If you are using Telerik Reporting prior to Q1 2010, use the DataMember property of the report to set explicitly the table you would like to use. This is needed as the report can be bound to a single table only. If your DataSource contains more tables, you can bind a separate report to it and take advantage of the SubReport item or use Table/List/Crosstab item to directly show data in the main report. For example you can bind your header data to a separate data item such as List and bind the report to the actual data.
If you are using Telerik Reporting Q1 2010 - you should use the ObjectDataSource component as DataSource and set its DataMember instead.
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