How to use Ideablade server side?

   Hello,
I've a silverlight5 application, I'm using Telerik Reporting for generating reports, Telerik Reporting uses CaliburnMicro/Cocktail to retrieve data (using an IApplicationRepository) . When I generate a file from the WebServer (in a WCF service) I got the exception that the thread used is not the one what's been istantiated before, I've fixed for now using

  public IEnumerable<IF_SP_TMR_SNAPSHOT_INDICATORE_SELECT_Result> GetSnapshotFromGaugeAvg(int idGauge, DateTime startDate, DateTime endDate,int stepping)
        {
            tmrEntityManager.Manager.AuthorizedThreadId = null; //<----THIS
            var query = tmrEntityManager.Manager.IF_SP_TMR_SNAPSHOT_INDICATORE_SELECT_AVGQuery(idGauge, startDate, endDate,stepping);

            var op = query.Execute();

            return op.Cast<IF_SP_TMR_SNAPSHOT_INDICATORE_SELECT_Result>().AsEnumerable();
        }

How can I fix it in order to avoid this workaroud? Consider I need to wait before transferring the report back to SL so I can't use the ExecuteAsync

Thanks