Time passed so I went to the dealership to fix it. For future use, the lower part of rear seat is fixed with plastic clips and you can remove it by carefully pull it up!
I mentioned the plastic clips because they seem very easy to break or loose with any affect it can have on seat stability.

Hello fellows. I'm writing you from Greece with a 9 months old Kursar (thats how I call it). So.. My case is about removing rear seat. The right seatbelt in the back is fliped and I can't mount correctly my child seat. The problem is that the seat is flipped in normal condition on it's bolt side (th...