In addition to the separate application of the two enhancement types described above, you can also add customer fields and include existing fields in the BAPI for a single SAP table.
The same components described above are involved, and the same rules and guidelines apply. In addition, make sure to observe the following in the structure of the BAPI table extensions:
The following diagram illustrates how the BAPI table extension has to be defined both to use the existing fields URL and LANGU in the BAPI and to extend the table with the three customer fields PLANETYPE, COMPANY, and SEATSMAX.