CL_BUPA_IL_HEADER_SEARCH

How do I enhance this class?

What component is this class under?

I need to modify the method PREPARE_SEARCH in the class CL_BUPA_IL_HEADER_SEARCH.

I do not want to change the SAP standard, I just want to do a customer enhancement.

I can find the class in transaction SE24, but dont I need to redefine this in the component workbench?

Because in SE24 if I try to edit the class it is asking for access key to modify the SAP standard.

Please help and thanks!