Can a StructuredBuffer be used with a SurfaceShader?

Hi, I'm getting wierd error messages when I try to use a StructuredBuffer in a SurfaceShader. The editor complains that he can't find the other properites in the shader and gives me a syntax error on the line of the StructuredBuffer's declaration. I tried different #pragmas like target 4.0 or only_renderers d3d11 but none work. The StructuredBuffer works fine when I write normal vertex and fragment shaders, but I'm a little reluctant to write the lightning by myself if it could be possible to use a comfortable SurfaceShader ;)