Ply or schluter ditra

[Christoffy]

Hi everyone. Am planning to tile out a new bathroom for the first time. The flooring is 22mm tongue and groove chipboard. I've read up a little but wanted to ask can i use the schluter ditra matting direct to the chipboard? Or am I better to lay some sort of ply onto the chipboard then tile onto this. Any help help is much appreciated. Thanks