fix: not able to submit subcontracting receipt (#41041)

diff --git a/erpnext/subcontracting/doctype/subcontracting_receipt/subcontracting_receipt.py b/erpnext/subcontracting/doctype/subcontracting_receipt/subcontracting_receipt.py
index e20eb27..52193c5 100644
--- a/erpnext/subcontracting/doctype/subcontracting_receipt/subcontracting_receipt.py
+++ b/erpnext/subcontracting/doctype/subcontracting_receipt/subcontracting_receipt.py
@@ -722,6 +722,7 @@
 						"purchase_order": item.purchase_order,
 						"purchase_order_item": item.purchase_order_item,
 						"subcontracting_receipt_item": item.name,
+						"project": po_item.project,
 					}
 					target_doc.append("items", item_row)