Field help (CDACPT) 

The accounts in use can be fixed here by payment attribute or indicated during the payment entry.

For the Bank<=> BP, a control account or general account pre-payment code can be entered. In this case, the payment lines will be posted to the pre-payment account specified instead of the BP account in the payment header.

For the other payment attribute types, the account can be specified by the "Account" field or via the Payment type accounting code, which is used to have 2 different accounts according to the payment line representing a gain or loss.