DataValidationCustomized
Formula: =COUNTIF(A:A,A1)=1

HTH
--
AP

"S.G.Pillai" a écrit dans le message de
news: ...
I want to avoid repeatition of the tags in the rows i am entering. ie.. if
i
have entered 98TI-107 once it should notify me if i am trying to enter it
once again.
Thanks