Hi stavros sotirchos,
We are experiencing some issue regarding more complex join situation such as yours. We are working on improving this. However the fix might not be included in the following release. We will add these scenarios in our test suite and work on them after the Q3 release.
However for the time being, can you please give us a little more insight on what you are trying to accomplish as surely this query could be split into two (or more) simpler queries that would execute.
I am looking forward to resolving this issue and I am sorry for any inconvenience caused.
the Telerik team
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