Joins - What exactly is the point

OK, here is a standard Warehouse look feel on a table relationship (star schema)
Person (pk: id)
| Person.id = Course.id
-------------------------------------------------- Course (pk: id, term, course id, crn)
| Person.id = Academic_Study.id
------------------------------------------------- Academic Study (pk: id, term)
As delivered from the company Person is not joined to any folder; go figure. I decided I needed Person joined to Course and Acacemic Study and built them in the fashion you see above. Person is the Master and the other two tables are Detail. When I go to build a report, I can add one of the detail tables but when I attempt to add a second I get the error message:
Join configuratuin cannot be resolved. Reason: more than 1 of the detail folders uses non-agregated items.
Other than this error message wont let me add bring these two detail folders under the one master folder for my report, what should I have thought about when building these joins and table relationships?
I could have done this
Person (pk: id)
| Person.id = Course.id
-------------------------------------------------- Course (pk: id, term, course id, crn)
|
--- Academic Study (pk: id, term)
(I would join Course to Academic_Study on id and term)
The reason I didnt do this was because I have ran into SUMMING issues in Discoverer when this model is picked if I wanted to sum something on Course or Academic_Study.
What is it the Discoverer expects? What is a good practice when attempting to link folders together in Discoverer? Should I not be thinking of Star Schemes when linking these objects?
Any feed back on this issue is good feed back - Thanks ahead of time to all that reply.

But pre-ordering it just makes you want it more. If I got it a day earlier, say, or perhaps something else then I would pre-order it now.
What they did with James album was a really cool idea, if you buy it before a certain date you get first shot at concert tickets when they come out. Handy thing to have if you are a fan.
Sadly though the album didn't really grab me on 30 second sample and they are not touring near where I live anyway.

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