I would expect either a data model related issue or something related to AGGR being needed as the two most likely culprits, so unless you can attach a sample QVW with the issue, not sure anyone is going to be able to offer much further help. The best I could do is point you to the Design Blog area to dig around there to see if you can find some posts that will help you sort out what is missing.
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To help users find verified answers, please do not forget to use the "Accept as Solution" button on any post(s) that helped you resolve your problem or question. I now work a compressed schedule, Tuesday, Wednesday and Thursday, so those will be the days I will reply to any follow-up posts.