Exclude cancelled transaction

wizard/pos_export_bc_wizard.py

@@ -102,6 +102,8 @@ class PosExportBcWizard(models.TransientModel):
                 # To get the total amount tendered before change, we sum only the positive payments.
                 # The change/return is typically stored in order.amount_return
                 paid = sum(p.amount for p in order.payment_ids if p.amount > 0)
+                if paid == 0:
+                    continue
                 pax = order.customer_count if 'customer_count' in order._fields else 1
                 return_amt = order.amount_return if 'amount_return' in order._fields else (paid - charge if paid > charge else 0)