Special price list for Business partner validation in Purchase Order

Hi SBO Expert,

We need two validation for Purchase order

1. We have special price for business partner, we need to put validation if a particular supplier, item code and price are not matching

with special price list then system block the PO

Example – Supplier-ABCD item P00121-MS Angle 10MM Price-48/- we put in special price list (Table name-OSPP). In PO required same validation,

if item code, supplier and price are not matching with special price then system block the entry.

2. If any item already exist in special price list then and not matching with a particular supplier then goes for approval.

Your reply is highly appreciated.

Thanks in advance

Regards

Mukesh Singh