I keep on getting this error below and cannot release a PO receipt for a non-stock item. Both line items are already linked to the PO and Sales Order. Refer to screenshots below. Does anyone know how to resolve this error?
Error Message:
There are one or multiple lines in the 002436 drop-ship purchase order that are not linked to a sales order. Link all lines in the 002436 drop-ship purchase order first.
Screenshot of SO:

Screenshot of PO:

Screenshot of PO Receipt Error Message

Thanks,
Frances