diff --git a/erpnext/buying/doctype/purchase_order/purchase_order.py b/erpnext/buying/doctype/purchase_order/purchase_order.py
index 90d0646..ef9372e 100644
--- a/erpnext/buying/doctype/purchase_order/purchase_order.py
+++ b/erpnext/buying/doctype/purchase_order/purchase_order.py
@@ -368,7 +368,6 @@
 		"Purchase Order": {
 			"doctype": "Purchase Receipt",
 			"field_map": {
-				"per_billed": "per_billed",
 				"supplier_warehouse":"supplier_warehouse"
 			},
 			"validation": {