JBO-27020 when the view has two or more entities

I created a default view object for an entity and it did well. But when I append another entity in the view and try to update any field I get a JBO-27020 error (blablabla could not be resolved.).
I4m using JDeveloper Release 2 (9.0.2.829).
I read a lot of messages regarding this error and tried all the workarounds posted, but none of them solved my problem.
Thanks...

Is that correct? Every entity used in a view must have an association between then?Or they should atleast be linked by some join condition. Otherwise the result would be a cartesian product of two tables. Even that's okay. However that still doesn't answer why you were getting the Unresolved... exception. To get more clues on that you may want to post the stack-trace on that exception and/or the diagnostic output for your test-run.

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