Derive Receivables Account from Standard Memo Line Revenue using Mapping Set

Summary

Goal – I need to override the Default Receivable Account Code Combination, setup in Auto Accounting. I want to use the Standard Memo Lines Revenue Natural Account to derive the entire Receivables Acc

Content

Reason - We cannot use Transaction Type to determine the Receivables Account because each Invoice will have more than one Receivables Account depending on the Standard Memo Line Revenue.  The transactions are coming in from APEX via SOAP, not using AutoInvoice and not creating directly in Fusion.

Screen shots of all of my setups are in the attached document.

I am stumped.  Any leads would be greatly appreciated.