wow! stubborn little child!
anyways… you did not search the forum that well… here’s the answer!
=If(IsError(If(Rank(<measure>;<dimension>) < 3;<dimension>;"Other") In(<dimension>));"OTHER";If(Rank(<measure>;<dimension>) < 3;<dimension>;"Other") In(<dimension>)) you can find the answer here: https://bobj-board.org/t/139201
READ THE TOPIC THOROUGHLY.
R.A. 
(BOB member since 2008-10-28)