'duplicate entry' warning

davidav

New Member
Joined
Sep 10, 2007
Messages
4
Greetings to all.

I need to return a "duplicate entry" message when one is entered in an ongoing column.(all of column b, each cell must be unique). The entries are alpha-numeric, like a driver's license serial number. Thanks in advance for the help. I am a baby excel user, but love to learn.
 

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