InfoMaker Question

I've been working on trying to modify a custom report for almost a week now and I'm about ready to throw my hands up and give up in defeat.  I'm trying to group in InfoMaker and this is a new thing for me.  I feel like I understand how it should work, but I'm running into a really frustrating issue.  One of my groupings is by MOS but when I run the report, I'm getting "gooesoft_report_parameter.data_column" where the MOS should be.  I believe this has something to do do with Report Set up, but I can't figure out what is wrong with it.  When I run the SP in SQL, it generates what I would expect the report to be displaying.  The MOS displays properly.  Has anyone else had this happen and can tell me what I may have done wrong with either InfoMaker or my Report SetUp?