Some abilities have hard coded hotkeys that cannot be changed, I've experienced.. so no matter what you wirte down in the field, they won't change.
Try your keyboard from one end to the other and see if you can find a key that works for that ability - if so, no you know the flaw
Thanks for answering my posts. It's just as you said ThaAthel, the hotkeys work only with their original letter. Since almost all are base on channel, I can forget about hotkeys. +rep to all of you and thanks again.