Hi,

I assume that you're using Basic syntax? Anyway, the formula looks fine. Something else must be going on behind the scenes that you aren't noticing.  To debug this, I would check to make sure you did the other steps correctly. For example, just go into the formula editor and put

formula = true

and make sure that this suppresses it. If not, figure out if you missed something or if something is overriding the value. Then go back and clean up the formula (although it looks fine to me).