MTO VPRS

Dear all,

I met a problem when I tried to figure the  vprs condition type.
I was in a MTO senario, and the SD line item was assign to a wbs。 the vprs picked the stand price of the material, but when deliverying, it picked the plan value of the wbs. (The plan value came from the product order of the material, which is relatted to the wbs).

How could i make the vprs picking the plan value of the wbs.

Thanks a lot!