Instead of applying/changing code of ‘user-exit’ ABAPs ZXRSAUnn or ZXRSRUnn, you can also use BADI RSU5_SAPI_BADI
Tcode SE18:



Implementation –> Overview or Implementation –> Create
Double click on METHOD: DATA_TRANSFORM


Within METHOD IF_EX_RSU5_SAPI_BADI~DATA_TRANSFORM the required user exit code can be entered/altered.