In SAP Pricing procedure is used to define condition supplement for the material price. The condition supplement specifies the discount, surcharge, freight etc that we want a system every time to access material price condition records.
Pricing procedure is picked up based on schema group Vendor & schema group Purchase Org. In this document author put an analysis of access sequence in pricing procedure with step by step screenshots in detail.
Download – Analysis of Access Sequence in Pricing Procedure in SAP
very nice presentation on pricing procedure,
Thanks