Inquiry to display configuration attributes with invoiced lines duplicating records

We have two attributes tied to configurations. We would like to display the value of the attribute in the invoiced line item inquiry. The inquiry is working except that there are two records generated for the invoice lines with configurations. I’ve tried various join types and can’t get the inquiry to return one record per invoiced line. Here are snips from the system:

The inquiry returns the correct number of records if I deactivate the relation to AMConfigResultsAttribute and the related fields in the grid, so I’ve narrowed it down to that part of the inquiry. Any suggestions on how to eliminate the duplicates would be greatly appreciated.

Thanks!