Thank you for pointing this to us. The problem is that the actual rendering of the report when executed through the Report Service is performed in a different thread and not in the thread of the request. As the OperationContext.Current returns the execution context of the current thread you end up with no context for the rendering thread.
The issue will be logged in our bug tracking system and fixed for the next build. We apologize for the inconvenience. As a small compensation we have added Telerik Points to your account.
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