Bug encountered when emailing a PO return order from vendor viewer

In Paperless Office, open the Vendor Viewer.

Change the Form Type to Return Order.

Select an item in the display and click the Electronic Delivery icon.

The following error is displayed: File "PO_ReturnOrderHeader" not found.

There is no such file in the company directory.

The file should be PO_ReturnHeader according to the file listing: