To see which Bank Rec codes create GL transactions, go to AP Manager and choose TOOLS, Transaction Codes. When you view the codes, look at the Offset Account field. If the field is blank, NO GL transactions are created when using that code. If an account number is in the field, GL transactions will be created.
Another way to tell is in Bank Reconciliation. If you choose a code that creates GL transactions, the period field will be accessible. The period field is grayed out if no GL transactions are created.