How can you make the ship to location on the PO be another suppliers location(address) for OSP?

We have an scenario where we buy an item from one supplier and that creates an OSP po to another supplier. We want the address(location) on the first suppliers po to be the ship to location for the second supplier, not our ship to location. Can this be done? It would appear with our setups that it puts our default location on the PO.