Deploy a Report Builder 3.0/VS 2010 Report on SSRS 2008
Visual Studio 2010 and Report Builder 3.0 RDL reports use a new schema that is not supported by SQL Server 2008 Reporting Services. They are designed to work only with SSRS 2008 R2. Currently there is no way to publish a VS2010 Report on SQL Server 2008 without some modifications to the RDL code.