I was trying to run a report for a client in management reporter. I received and error I had not come up against. The message was the report has a reference to a dimension called main account category. I then looked at the row definition and found that it referenced not only the GP categories but also had a column referring to AX. To fix this I opened the row layout. I then went to edit - row links and deleted the reference to AX. Report ran fine. Hope this helps.