MTO AR Invoice Goes To Review Journal (not balanced)

Thanks Brett, I really think this would help me ID where the problem is.
However, after enabling the AR Invoice (heck I even enabled ALL for the company in question) and logging out and back in and attempting both a repost AND revalidate in the Review Journal, when I attempt to bring up the PE Log Viewer I get the error message: ‘Impossible load information from PE Log’
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I looked for a file in the location specified on the Settings tab as Export & Import File and there was no pelog.xml, so I created it and re-enabled, still nothing.
Not sure what else to do to get this working.

When I attempted to use the search to recall a PE Log, I get the error ‘Logging file is empty.’
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Is there some sort of initialization to create the log file?
It sounds like the log file is an actual file and not stored in the database.
Any help anyone can provide would be appreciated.