Why can't I put an edgeloop on a face with four sides (polygon)?

I provided an example at the Drive link below. As you can see, when I try to add edge loops to that face it doesn’t appear on that top face but they do appear along the sides and underneath the object but for some reason isn’t appearing on top. And how can I fix this?


(file wasn’t working for me yet, error try again later, maybe too embeddedd pictures would suffice?? no ectra download, directly visible) Anyway: maybe the face is not a quad?

As far as I can see, it is no quad, it is a n-gon. Could try to disable the bool-object.