Scale Pricing and many items on a PO due to different WBS

Hello,

We want to use scale pricing in contracts. The problem is that our purchase orders have many order lines as we buy the goods to many WBS elements.

So If we buy 9 items and put them on 3 different lines with 3 items on each, we do not get the price we should have when we buy 9, but 3 times the price for 3.

Is there a way to solve this?

rgds

GAR