Creating cXML Process PO Messaging WITHOUT OSN

Summary

Having an issue creating a PO through cXML messaging without OSN

Content

Hello, hoping someone may be able to provide some clarity.  There is almost no documentation that I can find regarding setting up a punchout supplier WITHOUT OSN through a direct cXML punchout.  The catalog is no problem to set up.  However, the issue comes when attempting to create the PO.  

1. My understanding from what documentation that I could find, is that you need to set it up as a B2B adapter.  Is that correct?

2. Anytime I do that, subsequently setting up the Supplier Site using Collaboration Messaging Framework, I get the following error: