Message SAP /BON/AG_MNT008 - Payment method &2 does not exist for country &1

Procedure
Check whether you have entered the correct payment method for countryV1.
If you have entered the correct payment method, check the viewV_CRMC_BUAG_PAYM in transaction SM30 to see if the payment method existswith data origin ERP. If not, maintain the missing payment methodin SAP ERP and transport the entry into SAP CRM.