SQL Server Reporting Services 2012 Projects with Visual Studio 2012 - Learning SQL Server Reporting Services 2012 - page 73

The default name is Data Source1 , and you may choose a different one.
Here, it is DSNW . Click on the handle for Type . The drop-down list in the
next image displays (only a part of the screen is shown) many other data
sources from which you can fill a report:
You may notice that you can use a Report Server Model. Although you
cannot create a Report Server Model using SSDT, you can still use report
models from the earlier versions of SQL Server.