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Default Duplicates in a list

At one point in time I knew how to do this...

What formula do I use so excel won't allow me to put the same number in a
column twice. I want to make sure I don't enter an invoice number more than
once.
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Default Duplicates in a list

See:

http://www.cpearson.com/excel/NoDupEntry.aspx


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Gary''s Student - gsnu200811


"jlojones821" wrote:

At one point in time I knew how to do this...

What formula do I use so excel won't allow me to put the same number in a
column twice. I want to make sure I don't enter an invoice number more than
once.

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