MORE THAN 1 OF THE DETAIL FOLDERS USES NON-AGGREGATED ITEMS

What does this join configuration message mean? I am a user not an administrator but I notice that sometimes I get this message when I am trying to create reports in Discoverer.
Currently I have a report that is using a control table and a detail table. I need to link to another table (not a detail table). The join did not exist but I was able to take a transaction and join to the table with sql. I asked that this join be created in Discoverer so I can link to the other table in the report and it was created, but when I go to pull in the field I need I get this message:
Join configuration cannot be resolved. Reason: more than 1 of the detail folders uses non-aggregated items.
Can this be resolved and if so how? We seem to get this message fairly often.

I am always leery of disabling fan traps, as it can cause errors with aggregation (and by errors, I mean including values multiple times). Make sure you check the documentation (the Disco user guide) for an explanation of fan traps, and the types of problems that can occur, and the check the results of your queries (or have the data owners do it) to make sure the results are valid.
I use the fan trap warning as an indication that there is something amiss in the BA, and then try to find the problem there. Sometimes the solution is changing a join (you can check the box that states there is a 1 to 1 relationship and that will also eliminate the fan traps), other times it is creating a view or custom/complex folder to specify how the data is to be joined. Rarely is the only solution to disable fan traps (and while I am on my soapbox, I'll add that I use it as a last resort).
Sometimes removing fan traps is the correct solution, but you need to test your reports to make certain the results are valid.

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