Issue with Returns PO process

Using GR-Bsd IV flag so for returning goods to a vendor we are

Creating a Returns PO - Checking the "Returns Item" check box for the materials to be returned to vendor

Approve the the Returns PO

Then we go in to MIGO to do a Goods Receipt>>>>>Purchase Order>>>>>>Movement Type 161.

When we execute, get a message

Document 4500011158   does not contain any selectable items

Message no. M7064

What step(s) are we missing in this process?