IDR selecting an incorrect site.

Summary: When a Supplier is set up with separate purchase and pay sites is it possible to apply the paysite on IDR invoice creation?

Content: When IDR creates a PO matched invoice the procuring supplier site automatically populates at header level. Because our paysite is different, to adjust this each line needs deleting which is counterproductive. Is there a way of populating with the BUs chosen pay site automatically or, as others have suggested, a way of allowing changes to the site without deletion of the line level detail. Alternatively, could it be that our supplier setup process needs attention to link and use addresses and sites in a different way?