SAP SD CIN !!

Dear friends plz sent this for me !!

1) how to reverse excise invoice when there is returns/partial returns/cancellation etc? EI returns doc is required or not?

2)Internal Excise Invoice means??

3)If there are more than one series group how the system understand the no.ranges for generating EI?

4)where will we configure C forms for concession and where will we assign in Sales order?

5)where will we configure price escalations A certificate and where we assign it?

6)In value contract general WK1 contract item category WKN details we have to assign material number. but we have assortment of materials like more than one then how it is possible to assign one material.

Plz forward the solutions to sreedhar_kodali@yahoo.com

Thanks & Regards,

Sreedhar.