Adding Z field in the BP Search Result field

Hi All,

I have ZCL_BUPA_IL_HEADER_SEARCH and its working fine. Now I want to add a custom field in the result which should be populated when all other BP related information is selected (i.e. last name and first name). I need to know the BADI or any other way to access the place where i can write my custom logic to populate this z field.

Thanks in Advance.