>> I normally create a custom report bizobj that makes the necessary calls for me. Ideally, I'd like to use my bizobjs that are responsible for the data I'm building the report on, but the reality is that most of the reports I've done don't work out that way. So, I just encapsulate the calls needed in this "Report" bizobj and call it instead. The logic can still be located in the middle tier, which talks to the backend, and it returns my report.
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>Are you using a commercial framework?

Yeah, I'm using Mere Mortals.