Ok everything works fine for me, just one thing is messing up:
when i try this in the editor i start my mission with all files included and a shop,
i set my rating in the debug console with
player addRating xxx;
and open the shop.
My Balance is then xxx and i buy a wepon and ammunition, then i checkout and get everything, but my balance won't change even if i do it again and again.
Is it a problem when i try it on a Multiplayer game hosted through the editor? Or have i forgotten something important?