MRP BADI MD_MODIFY_PRODVERS can't be called

Hi experts,

I know the BADI MD_MODIFY_PRODVERS is not valid in ecc6.0, but I still need to change the production version for subcontracting.

I need to change production version according to the quantity for subcontracting.

Does anyone know any BADI or enhancement that I can put my own logic to choice the production versio for subcontracting?

Thanks Lot.