diff --git a/erpnext/manufacturing/doctype/work_order/test_work_order.py b/erpnext/manufacturing/doctype/work_order/test_work_order.py
index 534701faf33..c5aba40439b 100644
--- a/erpnext/manufacturing/doctype/work_order/test_work_order.py
+++ b/erpnext/manufacturing/doctype/work_order/test_work_order.py
@@ -3492,6 +3492,42 @@ class TestWorkOrder(ERPNextTestSuite):
 
 		frappe.db.set_single_value("Manufacturing Settings", "validate_components_quantities_per_bom", 0)
 
+	def test_transferred_qty_sums_item_and_its_alternate(self):
+		# Base item + its alternate transfers must sum onto the required row, not overwrite.
+		fg_item = "Test FG Item For Alternate Transferred Qty"
+		source_warehouse = "Stores - _TC"
+		raw_material = "Test RM For Alternate Transferred Qty"
+		alternate_item = "Alternate Test RM For Alternate Transferred Qty"
+
+		make_item(fg_item, {"is_stock_item": 1})
+		for item in [raw_material, alternate_item]:
+			make_item(item, {"is_stock_item": 1, "allow_alternative_item": 1})
+			test_stock_entry.make_stock_entry(item_code=item, target=source_warehouse, qty=10, basic_rate=100)
+
+		frappe.get_doc(
+			{
+				"doctype": "Item Alternative",
+				"item_code": raw_material,
+				"alternative_item_code": alternate_item,
+				"two_way": 1,
+			}
+		).insert()
+
+		make_bom(item=fg_item, source_warehouse=source_warehouse, raw_materials=[raw_material])
+		wo = make_wo_order_test_record(item=fg_item, qty=10, source_warehouse=source_warehouse)
+
+		# 6 as the base item
+		frappe.get_doc(make_stock_entry(wo.name, "Material Transfer for Manufacture", 6)).submit()
+		# 4 as the alternate item, linked back to the base
+		alt_transfer = frappe.get_doc(make_stock_entry(wo.name, "Material Transfer for Manufacture", 4))
+		alt_transfer.items[0].item_code = alternate_item
+		alt_transfer.items[0].original_item = raw_material
+		alt_transfer.submit()
+
+		wo.reload()
+		self.assertEqual(wo.required_items[0].transferred_qty, 10)
+		self.assertEqual(wo.material_transferred_for_manufacturing, 10)
+
 	def test_components_qty_for_bom_based_manufacture_entry(self):
 		frappe.db.set_single_value("Manufacturing Settings", "backflush_raw_materials_based_on", "BOM")
 		frappe.db.set_single_value("Manufacturing Settings", "validate_components_quantities_per_bom", 1)