The following presumes that the bank has rejected the file for some reason which needs amending in FMS, in this example it is an incorrect bank account for a supplier.
Firstly make the changes to the bank account details in FMS via Focus>Accounts Payable>Suppliers
Then go to Focus>Accounts Payable>BACS Processing
Highlight the required file
Go to dropdown menu BACS Processing>Recreate BACS Run File (or use the icon in the top right hand corner)
This will then give you a warning – read this carefully to check
The original file will show in the list together with the new recreated one both with the same run reference
This may then be uploaded to the bank