Collaboration Messaging Enabled for Purchase Order Outbound , But the requisition and PO not linked

Summary:

Hello All,

We have punchout requisition process, requisition converted to Purchase order, purchase order details communicated back to supplier as PO outbound through collaboration messaging framework , CMK enabled through Oracle business network(OBN) we have registered trading partners under OBN, we are getting the feedback from vendor that, requisition and PO is not linked and users not able to see Order history.

It seems requisition created in one profile and the Purchase order created in another profile

In punchout catalog, we have enabled the source as Direct cXML Supplier Punchout, do we need to select OBN in that case, please suggest