Ability to Cancel Supplier Return Without Receipt

Summary:

How can a Supplier Return Without Receipt transaction be cancelled after it has already been submitted?

Content (please ensure you mask any confidential information):

Use Case: Supplier Return Without Receipt transaction is entered for multiple lines/quantities. When physically shipping to the Supplier, an item or quantity cannot be found. The Supplier Return Without Receipt transaction has already been Submitted, so can be seen in the Manage Shipment Lines screen. Backorder does not seem to work - it throws the message "This action cannot be performed on the selected records." Creating a shipment and updating the Backordered quantity to 0 throws this error: "Error: You cannot update the backorder quantity for a line of order type: Unreferenced supplier return. (WSH-2460853)". Edit/Delete on the Supplier Return