How can I define purchase order partners in contract?

Hi to all.

When I am creating a purchase order by ME21N t-code, I can define partners, such as forwarding agent, etc., I would like to know if I can define these partners directly in contract creation, by ME31K, aiming when I will create a PO from a contract, the SAP fill the PO partners with the partners defined in contract. Can I do that?

Thanks regards.