SSD shown as external. macOS Sierra

Hello guys,

I have a successful hackintosh for around 2 months now. But I have a tiny problem. My SSD is shown as external. It was since I successfully installed macOS Sierra on my hack and I was just ignoring this problem but now I am thinking about installing Windows via Bootcamp and when I try to do it I get an error saying that the procedure is not possible on the external drive. I have found couple of forum posts about the same issue but it was for Mac OS X Mountain Lion. Any advices how to solve this ? :)