercent,
+        })),
+      )
+    } catch (err) {
+      toast.add({ title: 'Failed to load PO details', description: getApiError(err), type: 'error' })
+      setPoId('')
+      setSelectedPO(null)
+      replace([])
+    } finally {
+      setLoadingPO(false)
+    }
+  }
+
+  async function onSubmit(values: FormValues) {
+    if (isPoMode && !selectedPO) {
+      toast.add({ title: 'Select a purchase order.', type: 'error' })
+      return
+    }
+    const items: GrnItemBody[] = []
+    for (const v of values.items) {
+      const info = infoFor(v.itemId)
+      const label = info?.sku ?? 'Line'
+      if (isPoMode && !v.purchaseOrderItemId) {
+        toast.add({ title: 'Select an item for every line.', type: 'error' })
+        return
+      }
+      if (v.acceptedQuantity + v.rejectedQuantity + v.freeQuantity <= 0) {
+        toast.add({ title: `${label}: enter a quantity.`, type: 'error' })
+        return
+      }
+      const payload = trackingPayload(info, { ...v, acceptedQuantity: v.acceptedQuantity + v.freeQuantity })
+      if ('error' in payload) {
+        toast.add({ title: `${label}: ${payload.error}`, type: 'error' })
+        return
+      }
+      items.push({
+        ...(isPoMode ? { purchaseOrderItemId: v.purchaseOrderItemId } : { itemId: v.itemId }),
+        acceptedQuantity: v.acceptedQuantity,
+        rejectedQuantity: v.rejectedQuantity,
+        freeQuantity: v.freeQuantity,
+        unitCost: v.unitCost,
+        discountPercent: v.discountPercent,
+        ...(vatOn ? { vatPercent: v.vatPercent } : {}),
+        ...(nbtOn ? { nbtPercent: v.nbtPercent } : {}),
+        ...payload,
+      })
+    }
+
+    try {
+      if (isPoMode && selectedPO) {
+        await grnApi.create({
+          purchaseOrderId: selectedPO.id,
+          warehouseId: values.warehouseId,
+          receivedAt: `${values.receivedAt}T00:00:00.000Z`,
+          items,
+          discountPercent: values.discountPercent,
+          ...(vatOn ? { vatPercent: values.vatPercent } : {}),
+          ...(nbtOn ? { nbtPercent: values.nbtPercent } : {}),
+          receivedByUserId: values.receivedByUserId,
+        })
+      } else {
+        await grnApi.createDirect({
+          warehouseId: values.warehouseId,
+          supplierId: values.supplierId === NO_SUPPLIER ? undefined : values.supplierId,
+          receivedByUserId: values.receivedByUserId,
+          discountPercent: values.discountPercent,
+          ...(vatOn ? { vatPercent: values.vatPercent } : {}),
+          ...(nbtOn ? { nbtPercent: values.nbtPercent } : {}),
+          items,
+        })
+      }
+      toast.add({ title: 'Goods receipt recorded', type: 'success' })
+      router.push('/procurement/grn')
+    } catch (err) {
+      toast.add({ title: 'Failed to record receipt', description: getApiError(err), type: 'error' })
+    }
+  }
+
+  return (
+    <div className="flex w-full flex-col gap-6">
+      <div className="flex items-center gap-4">
+        <Button type="button" variant="outline" size="sm" onClick={goBack}>
+          <HugeiconsIcon icon={ArrowLeft01Icon} size={16} strokeWidth={2} />
+          Back
+        </Button>
+        <div>
+          <h1 className="text-2xl font-semibold text-foreground">New GRN</h1>
+          <p className="text-sm text-muted-foreground">
+            Receive stock into a warehouse. Pick a purchase order to receive against it, or leave it as direct.
+          </p>
+        </div>
+      </div>
+
+      <form onSubmit={form.handleSubmit(onSubmit)} className="flex flex-col gap-6">
+        <FieldGroup>
+          <Field>
+            <FieldLabel>Receipt Type</FieldLabel>
+            <div className="flex gap-2">
+              <Button
+                type="button"
+                size="sm"
+                variant={isPoMode ? 'default' : 'outline'}
+                onClick={() => changeMode('po')}
+              >
+                Against PO
+              </Button>
+              <Button
+                type="button"
+                size="sm"
+                variant={!isPoMode ? 'default' : 'outline'}
+                onClick={() => changeMode('direct')}
+              >
+                Direct GRN
+              </Button>
+            </div>
+          </Field>
+
+          {isPoMode && (
+            <Field>
+              <FieldLabel>
+                Purchase Order<span className="text-destructive"> *</span>
+              </FieldLabel>
+              <Select value={poId} onValueChange={v => v && handlePOChange(v)}>
+                <SelectTrigger>
+                  <SelectValue placeholder="Select purchase order..." />
+                </SelectTrigger>
+                <SelectContent>
+                  {eligiblePOs.map(po => (
+                    <SelectItem key={po.id} value={po.id}>
+                      {po.supplierName} — {po.id.slice(0, 8).toUpperCase()} ({po.status})
+                    </SelectItem>
+                  ))}
+                </SelectContent>
+              </Select>
+            </Field>
+          )}
+
+          <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-4">
+            <FormField
+              control={form.control}
+              name="warehouseId"
+              label="Warehouse"
+              required
+              render={({ field }) => (
+                <Select value={field.value as string} onValueChange={field.onChange}>
+                  <SelectTrigger>
+                    <SelectValue placeholder="Select warehouse..." />
+                  </SelectTrigger>
+                  <SelectContent>
+                    {warehousesList.map(w => (
+                      <SelectItem key={w.id} value={w.id}>{w.name}</SelectItem>
+                    ))}
+                  </SelectContent>
+                </Select>
+              )}
+            />
+
+            {isPoMode ? (
+              <Field>
+                <FieldLabel>Supplier</FieldLabel>
+                <Input value={selectedPO?.supplierName ?? ''} disabled readOnly />
+              </Field>
+            ) : (
+              <FormField
+                control={form.control}
+                name="supplierId"
+                label="Supplier (optional)"
+                render={({ field }) => (
+                  <Select value={field.value as string} onValueChange={field.onChange}>
+                    <SelectTrigger>
+                      <SelectValue placeholder="No supplier" />
+                    </SelectTrigger>
+                    <SelectContent>
+                      <SelectItem value={NO_SUPPLIER}>No supplier</SelectItem>
+                      {suppliersList.filter(s => s.isActive).map(s => (
+                        <SelectItem key={s.id} value={s.id}>{s.name}</SelectItem>
+                      ))}
+                    </SelectContent>
+                  </Select>
+                )}
+              />
+            )}
+
+            {isPoMode && (
+              <FormField
+                control={form.control}
+                name="receivedAt"
+                label="Received Date"
+                required
+                render={({ field, invalid }) => (
+                  <Input
+                    type="date"
+                    value={field.value as string}
+                    onChange={field.onChange}
+                    onBlur={field.onBlur}
+                    aria-invalid={invalid}
+                  />
+                )}
+              />
+            )}
+
+            <PercentSelect
+              label="GRN Discount %"
+              value={headerDiscount}
+              options={DISCOUNT_OPTIONS}
+              onChange={v => applyToAllLines('discountPercent', v)}
+            />
+
+            {nbtOn && (
+              <PercentSelect
+                label="GRN NBT %"
+                value={headerNbt}
+                options={NBT_OPTIONS}
+                required={tax.nbtMode === 'Mandatory'}
+                onBlankChange={blank => setTaxBlank(b => ({ ...b, nbt: blank }))}
+                onChange={v => applyToAllLines('nbtPercent', v)}
+              />
+            )}
+
+            {vatOn && (
+              <PercentSelect
+                label="GRN VAT %"
+                value={headerVat}
+                options={VAT_OPTIONS}
+                required={tax.vatMode === 'Mandatory'}
+                onBlankChange={blank => setTaxBlank(b => ({ ...b, vat: blank }))}
+                onChange={v => applyToAllLines('vatPercent', v)}
+              />
+            )}
+          </div>
+
+          <FormField
+            control={form.control}
+            name="receivedByUserId"
+            label="Received By"
+            description="Temporary — required until auth resolves the logged-in user automatically."
+            required
+            render={({ field }) => (
+              <Select value={field.value as string} onValueChange={field.onChange}>
+                <SelectTrigger>
+                  <SelectValue placeholder="Select user..." />
+                </SelectTrigger>
+                <SelectContent>
+                  {usersList.map(user => (
+                    <SelectItem key={user.id} value={user.id}>{user.fullName}</SelectItem>
+                  ))}
+                </SelectContent>
+              </Select>
+            )}
+          />
+        </FieldGroup>
+
+        <Separator />
+
+        <div className="flex flex-col gap-3">
+          <div className="flex items-start justify-between gap-4">
+            <div>
+              <p className="text-sm font-medium text-foreground">Items</p>
+              <p className="text-sm text-muted-foreground">
+                {isPoMode
+                  ? 'Lines start from the purchase order. Add Item adds another line from the same order (e.g. a second batch). Unit cost starts at the PO price; change it if the supplier invoiced differently.'
+                  : 'Add each received item as its own line.'}{' '}
+                GRN discount %{nbtOn ? ', NBT %' : ''}{vatOn ? ' and VAT %' : ''} fill every line; edit a line to override it. Only accepted units are costed;
+                free units are stocked at no cost.
+              </p>
+            </div>
+            <Button
+              type="button"
+              variant="outline"
+              size="sm"
+              disabled={isPoMode && !selectedPO}
+              onClick={() =>
+                append({ ...emptyLine, discountPercent: headerDiscount, vatPercent: headerVat, nbtPercent: headerNbt })
+              }
+            >
+              <HugeiconsIcon icon={Add01Icon} size={16} />
+              Add Item
+            </Button>
+          </div>
+
+          {loadingPO ? (
+            <p className="text-sm text-muted-foreground">Loading items…</p>
+          ) : isPoMode && !selectedPO ? (
+            <p className="text-sm text-muted-foreground">Select a purchase order to load its items.</p>
+          ) : fields.length === 0 ? (
+            <p className="text-sm text-muted-foreground">
+              {isPoMode ? 'No receivable items left. Use Add Item to add a line.' : 'Add an item to begin.'}
+            </p>
+          ) : (
+            <>
+              <div className="overflow-x-auto rounded-xl border">
+                <table className="w-full text-sm">
+                  <thead className="bg-muted/50">
+                    <tr>
+                      <th className="min-w-[220px] px-3 py-2 text-left font-medium">Item</th>
+                      <th className="min-w-[120px] px-3 py-2 text-left font-medium">Batch No</th>
+                      <th className="w-24 px-3 py-2 text-left font-medium">Accepted</th>
+                      <th className="w-24 px-3 py-2 text-left font-medium">Rejected</th>
+                      <th className="w-24 px-3 py-2 text-left font-medium">Free Qty</th>
+                      <th className="w-28 px-3 py-2 text-left font-medium">Unit Cost</th>
+                      <th className="w-24 px-3 py-2 text-left font-medium">Disc %</th>
+                      {nbtOn && <th className="w-24 px-3 py-2 text-left font-medium">NBT %</th>}
+                      {vatOn && <th className="w-24 px-3 py-2 text-left font-medium">VAT %</th>}
+                      <th className="w-32 px-3 py-2 text-right font-medium">Line Total</th>
+                      <th className="w-16 px-3 py-2"></th>
+                    </tr>
+                  </thead>
+                  <tbody>
+                    {fields.map((f, index) => {
+                      const v = watchedItems[index]
+                      const info = v ? infoFor(v.itemId) : undefined
+                      const po = v?.purchaseOrderItemId ? poLine(v.purchaseOrderItemId) : undefined
+                      const amounts = lineAmounts({
+                        acceptedQuantity: v?.acceptedQuantity ?? 0,
+                        unitCost: v?.unitCost ?? 0,
+                        discountPercent: v?.discountPercent ?? 0,
+                        nbtPercent: nbtOn ? (v?.nbtPercent ?? 0) : 0,
+                        vatPercent: vatOn ? (v?.vatPercent ?? 0) : 0,
+                      })
+                      return (
+                        <Fragment key={f.id}>
+                          <tr className="border-t align-top">
+                            <td className="px-3 py-2">
+                              {isPoMode ? (
+                                <FormField
+                                  control={form.control}
+                                  name={`items.${index}.itemId`}
+                                  render={() => (
+                                    <Select
+                                      value={v?.purchaseOrderItemId ?? ''}
+                                      onValueChange={val => val && selectPoLine(index, val)}
+                                    >
+                                      <SelectTrigger>
+                                        <SelectValue placeholder="Select PO item...">
+                                          {po ? `${po.sku} — ${po.itemName}` : undefined}
+                                        </SelectValue>
+                                      </SelectTrigger>
+                                      <SelectContent>
+                                        {poLines.map(l => (
+                                          <SelectItem key={l.id} value={l.id}>
+                                            {l.sku} — {l.itemName} (ordered {l.quantity}, received {l.receivedQuantity})
+                                          </SelectItem>
+                                        ))}
+                                      </SelectContent>
+                                    </Select>
+                                  )}
+                                />
+                              ) : (
+                                <FormField
+                                  control={form.control}
+                                  name={`items.${index}.itemId`}
+                                  render={({ field }) => (
+                                    <Select
+                                      value={field.value as string}
+                                      onValueChange={val => {
+                                        field.onChange(val)
+                                        // A different item has different tracking rules — drop stale entries.
+                                        form.setValue(`items.${index}.serialText`, '')
+                                        form.setValue(`items.${index}.batches`, [])
+                                      }}
+                                    >
+                                      <SelectTrigger>
+                                        <SelectValue placeholder="Select item..." />
+                                      </SelectTrigger>
+                                      <SelectContent>
+                                        {itemsList.filter(i => i.isActive).map(i => (
+                                          <SelectItem key={i.id} value={i.id}>{i.sku} — {i.name}</SelectItem>
+                                        ))}
+                                      </SelectContent>
+                                    </Select>
+                                  )}
+                                />
+                              )}
+                            </td>
+
+                            <td className="px-3 py-3 text-muted-foreground">
+                              {batchSummary(info, v?.batches ?? [], v?.serialText ?? '')}
+                            </td>
+
+                            <td className="px-3 py-2">
+                              <NumberCell control={form.control} name={`items.${index}.acceptedQuantity`} />
+                            </td>
+                            <td className="px-3 py-2">
+                              <NumberCell control={form.control} name={`items.${index}.rejectedQuantity`} />
+                            </td>
+                            <td className="px-3 py-2">
+                              <NumberCell control={form.control} name={`items.${index}.freeQuantity`} />
+                            </td>
+                            <td className="px-3 py-2">
+                              <NumberCell control={form.control} name={`items.${index}.unitCost`} step={0.01} />
+                            </td>
+                            <td className="px-3 py-2">
+                              <NumberCell control={form.control} name={`items.${index}.discountPercent`} step={0.01} max={100} />
+                            </td>
+                            {nbtOn && (
+                              <td className="px-3 py-2">
+                                <NumberCell control={form.control} name={`items.${index}.nbtPercent`} step={0.01} max={100} />
+                              </td>
+                            )}
+                            {vatOn && (
+                              <td className="px-3 py-2">
+                                <NumberCell control={form.control} name={`items.${index}.vatPercent`} step={0.01} max={100} />
+                              </td>
+                            )}
+
+                            <td className="px-3 py-3 text-right font-medium">{money(amounts.total)}</td>
+
+                            <td className="px-3 py-2 text-right">
+                              <Button
+                                type="button"
+                                variant="outline"
+                                size="sm"
+                                aria-label="Delete item"
+                                title="Delete item"
+                                disabled={fields.length === 1}
+                                onClick={() => remove(index)}
+                              >
+                                <HugeiconsIcon icon={Delete02Icon} size={16} />
+                              </Button>
+                            </td>
+                          </tr>
+
+                          {info && v && (
+                            <tr>
+                              <td colSpan={colCount} className="px-3 pb-3">
+                                <LineTracking
+                                  info={info}
+                                  name={info.name}
+                                  accepted={v.acceptedQuantity + v.freeQuantity}
+                                  otherSerials={watchedItems.flatMap((o, j) =>
+                                    j !== index && o.itemId === v.itemId ? parseSerials(o.serialText) : [],
+                                  )}
+                                  serialText={v.serialText}
+                                  batches={v.batches}
+                                  onSerialText={val => form.setValue(`items.${index}.serialText`, val)}
+                                  onBatches={val => form.setValue(`items.${index}.batches`, val, { shouldDirty: true })}
+                                />
+                              </td>
+                            </tr>
+                          )}
+                        </Fragment>
+                      )
+                    })}
+                  </tbody>
+                </table>
+              </div>
+
+              <GrnTotals
+                lines={watchedItems.map(v => ({
+                  ...v,
+                  nbtPercent: nbtOn ? v.nbtPercent : 0,
+                  vatPercent: vatOn ? v.vatPercent : 0,
+                }))}
+                showNbt={nbtOn}
+                showVat={vatOn}
+              />
+            </>
+          )}
+        </div>
+
+        <div className="flex justify-end gap-2">
+          <Button type="button" variant="outline" onClick={goBack}>Cancel</Button>
+          <Button
+            type="submit"
+            disabled={
+              form.formState.isSubmitting ||
+              loadingPO ||
+              fields.length === 0 ||
+              trackingIncomplete ||
+              (tax.vatMode === 'Mandatory' && taxBlank.vat) ||
+              (tax.nbtMode === 'Mandatory' && taxBlank.nbt)
+            }
+          >
+            {form.formState.isSubmitting ? 'Saving…' : 'Record Receipt'}
+          </Button>
+        </div>
+      </form>
+    </div>
+  )
+}
@@ -1,383 +0,0 @@
-'use client'
-
-import { useEffect, useState } from 'react'
-import { useRouter } from 'next/navigation'
-import { HugeiconsIcon } from '@hugeicons/react'
-import { ArrowLeft01Icon } from '@hugeicons/core-free-icons'
-import { useFieldArray } from 'react-hook-form'
-import { useForm, zodResolver, z } from '@/lib/form'
-import { FormField } from '@/components/shared/form-field'
-import { Input } from '@/components/ui/input'
-import {
-  Select,
-  SelectContent,
-  SelectItem,
-  SelectTrigger,
-  SelectValue,
-} from '@/components/ui/select'
-import { Button } from '@/components/ui/button'
-import { FieldGroup } from '@/components/ui/field'
-import { Separator } from '@/components/ui/separator'
-import { toast } from '@/components/ui/toast'
-import type { GrnItemBody } from '@/lib/api/procurement'
-import { LineTracking, trackingPayload, trackingProgress } from '../../_components/grn-tracking'
-import {
-  grn as grnApi,
-  purchaseOrders as purchaseOrdersApi,
-  warehouses as warehousesApi,
-  users as usersApi,
-  items as itemsApi,
-  getApiError,
-  getPaginatedItems,
-} from '@/lib/api/index'
-import type {
-  PurchaseOrderResponse,
-  WarehouseResponse,
-  UserResponse,
-  ItemSummaryResponse,
-} from '@/types/api'
-
-const batchLineSchema = z.object({
-  batchNumber: z.string(),
-  expiryDate: z.string(),
-  quantity: z.number(),
-})
-
-const grnItemSchema = z.object({
-  purchaseOrderItemId: z.string().min(1),
-  acceptedQuantity: z.number().min(0, 'Must be 0 or more'),
-  rejectedQuantity: z.number().min(0, 'Must be 0 or more'),
-  // One serial number per line (newline or comma separated) — used for serial-tracked items.
-  serialText: z.string(),
-  // Used for batch- and/or expiry-tracked items.
-  batches: z.array(batchLineSchema),
-})
-
-const schema = z.object({
-  purchaseOrderId: z.string().min(1, 'Purchase order is required'),
-  warehouseId: z.string().min(1, 'Warehouse is required'),
-  receivedAt: z.string().min(1, 'Received date is required'),
-  receivedByUserId: z.string().min(1, 'Received by is required'),
-  items: z.array(grnItemSchema).min(1, 'PO must have at least one line item'),
-})
-
-type FormValues = z.infer<typeof schema>
-
-function todayIso() {
-  return new Date().toISOString().slice(0, 10)
-}
-
-export default function NewPoGrnPage() {
-  const router = useRouter()
-  const goBack = () => router.push('/procurement/grn')
-  const [eligiblePOs, setEligiblePOs] = useState<PurchaseOrderResponse[]>([])
-  const [warehousesList, setWarehousesList] = useState<WarehouseResponse[]>([])
-  const [usersList, setUsersList] = useState<UserResponse[]>([])
-  const [selectedPO, setSelectedPO] = useState<PurchaseOrderResponse | null>(null)
-  const [loadingPO, setLoadingPO] = useState(false)
-  // Tracking flags per catalogue item, keyed by itemId — the PO line response doesn't carry them.
-  const [itemInfo, setItemInfo] = useState<Record<string, ItemSummaryResponse>>({})
-
-  const form = useForm<FormValues>({
-    resolver: zodResolver(schema),
-    defaultValues: {
-      purchaseOrderId: '',
-      warehouseId: '',
-      receivedAt: todayIso(),
-      receivedByUserId: '',
-      items: [],
-    },
-  })
-
-  const { fields, replace } = useFieldArray({ control: form.control, name: 'items' })
-
-  const poItems = selectedPO?.items?.filter(i => !i.isCancelled) ?? []
-
-  // Block Save until every tracked line has its serials/batches fully entered.
-  const watchedItems = form.watch('items')
-  const trackingIncomplete = watchedItems.some((v, i) => {
-    const info = poItems[i] ? itemInfo[poItems[i].itemId] : undefined
-    const p = trackingProgress(info, v.acceptedQuantity, v.serialText, v.batches)
-    return p !== null && !p.complete
-  })
-
-  // Load reference data on mount
-  useEffect(() => {
-    Promise.all([
-      purchaseOrdersApi.list({ pageSize: 200 }),
-      warehousesApi.list({ pageSize: 200 }),
-      usersApi.list({ pageSize: 200 }),
-    ])
-      .then(([pos, ws, usersRes]) => {
-        // Only POs that can still receive goods
-        const pos_ = getPaginatedItems(pos) as PurchaseOrderResponse[]
-        setEligiblePOs(pos_.filter(po => po.status === 'Issued' || po.status === 'PartiallyReceived'))
-        setWarehousesList(getPaginatedItems(ws))
-        setUsersList(getPaginatedItems(usersRes))
-      })
-      .catch(err =>
-        toast.add({ title: 'Failed to load reference data', description: getApiError(err), type: 'error' })
-      )
-  }, [])
-
-  // When PO changes, fetch its details and populate items
-  async function handlePOChange(poId: string) {
-    form.setValue('purchaseOrderId', poId, { shouldValidate: true })
-    if (!poId) {
-      setSelectedPO(null)
-      replace([])
-      return
-    }
-    setLoadingPO(true)
-    try {
-      const po = await purchaseOrdersApi.get(poId)
-      const activeLines = (po.items ?? []).filter(item => !item.isCancelled)
-
-      const itemIds = [...new Set(activeLines.map(l => l.itemId))]
-      const details = await Promise.all(itemIds.map(id => itemsApi.get(id)))
-      setItemInfo(Object.fromEntries(details.map(d => [d.id, d])))
-
-      setSelectedPO(po)
-      // Pre-fill items: remaining quantity for each non-cancelled line
-      const lineItems = activeLines.map(item => ({
-        purchaseOrderItemId: item.id,
-        acceptedQuantity: Math.max(0, item.quantity - item.receivedQuantity),
-        rejectedQuantity: 0,
-        serialText: '',
-        batches: [],
-      }))
-      replace(lineItems)
-    } catch (err) {
-      toast.add({ title: 'Failed to load PO details', description: getApiError(err), type: 'error' })
-    } finally {
-      setLoadingPO(false)
-    }
-  }
-
-  function buildItems(values: FormValues, lines: typeof poItems): GrnItemBody[] | null {
-    const result: GrnItemBody[] = []
-    for (let i = 0; i < values.items.length; i++) {
-      const v = values.items[i]
-      const line = lines[i]
-      const payload = trackingPayload(line ? itemInfo[line.itemId] : undefined, v)
-      if ('error' in payload) {
-        toast.add({ title: `${line?.sku ?? `line ${i + 1}`}: ${payload.error}`, type: 'error' })
-        return null
-      }
-      result.push({
-        purchaseOrderItemId: v.purchaseOrderItemId,
-        acceptedQuantity: v.acceptedQuantity,
-        rejectedQuantity: v.rejectedQuantity,
-        ...payload,
-      })
-    }
-    return result
-  }
-
-  async function onSubmit(values: FormValues) {
-    const items = buildItems(values, poItems)
-    if (!items) return
-    try {
-      await grnApi.create({
-        purchaseOrderId: values.purchaseOrderId,
-        warehouseId: values.warehouseId,
-        receivedAt: `${values.receivedAt}T00:00:00.000Z`,
-        items,
-        receivedByUserId: values.receivedByUserId,
-      })
-      toast.add({ title: 'Goods receipt recorded', type: 'success' })
-      router.push('/procurement/grn')
-    } catch (err) {
-      toast.add({ title: 'Failed to record receipt', description: getApiError(err), type: 'error' })
-    }
-  }
-
-  return (
-    <div className="flex max-w-4xl flex-col gap-6">
-      <div className="flex items-center gap-4">
-        <Button type="button" variant="outline" size="sm" onClick={goBack}>
-          <HugeiconsIcon icon={ArrowLeft01Icon} size={16} strokeWidth={2} />
-          Back
-        </Button>
-        <div>
-          <h1 className="text-2xl font-semibold text-foreground">Receipt Against PO</h1>
-          <p className="text-sm text-muted-foreground">Record stock received into a warehouse against an issued purchase order.</p>
-        </div>
-      </div>
-
-      <form onSubmit={form.handleSubmit(onSubmit)} className="flex flex-col gap-6 rounded-2xl border p-6">
-          <FieldGroup>
-            <FormField
-              control={form.control}
-              name="purchaseOrderId"
-              label="Purchase Order"
-              required
-              render={({ field }) => (
-                <Select
-                  value={field.value as string}
-                  onValueChange={v => handlePOChange(v ?? '')}
-                >
-                  <SelectTrigger>
-                    <SelectValue placeholder="Select purchase order..." />
-                  </SelectTrigger>
-                  <SelectContent>
-                    {eligiblePOs.map(po => (
-                      <SelectItem key={po.id} value={po.id}>
-                        {po.supplierName} — {po.id.slice(0, 8).toUpperCase()} ({po.status})
-                      </SelectItem>
-                    ))}
-                  </SelectContent>
-                </Select>
-              )}
-            />
-
-            <div className="grid gap-4 sm:grid-cols-2">
-              <FormField
-                control={form.control}
-                name="warehouseId"
-                label="Warehouse"
-                required
-                render={({ field }) => (
-                  <Select value={field.value as string} onValueChange={field.onChange}>
-                    <SelectTrigger>
-                      <SelectValue placeholder="Select warehouse..." />
-                    </SelectTrigger>
-                    <SelectContent>
-                      {warehousesList.map(w => (
-                        <SelectItem key={w.id} value={w.id}>{w.name}</SelectItem>
-                      ))}
-                    </SelectContent>
-                  </Select>
-                )}
-              />
-
-              <FormField
-                control={form.control}
-                name="receivedAt"
-                label="Received Date"
-                required
-                render={({ field, invalid }) => (
-                  <Input
-                    type="date"
-                    value={field.value as string}
-                    onChange={field.onChange}
-                    onBlur={field.onBlur}
-                    aria-invalid={invalid}
-                  />
-                )}
-              />
-            </div>
-
-            <FormField
-              control={form.control}
-              name="receivedByUserId"
-              label="Received By"
-              description="Temporary — required until auth resolves the logged-in user automatically."
-              required
-              render={({ field }) => (
-                <Select value={field.value as string} onValueChange={field.onChange}>
-                  <SelectTrigger>
-                    <SelectValue placeholder="Select user..." />
-                  </SelectTrigger>
-                  <SelectContent>
-                    <SelectItem value="" disabled>Select user...</SelectItem>
-                    {usersList.map((user) => (
-                      <SelectItem key={user.id} value={user.id}>{user.fullName}</SelectItem>
-                    ))}
-                  </SelectContent>
-                </Select>
-              )}
-            />
-          </FieldGroup>
-
-          {/* Line items — populated from the selected PO */}
-          {selectedPO && (
-            <>
-              <Separator />
-              <div className="flex flex-col gap-3">
-                <p className="text-sm font-medium text-foreground">Line Items</p>
-
-                {loadingPO ? (
-                  <p className="text-sm text-muted-foreground">Loading items…</p>
-                ) : poItems.length === 0 ? (
-                  <p className="text-sm text-muted-foreground">No receivable items on this order.</p>
-                ) : (
-                  <>
-                    {/* Header row */}
-                    <div className="grid grid-cols-[1fr_100px_100px] gap-3 px-1">
-                      <p className="text-xs font-medium text-muted-foreground">Item</p>
-                      <p className="text-xs font-medium text-muted-foreground">Accepted</p>
-                      <p className="text-xs font-medium text-muted-foreground">Rejected</p>
-                    </div>
-
-                    {fields.map((f, index) => {
-                      const poItem = poItems[index]
-                      return (
-                        <div key={f.id} className="grid grid-cols-[1fr_100px_100px] items-start gap-3 rounded-xl border px-3 py-3">
-                          <div className="flex flex-col gap-0.5 pt-1">
-                            <span className="text-sm font-medium">{poItem?.itemName}</span>
-                            <span className="text-xs text-muted-foreground">
-                              {poItem?.sku} · ordered {poItem?.quantity}, received {poItem?.receivedQuantity}
-                            </span>
-                          </div>
-
-                          <FormField
-                            control={form.control}
-                            name={`items.${index}.acceptedQuantity`}
-                            render={({ field, invalid }) => (
-                              <Input
-                                type="number"
-                                min={0}
-                                value={Number(field.value as number)}
-                                onChange={e => field.onChange(Number(e.target.value))}
-                                onBlur={field.onBlur}
-                                aria-invalid={invalid}
-                              />
-                            )}
-                          />
-
-                          <FormField
-                            control={form.control}
-                            name={`items.${index}.rejectedQuantity`}
-                            render={({ field, invalid }) => (
-                              <Input
-                                type="number"
-                                min={0}
-                                value={Number(field.value as number)}
-                                onChange={e => field.onChange(Number(e.target.value))}
-                                onBlur={field.onBlur}
-                                aria-invalid={invalid}
-                              />
-                            )}
-                          />
-
-                          {poItem && itemInfo[poItem.itemId] && (
-                            <LineTracking
-                              info={itemInfo[poItem.itemId]}
-                              name={poItem.itemName}
-                              accepted={form.watch(`items.${index}.acceptedQuantity`)}
-                              serialText={form.watch(`items.${index}.serialText`)}
-                              batches={form.watch(`items.${index}.batches`)}
-                              onSerialText={v => form.setValue(`items.${index}.serialText`, v)}
-                              onBatches={v => form.setValue(`items.${index}.batches`, v, { shouldDirty: true })}
-                            />
-                          )}
-                        </div>
-                      )
-                    })}
-                  </>
-                )}
-              </div>
-            </>
-          )}
-
-          <div className="flex justify-end gap-2">
-            <Button type="button" variant="outline" onClick={goBack}>Cancel</Button>
-            <Button type="submit" disabled={form.formState.isSubmitting || fields.length === 0 || trackingIncomplete}>
-              {form.formState.isSubmitting ? 'Saving…' : 'Record Receipt'}
-            </Button>
-          </div>
-        </form>
-    </div>
-  )
-}
@@ -11,7 +11,7 @@ export { stock } from './stock'
 export { productReports } from './reports'
 export { shopPos, invoices, payments } from './sales'
 export { saleReturns, claims, supplierClaims } from './returns-claims'
-export { sysConfig, ITEM_TRACKING_KEYS } from './sys-config'
+export { sysConfig, ITEM_TRACKING_KEYS, GRN_TAX_KEYS, grnTaxSettings, DEFAULT_GRN_TAX_SETTINGS } from './sys-config'
 export { getPaginatedItems } from './paginated'

 export type { PageParams } from './master'
@@ -77,6 +77,14 @@ export interface GrnItemBody {
  batches?: GrnBatchLineBody[]
  /** Only for items with TracksSerialNumbers — exactly acceptedQuantity entries. */
  serialNumbers?: string[]
+  /** Cost per base-UOM unit. Omitted on a PO line falls back to the PO line's cost. */
+  unitCost?: number
+  /** Omitted falls back to the GRN-wide percentage. */
+  discountPercent?: number
+  vatPercent?: number
+  nbtPercent?: number
+  /** Free-issue units: stocked but not costed. Serials/batches must cover accepted + free. */
+  freeQuantity?: number
 }

 export interface GrnBody {
@@ -84,6 +92,10 @@ export interface GrnBody {
  warehouseId: string
  receivedAt: string
  items: GrnItemBody[]
+  /** GRN-wide defaults for lines that don't set their own. */
+  discountPercent?: number
+  vatPercent?: number
+  nbtPercent?: number
  // TEMPORARY: required while auth doesn't resolve a logged-in user server-side — see testbug.md #28.
  receivedByUserId: string
 }
@@ -92,6 +104,9 @@ export interface DirectGrnBody {
  warehouseId: string
  supplierId?: string
  items: GrnItemBody[]
+  discountPercent?: number
+  vatPercent?: number
+  nbtPercent?: number
  // TEMPORARY: required while auth doesn't resolve a logged-in user server-side — see testbug.md #28.
  receivedByUserId: string
 }
@@ -47,6 +47,12 @@ export const stock = {
  adjust: (body: AdjustmentBody) =>
    api.post('/stock/adjustment', body).then(r => r.data),

+  /** Next free number for auto-generated serials: one past the highest `<prefix><digits>` already saved for the item. */
+  nextSerialSequence: (itemId: string, prefix: string) =>
+    api
+      .get<{ next: number }>('/stock/serials/next-sequence', { params: { itemId, prefix } })
+      .then(r => r.data.next),
+
  updateMovementReason: (id: string, reasonCode: string) =>
    api.patch(`/stock/movements/${id}/reason`, { reasonCode }).then(r => r.data),
 }
@@ -22,3 +22,53 @@ export const sysConfig = {
  set: (key: string, value: string, userId?: string | null) =>
    api.put<SysConfigResponse>(`/sys-config/${key}`, { value, userId }).then(r => r.data),
 }
+
+// ─── GRN tax settings (must match Distribution.Features.SysConfig.SysConfigService) ──────────
+
+export type TaxMode = 'Disabled' | 'Optional' | 'Mandatory'
+
+export const GRN_TAX_KEYS = {
+  vatMode: 'Grn.Tax.Vat.Mode',
+  vatRate: 'Grn.Tax.Vat.DefaultRate',
+  nbtMode: 'Grn.Tax.Nbt.Mode',
+  nbtRate: 'Grn.Tax.Nbt.DefaultRate',
+} as const
+
+export interface GrnTaxSettings {
+  vatMode: TaxMode
+  vatDefaultRate: number
+  nbtMode: TaxMode
+  nbtDefaultRate: number
+}
+
+const TAX_MODES: TaxMode[] = ['Disabled', 'Optional', 'Mandatory']
+
+/** Unconfigured, VAT is Optional (as GRNs behaved before the setting existed) and NBT is off. */
+export const DEFAULT_GRN_TAX_SETTINGS: GrnTaxSettings = {
+  vatMode: 'Optional',
+  vatDefaultRate: 0,
+  nbtMode: 'Disabled',
+  nbtDefaultRate: 0,
+}
+
+export function parseGrnTaxSettings(byKey: Record<string, string>): GrnTaxSettings {
+  const mode = (raw: string | undefined, fallback: TaxMode): TaxMode =>
+    TAX_MODES.includes(raw as TaxMode) ? (raw as TaxMode) : fallback
+  const rate = (raw: string | undefined) => {
+    const n = Number(raw)
+    return raw !== undefined && Number.isFinite(n) && n >= 0 && n <= 100 ? n : 0
+  }
+  return {
+    vatMode: mode(byKey[GRN_TAX_KEYS.vatMode], DEFAULT_GRN_TAX_SETTINGS.vatMode),
+    vatDefaultRate: rate(byKey[GRN_TAX_KEYS.vatRate]),
+    nbtMode: mode(byKey[GRN_TAX_KEYS.nbtMode], DEFAULT_GRN_TAX_SETTINGS.nbtMode),
+    nbtDefaultRate: rate(byKey[GRN_TAX_KEYS.nbtRate]),
+  }
+}
+
+export const grnTaxSettings = {
+  get: () =>
+    sysConfig
+      .getAll()
+      .then(all => parseGrnTaxSettings(Object.fromEntries(all.map(c => [c.key, c.value])))),
+}
@@ -418,6 +418,19 @@ export interface GrnItemResponse {
  rejectedQuantity: number
  batches: GrnBatchLineResponse[]
  serialNumbers: string[]
+  unitCost: number
+  discountPercent: number
+  vatPercent: number
+  /** Accepted qty x unit cost, before discount. */
+  grossAmount: number
+  discountAmount: number
+  vatAmount: number
+  /** Gross - discount + VAT. */
+  lineTotal: number
+  /** Free-issue units received at no charge (in stock, not costed). */
+  freeQuantity: number
+  nbtPercent: number
+  nbtAmount: number
 }

 export interface GrnResponse {
@@ -432,6 +445,16 @@ export interface GrnResponse {
  receivedAt: string
  createdAt: string
  items: GrnItemResponse[]
+  discountPercent: number
+  vatPercent: number
+  subTotal: number
+  discountAmount: number
+  /** Subtotal - discount; the base NBT is charged on (VAT is charged on this plus NBT). */
+  taxableAmount: number
+  vatAmount: number
+  totalAmount: number
+  nbtPercent: number
+  nbtAmount: number
 }

 export interface PurchaseReturnItemResponse {