Subcontracting Worksheet - Why only for Released prod. orders?!

Hello all,

I dont understand why the Subcontracting Worksheet only gets the the requirement if prod. order is released. Why not also the firm planned ones? For me, it is already too late to subcontract someoperation for some semi-finished goods in the released stage of the prod. order. I need to dispatch purchase orders for my subcontractors weeks ahead.

My question is: can the core engine of the subcontracting worksheet be modified to take into consideration the firm planned prod orders without disrupting any of its logic?

Thanks alot!