Field help (FRMBAN) 

Enter the bank associated with the remittance. The payments included in the remittance must be assigned to this same bank.
When a payment not assigned to a bank is selected, a warning message is used to force the bank of the payment on the bank of the remittance.
The bank related to the remittance must also be specified. As a consequence, only the payments assigned to this bank or not assigned payments are suggested in the selection panel.