Hi,
In info records and contracts (always time dependent), supplementary pricing is pulled. Here, the pricing procedure assigned to the condition type PB00 (in M/06) will be applicable. Even if you maintain a different schema group in vendor master, its not applicable in case of time dependent documents.
When you create release order against the contract, the pricing procedure will be pulled based on the schema group assigned. You may test the scenario and check whether the correct schema is determined in the release order.
Regards,
AKPT