custom fields

Hi all,

We have a generic extractor that has been enhanced to accomdate some custom fields. And the userexit is populating those fields. Now in the custom fields i have a few fields that i dont see referenced in the userexit. for instance fields like BWSTSYS1,BWSTSYS2,ZBWSTSYS3, ZBWSTSYS4 ... etc. Now how can i know how the values of these fields are being captured in the extractor. i dont see any code in the userexit referencing to these fields.

Any insight or help is appreciated and fully rewarded.

Thanks,

Mav.