This field specifies the bank transaction code used to debit or credit the bank account of the customer, employee, supplier, etc. for a particular payment method.
Banks in Great Britain perform authorization checks on the bank transaction code field of the business partner: If an attempt to collect money fails because some transaction details are missing, a second collection attempt cannot be undertaken becuase the banks' authorization checks do not allow this (too many collections in a period). If a different payment method is set for the money to be collected, then a new bank transaction code can be selected.