Changing or Supplementing Working Time Data During Transfer to SAP R/3 

Use

Working time data that is transferred from CATS notebook to SAP R/3 during synchronization first runs through the MYCATS03 SAP enhancement before it is stored in the database table of the Time Sheet. You can change or supplement data in this SAP enhancement. The next time data is synchronized, CATS notebook transfers to SAP R/3 the data that has been changed.

You should only use this SAP enhancement if the SAP enhancement CATS0002 (Supplement Recorded Data) does not allow you to fulfill your requirements.