diff --git a/erpnext/accounts/report/purchase_register/purchase_register.py b/erpnext/accounts/report/purchase_register/purchase_register.py
index 4bba066..47f79f1 100644
--- a/erpnext/accounts/report/purchase_register/purchase_register.py
+++ b/erpnext/accounts/report/purchase_register/purchase_register.py
@@ -185,7 +185,7 @@
 			pr_list = [d.purchase_receipt]
 		elif d.po_detail:
 			pr_list = frappe.db.sql_list("""select distinct parent from `tabPurchase Receipt Item`
-				where docstatus=1 and prevdoc_detail_docname=%s""", d.po_detail)
+				where docstatus=1 and purchase_order_item=%s""", d.po_detail)
 
 		if pr_list:
 			invoice_po_pr_map.setdefault(d.parent, frappe._dict()).setdefault("purchase_receipt", pr_list)
diff --git a/erpnext/patches/v6_16/update_billing_status_in_dn_and_pr.py b/erpnext/patches/v6_16/update_billing_status_in_dn_and_pr.py
index b660d39..481f130 100644
--- a/erpnext/patches/v6_16/update_billing_status_in_dn_and_pr.py
+++ b/erpnext/patches/v6_16/update_billing_status_in_dn_and_pr.py
@@ -22,7 +22,7 @@
 
 	# Update billed_amt in DN and PR which are not against any order
 	for d in frappe.db.sql("""select name from `tabPurchase Receipt Item` item
-		where (prevdoc_detail_docname is null or prevdoc_detail_docname = '') and docstatus=1""", as_dict=1):
+		where (purchase_order_item is null or purchase_order_item = '') and docstatus=1""", as_dict=1):
 
 		billed_amt = frappe.db.sql("""select sum(amount) from `tabPurchase Invoice Item`
 			where pr_detail=%s and docstatus=1""", d.name)