Complex disabled in Add Function import in edmx

The Complex radio button is disabled in add function import in edmx. Due to this i'm not able to set the return type as Comple开发者_如何学Pythonx.

How can i enable it?

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This happens if you are using Visual Studio 2010 and EFv1 = .NET 3.5 SP1 where returning complex types is not supported. It is new feature in EFv4 = .NET 4.0