Try this instead
=SUMPRODUCT(--($E$1:$E$1000=E2))=1
Note SP doesn't work on whole columns.
--
HTH
RP
(remove nothere from the email address if mailing direct)
"joes" <[email protected]> wrote in message
news:[email protected]...
> Hello
>
> I like to have an unique validation rule for a columen which contains
> id's. I used a therefore simple rule with the build in function
> "COUNTIF"
> http://www.cpearson.com/excel/NoDupEntry.htm
>
> i.e. "=COUNTIF(E:E;E2)=1"
>
> My id's have the format "n.nn" i.e. "1.1", "1.2", "1.3" etc. and the
> cell format is set to "text". The above rule works fine as long as I
> have the following id's
>
> "5.1"
> "5.10"
> "5.100"
>
> The problem which I have now is that EXCEL seems to convert the value
> before the COUNTIF is getting applied. It seems that it converst the
> value into a number and this results not any more into an unique id.
> So any idea's how I can suppress this automatic conversion? To chnage
> the id format is not applciable because it is already used.
>
> Many thanks for any suggestions.
>
> regards
> Mark Egloff
>
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