Hi there.

In a sheet, I've got a validation list that contains the values to select
(ex: 1,2 3, 4, 5) and I select the value "1" on the first cell, then, in the
same column, second cell, if I choose the value "1" again, I want that apears
a msgbox saying that value is allready there and when I click in the button
on the msgbox, that second cell keeps blank, is it possible?

tku,