The customer exit can be used to make changes in SWIFT format MT300.
Header and Trailer:
The customer exits are firstly called up for the file header and then per transaction for the transaction header. The customer exits for the
trailer are called up per transaction for the transaction trailer and then for the file trailer.
Within customer exits, you can dfferentiate between calling up for the file and for the transaction by using the flags entitled file_header_flag and ta_header_flag.
- EXIT_RFTXEXIT_301: Customer Exit SWIFT MT300 - Header