For BOM in Order

Hi

We are maintaining the different item categories (LUMF, ERLA) in Material Master for the BOM.

All the material codes are extended to all the plants (Header and Child)

We want to ensure in order the BOM should explode, because we have maintained the price at child level and because Header material is extended the order also gets saved. Irrespective of the fact that BOM is extended or not.

Please provide the some solution other then USER EXIT.