DB, I absolutely agree that it's basic common sense and any of my colleagues would agree - yet, for perhaps a number of reasons, it seems to have happened here.
Apologies if my previous post seems to be of the "we are so special" variety; I'm certainly not and wouldn't want anyone to believe that I thought that way, but my point was that the training that my colleagues and I receive is rather better than certain posters on here would like to think (or like others to think). Yes, there's the bleeding obvious, but there's also an inordinate amount of spurious nonsense!