Selection of Prod. Ver.during MFBF

Dear Gurus,

I am in REM and i have a scenario where i have one material with multiple versions and during MRP run system is selecting version first maintained in material master and creating plan order with that version.This is std system behaviour as lot size,validity is same for all the versions.My requirement is i need to change the version at the time of MFBF.

Kindly guide me how to achieve the same.

With Regards.