@ATCO2: thanx for your post.
Basically that was my question, is there anywhere in the ICAO documents anything about visual approach and FL100?
Since you wrote "Wait for that to be written somewhere in national regulation to be applicable to your airport.", I guess there isn't
My only mistake was actually that I didn't specify
ICAO docs when starting the thread
Sorry
But it was interesting to read what it's like in other parts of the world.