Configuring Supplier with multiple sites to handing incoming invoices

Summary:

Incoming supplier invoices fail to route when a supplier has multiple sites.

Content (please ensure you mask any confidential information):

My company (buyer side) is testing using OBN to process incoming invoices. We have no issue when we define a supplier to have only one B2B site. However, when we have multiple B2B sites we receive the following error: “Multiple Application Partner Documents found”

Configuration based on OBN Payables Invoices Failing with "Application Partner Document Records Setup for the Message" (Doc ID 2643448.1) was not successful.

A second solution (Solution to Multiple Supplier Accounts on Oracle Business Network (OBN) (Doc ID 1133984.1)