Look for program names defined as constants in RFITEMAR (there are some including 'RFITEMAR' itself) and replace the standard names with your copy names. Also perform some where-used search on those constants to identify some form like fill_kdf_callback which use those constants)
For information which requrement causes the copy of this report, as SAP provided some BTE/BAdI to adapt those FI item reports ?
Regards,
Raymond