Validation of PO outbound via OBN is unsuccessful

Summary:

When we initially setup OBN freshly for a fusion POD, we need to provide a Oracle user details that Oracle uses for reading data from Oracle Fusion.

However, we need to change the user details, but this screen is not allowing to change the Oracle user details. It has option to change only the network user details

We are unable to send PO XML via OBN in one of our test pods (OBN PO transmission is working in a old dev pod, but not in a new one). We are testing with the standard OBN-cXML format without any customisation of the data model or XSL.