diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
index fd77d4b..d741215 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
@@ -112,6 +112,11 @@
 		self.set_status()
 		if self.is_pos and not self.is_return:
 			self.verify_payment_amount_is_positive()
+
+		#validate amount in mode of payments for returned invoices for pos must be negative
+		if self.is_pos and self.is_return:
+			self.verify_payment_amount_is_negative()
+			
 		if self.redeem_loyalty_points and self.loyalty_program and self.loyalty_points:
 			validate_loyalty_points(self, self.loyalty_points)
 
@@ -971,6 +976,11 @@
 			if entry.amount < 0:
 				frappe.throw(_("Row #{0} (Payment Table): Amount must be positive").format(entry.idx))
 
+	def verify_payment_amount_is_negative(self):			
+		for entry in self.payments:
+    			if entry.amount > 0:
+				frappe.throw(_("Row #{0} (Payment Table): Amount must be negative").format(entry.idx))				
+
 	# collection of the loyalty points, create the ledger entry for that.
 	def make_loyalty_point_entry(self):
 		returned_amount = self.get_returned_amount()
diff --git a/erpnext/controllers/sales_and_purchase_return.py b/erpnext/controllers/sales_and_purchase_return.py
index 43d820f..d0f3ccd 100644
--- a/erpnext/controllers/sales_and_purchase_return.py
+++ b/erpnext/controllers/sales_and_purchase_return.py
@@ -232,8 +232,8 @@
 					doc.append('payments', {
 						'mode_of_payment': data.mode_of_payment,
 						'type': data.type,
-						'paid_amount': -1 * paid_amount,
-						'base_paid_amount': -1 * base_paid_amount
+						'amount': -1 * paid_amount,
+						'base_amount': -1 * base_paid_amount
 					})
 			elif doc.doctype == 'Purchase Invoice':
 				doc.paid_amount = -1 * source.paid_amount