Assume you type in the product code in Column A, click column A header to
select the whole column with A1 as active then do datavalidation,
allowcustom and put this in the formula box

=COUNTIF($A$1:A1,A1)<=1


now try to enter a duplicate
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Regards,

Peo Sjoblom

Northwest Excel Solutions

www.nwexcelsolutions.com

(remove ^^ from email address)

Portland, Oregon




"juliocrd" wrote in
message ...

Hello, first of all, I wanna thank you for this helpfull forum, I am
just a begineer using excel, but I wanna say it is an excellent tool
for small business owner as my self.

My question is, i hava an inventory of 2000 products, and when I add
another prodcut, I usually write the product code in a cell of a
column, but at this moment I have some products with the same code, I
dont know how to discriminate those, I wanna know if somenone knows a
formula, to avoid repeat information in excel, it will be very handfull
for me.

Thanks a lot for everything.

Julio Rodriguez.


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