PO Approval based on Vendor Category.

Hi

There is a typical scenario in my client's system. Now we need to implement SAP

PO approval process is there.

There are two major characteristics

1. PO value

2. Vendor's present category.

Vendor's present grade :

During vendor evaluation, vendor are scored and classified into A,B,C, D categoires.

At the time of creation of PO, it should check for Vendor's category and PO value for triggering Release strategy.

Can any help me on this... how to assign vendor categories to a communication structure CEKKO.

Thanks in advance.

Atchyuth