diff --git a/erpnext/accounts/doctype/payment_entry/payment_entry.py b/erpnext/accounts/doctype/payment_entry/payment_entry.py
index 8b7c096..bcb22f0 100644
--- a/erpnext/accounts/doctype/payment_entry/payment_entry.py
+++ b/erpnext/accounts/doctype/payment_entry/payment_entry.py
@@ -60,6 +60,7 @@
 		self.set_remarks()
 		self.validate_duplicate_entry()
 		self.validate_allocated_amount()
+		self.validate_paid_invoices()
 		self.ensure_supplier_is_not_blocked()
 		self.set_status()
 
@@ -266,6 +267,25 @@
 						frappe.throw(_("{0} {1} must be submitted")
 							.format(d.reference_doctype, d.reference_name))
 
+	def validate_paid_invoices(self):
+		no_oustanding_refs = {}
+
+		for d in self.get("references"):
+			if not d.allocated_amount:
+				continue
+
+			if d.reference_doctype in ("Sales Invoice", "Purchase Invoice", "Fees"):
+				outstanding_amount, is_return = frappe.get_cached_value(d.reference_doctype, d.reference_name, ["outstanding_amount", "is_return"])
+				if outstanding_amount <= 0 and not is_return:
+					no_oustanding_refs.setdefault(d.reference_doctype, []).append(d)
+		
+		for k, v in no_oustanding_refs.items():
+			frappe.msgprint(_("{} - {} now have {} as they had no outstanding amount left before submitting the Payment Entry.<br><br>\
+					If this is undesirable please cancel the corresponding Payment Entry.")
+				.format(k, frappe.bold(", ".join([d.reference_name for d in v])), frappe.bold("negative outstanding amount")),
+				title=_("Warning"), indicator="orange")
+
+
 	def validate_journal_entry(self):
 		for d in self.get("references"):
 			if d.allocated_amount and d.reference_doctype == "Journal Entry":