How to Configure Auto Approve approval rules for Invoices with PO Matched lines

Summary: How to Configure Invoice Approval Rules in BPM so that PO Matched Invoice lines get Auto Approved without adding extra conditions to our current approval rules.

Content (required): We have already over 100 invoice approval rules for Payables and now we are implementing Procurement.

We need all invoices that have PO matched lines to be auto approve. We did create an invoice approval rule according to this note:

"How to Configure Invoice Approval Rules for Different Purchase Order PO Matched Scenarios (Doc ID 2139169.1)". 

The invoices are auto approved but then they are assigned to other invoice approval rules. 

Our need is to only auto approve the invoices.