How to peg receipts and requirements based of 300 class characeristics in PPDS?

Hi,

I need to peg orders (receipts & requirements) based of configurable characterists (300 class) in PPDS (CDP - Characteristics depending planning).

How can I say, which characteristics are relevant for pegging?

Any badi, exit, code for internal table modification while pegging?

Thanks in advance.

Regards,

Surajit Das