fix: typo

Author: mihir-kandoi

erpnext/controllers/accounts_controller.py

@@ -4122,7 +4122,7 @@ def validate_fg_item_for_subcontracting(new_data, is_new):
 			child_item.idx = len(parent.items) + 1
 			child_item.insert()
 		else:
-			child.save(ignore_permissions=True)
+			child_item.save(ignore_permissions=True)
 
 	parent.reload()
 	parent.flags.ignore_validate_update_after_submit = True