diff --git a/erpnext/manufacturing/doctype/work_order/work_order.py b/erpnext/manufacturing/doctype/work_order/work_order.py
index 6bb03310389..5971587da56 100644
--- a/erpnext/manufacturing/doctype/work_order/work_order.py
+++ b/erpnext/manufacturing/doctype/work_order/work_order.py
@@ -89,10 +89,18 @@ class WorkOrder(Document):
 		self.status = self.get_status()
 		self.validate_workstation_type()
 
+		if self.source_warehouse:
+			self.set_warehouses()
+
 		validate_uom_is_integer(self, "stock_uom", ["qty", "produced_qty"])
 
 		self.set_required_items(reset_only_qty=len(self.get("required_items")))
 
+	def set_warehouses(self):
+		for row in self.required_items:
+			if not row.source_warehouse:
+				row.source_warehouse = self.source_warehouse
+
 	def validate_workstation_type(self):
 		for row in self.operations:
 			if not row.workstation and not row.workstation_type: