Revert purchase order

internal/validator/purchase_order_validator_test.go

@@ -11,26 +11,34 @@ import (
 )
 
 func validCreatePurchaseOrderRequest() *contract.CreatePurchaseOrderRequest {
-	ingredientID := uuid.New()
-	quantity := 1.0
-	unitID := uuid.New()
-
 	return &contract.CreatePurchaseOrderRequest{
 		VendorID:        uuid.New(),
 		PONumber:        "PO-001",
 		TransactionDate: "2026-05-29",
 		Items: []contract.CreatePurchaseOrderItemRequest{
 			{
-				IngredientID:       &ingredientID,
+				IngredientID:       uuid.New(),
 				PurchaseCategoryID: uuid.New(),
-				Quantity:           &quantity,
-				UnitID:             &unitID,
+				Quantity:           1,
+				UnitID:             uuid.New(),
 				Amount:             1000,
 			},
 		},
 	}
 }
 
+func TestPurchaseOrderValidatorCreateRejectsMissingRawMaterialFields(t *testing.T) {
+	validator := NewPurchaseOrderValidator()
+	req := validCreatePurchaseOrderRequest()
+	req.Items[0].IngredientID = uuid.Nil
+
+	err, code := validator.ValidateCreatePurchaseOrderRequest(req)
+
+	require.Error(t, err)
+	require.Equal(t, constants.MissingFieldErrorCode, code)
+	require.Contains(t, err.Error(), "ingredient_id is required")
+}
+
 func TestPurchaseOrderValidatorCreateAllowsMissingDueDate(t *testing.T) {
 	validator := NewPurchaseOrderValidator()