VOFM Routines

Hi Gurus,

In VOFM routines ( Copy Requirements, Data Transfer, requirements, Formulae), how to find what data/tables available in a particular routine.

In the other words, if we want to modify these routines or when we add new routines, how to know what data/structure available in a particular routine,to implemet the changes.

Please reply as early as possible......

Regards,

Murali