From Shader builder to Shader Mix

almahiedra

I create a function in shader builder, and a surface shader based on it. This work very fine, I obtain just the render I wanted. Then, I export this function to *.dsx for create a shader mixer block, but the surface shader in shader mixer doesn't work, I obtain a simple white surface in render. My shaders only need the "in" parameter "faceforward(normalize(N),I)" and I create it for both shaders. Is there some know bug with dsx exports?