We are displaying the approver on our sales order report. We bring this information in as follows:

I have a situation where the same approver is in two approval maps rules (one inside of a workgroup and one as an individual). So when he approves a document, it comes through twice.

This is now causing the detail lines on the sales order print out to duplicate. I would like to group by the key field here, which is RefNoteID, but I get errors when doing this because it is not a normal numerical ID.
Any suggestions? There might also be cases where there are two approvers who are not the same person, so grouping on Approver ID is probably not ideal, but maybe a work around for now because I only need to display one approver on the report. Still wondering if there is a better way though?