diff --git a/erpnext/accounts/doctype/payment_entry/payment_entry.py b/erpnext/accounts/doctype/payment_entry/payment_entry.py
index 6cec259d0b8..8a17c075b48 100644
--- a/erpnext/accounts/doctype/payment_entry/payment_entry.py
+++ b/erpnext/accounts/doctype/payment_entry/payment_entry.py
@@ -558,7 +558,7 @@ def get_outstanding_reference_documents(args):
 
 	# Get negative outstanding sales /purchase invoices
 	negative_outstanding_invoices = []
-	if args.get("party_type") not in ["Student", "Employee"] and not args.get("voucher_no"):
+	if args.get("party_type") in ("Supplier", "Customer") and not args.get("voucher_no"):
 		negative_outstanding_invoices = get_negative_outstanding_invoices(args.get("party_type"),
 			args.get("party"), args.get("party_account"), party_account_currency, company_currency)
 
@@ -589,7 +589,7 @@ def get_outstanding_reference_documents(args):
 
 	# Get all SO / PO which are not fully billed or aginst which full advance not paid
 	orders_to_be_billed = []
-	if (args.get("party_type") != "Student"):
+	if (args.get("party_type") in ("Supplier", "Customer")):
 		orders_to_be_billed =  get_orders_to_be_billed(args.get("posting_date"),args.get("party_type"),
 			args.get("party"), party_account_currency, company_currency)
 
@@ -601,7 +601,7 @@ def get_orders_to_be_billed(posting_date, party_type, party, party_account_curre
 		voucher_type = 'Sales Order'
 	elif party_type == "Supplier":
 		voucher_type = 'Purchase Order'
-	elif party_type == "Employee":
+	else:
 		voucher_type = None
 
 	# Add cost center condition