From ec392a7bcf4eb46d2bbdbca2649366e26f5c558b Mon Sep 17 00:00:00 2001
From: pandiyan <pandiyanpalani37@gmail.com>
Date: Wed, 2 Sep 2026 10:04:05 +0530
Subject: [PATCH] fix(manufacturing): use item warehouses in production plan
 work orders (#58663)

(cherry picked from commit e74ab38eeb19fd2849caac13bcbb987909ba56c7)

# Conflicts:
#	erpnext/manufacturing/doctype/production_plan/services/work_order_planning.py
---
 .../production_plan/production_plan.py        |  4 +-
 .../production_plan/test_production_plan.py   | 51 +++++++++++++++++++
 2 files changed, 52 insertions(+), 3 deletions(-)

diff --git a/erpnext/manufacturing/doctype/production_plan/production_plan.py b/erpnext/manufacturing/doctype/production_plan/production_plan.py
index a9aaedc8894..9b992722fc7 100644
--- a/erpnext/manufacturing/doctype/production_plan/production_plan.py
+++ b/erpnext/manufacturing/doctype/production_plan/production_plan.py
@@ -929,8 +929,6 @@ class ProductionPlan(Document):
 
 		wo = frappe.new_doc("Work Order")
 		wo.update(item)
-		if not wo.source_warehouse:
-			wo.source_warehouse = item.get("fg_warehouse")
 
 		wo.reserve_stock = self.reserve_stock
 		wo.planned_start_date = item.get("planned_start_date") or item.get("schedule_date")
@@ -939,7 +937,7 @@ class ProductionPlan(Document):
 			wo.fg_warehouse = item.get("warehouse")
 
 		wo.set_work_order_operations()
-		wo.set_required_items(reset_source_warehouse=True)
+		wo.set_required_items()
 
 		try:
 			wo.flags.ignore_mandatory = True
diff --git a/erpnext/manufacturing/doctype/production_plan/test_production_plan.py b/erpnext/manufacturing/doctype/production_plan/test_production_plan.py
index 34467a516a6..7ba22675724 100644
--- a/erpnext/manufacturing/doctype/production_plan/test_production_plan.py
+++ b/erpnext/manufacturing/doctype/production_plan/test_production_plan.py
@@ -128,6 +128,57 @@ class TestProductionPlan(ERPNextTestSuite):
 		plan.reload()
 		plan.cancel()
 
+	def test_subassembly_work_order_uses_raw_material_default_warehouses(self):
+		raw_material_warehouses = {
+			make_item(
+				properties={
+					"is_stock_item": 1,
+					"item_defaults": [
+						{"company": "_Test Company", "default_warehouse": "_Test Warehouse - _TC"}
+					],
+				}
+			).name: "_Test Warehouse - _TC",
+			make_item(
+				properties={
+					"is_stock_item": 1,
+					"item_defaults": [
+						{"company": "_Test Company", "default_warehouse": "_Test Warehouse 1 - _TC"}
+					],
+				}
+			).name: "_Test Warehouse 1 - _TC",
+		}
+		subassembly_item = make_item(properties={"is_stock_item": 1}).name
+		finished_item = make_item(properties={"is_stock_item": 1}).name
+
+		make_bom(item=subassembly_item, raw_materials=raw_material_warehouses)
+		make_bom(item=finished_item, raw_materials=[subassembly_item])
+
+		plan = create_production_plan(
+			item_code=finished_item,
+			warehouse="Finished Goods - _TC",
+			sub_assembly_warehouse="Finished Goods - _TC",
+			skip_available_sub_assembly_item=1,
+			skip_getting_mr_items=1,
+			do_not_submit=1,
+		)
+		plan.get_sub_assembly_items()
+		plan.save()
+		plan.submit()
+		plan.make_work_order()
+
+		work_order_name = frappe.db.get_value(
+			"Work Order",
+			{"production_plan": plan.name, "production_item": subassembly_item},
+		)
+		work_order = frappe.get_doc("Work Order", work_order_name)
+
+		self.assertFalse(work_order.source_warehouse)
+		self.assertEqual(work_order.fg_warehouse, plan.sub_assembly_warehouse)
+		self.assertEqual(
+			{row.item_code: row.source_warehouse for row in work_order.required_items},
+			raw_material_warehouses,
+		)
+
 	def test_production_plan_for_existing_ordered_qty(self):
 		"""
 		- Enable 'ignore_existing_ordered_qty'.