P41061 Supplier Prices

Hello,

In regard to supplier prices, if I am creating purchase orders for future deliveries, the deliveries will happen 3 months after the purchase order is created, how do I get the P4310 to find the future prices in P41061? The only way I have found to make this happen is to change the order date in the order header while creating the purchase order. Is this the way the system is designed to work or is there another method of doing this?

Thank you.