When exploding the quantity structure during the product costing, the System considers the special procurement keys of the involved materials/components. For this you can enter one special procurement key in the costing view of the material master (there is also a special procurement key in the MRP view, but in product costing the special procurement key of the costing view has the highest priority).

In the AFS System you can also define special procurement classes for the product costing (compare AFS Implementation Guide: Product Cost Controlling). So you can simulate alternative procurement options during the product costing (e.g. production in plant India or Portugal).

According to the special procurement class you define the special procurement key, the System should use when costing a certain costing version. In the AFS valuation view you assign a material to a special procurement class.

You can only release one costing version (procurement alternative) per material, thus the costing version becomes relevant for valuation. You can save the results of further costing versions and write them in further price fields of the material master (e.g. planned price 1, 2, 3) for information.