Payment Details 
Use
Payment details are identified through the
· Business partner
· Company code
· Currency in which payment is made
You can see how the bank details are assigned by choosing Partner Bank Details where the bank details that are valid for a business partner are defined.
The partner bank details control which of the business partner’s banks is used. You can enter several sets of bank details for one business partner.
When you define payment details you can enter the payment type (customer accounts and/or G/L account posting) and the payment method.
You can also define the payment method supplement, which is a characteristic for grouping payments.
In addition, you can enter the house bank ID and bank account ID for the account at the relevant house bank. With the house bank ID you define your own bank details, which are generally to be used for payments to and from your business partner. The system checks the currency of the house bank account against the currency entered for the payment details.
See also:
Creating Standing Instructions for Payment Details