diff --git a/erpnext/patches/v10_0/fix_reserved_qty_for_sub_contract.py b/erpnext/patches/v10_0/fix_reserved_qty_for_sub_contract.py
index 8a456382ab7..5d025374eda 100644
--- a/erpnext/patches/v10_0/fix_reserved_qty_for_sub_contract.py
+++ b/erpnext/patches/v10_0/fix_reserved_qty_for_sub_contract.py
@@ -6,6 +6,7 @@ import frappe
 from erpnext.stock.utils import get_bin
 
 def execute():
+	frappe.reload_doc("buying", "doctype", "purchase_order_item_supplied")
 	for d in frappe.db.sql("""
 		select distinct rm_item_code, reserve_warehouse
 		from `tabPurchase Order Item Supplied`
@@ -26,4 +27,4 @@ def execute():
 			bin_doc = get_bin(d[0], d[1])
 			bin_doc.update_reserved_qty_for_production()
 		except:
-			pass
\ No newline at end of file
+			pass