Is there a document explaining how IDR recognizes invoice lines?

Summary:

Is there a document explaining how IDR recognizes invoice lines?

Content (required):

We are testing IDR and find that the behavior is completely random. Sometimes it recognizes the invoice lines for PO-matched invoices, sometimes it does not. I have not been able to find any documentation detailing how IDR recognizes lines and what customers can do to enhance recognition.

If there is documentation that addresses this, please let me know where I can find it.

Version (include the version you are using, if applicable):

22A

Code Snippet (add any code snippets that support your topic, if applicable):