I know this is kind of old and you've probably resolved your issue, but I just ran into something very similar and thought it might help someone else. In my case, the Retained Earnings account segment was not set up in GP. Tools->Setup->Financial->Segment. Set it up. Rebuild the datamart and there it is. Funny that it worked in FRx. Might want to check those GP account segments if you're missing accounts in Management Reporter.
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