How to handle BAI file with standard EBS program when the Bank code is too generic?

Dear Experts. We are just trying to implement the BAI file for posting some of our cash postings through the standard configuration and program but I only see in configuration that you map the GL based on the BANK BAI code such as 165 for pre authorized ACH Credits. But we need information from the line 88 to know who the ACH was from to post to different accounts. Is there anything in standard SAP for this or do we have to create our own custom program? Any help or advise you can give us would be appreciated!