BAPI enhancement with append

Dear SAP experts,

in our CRM system we have a custom append strcture in the standard structure of the BAPI FRG0010.

We can't find any transport request in the system which contains this custom append structure and the enhancements of the standard one and of the standard programs. How is it possible?

This custom logic was implemented about 10 years ago....we have searched in the AET and in the EEWB but no enhancements are defined for this structure.

Is there a way to delete automatically the append and all the dependent enhancements in the standard programs?

Thank you for your help.

Regards.

Andrea