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Default Unique numbers entered once only

I am having a problem with a client using Excel to record receipts issued
to her clients.
Looking at the data she has entered it appears that she has entered some
receipts twice. Is there any way one can enforce unique integrity on a data
column so that if the operator tries to enter the same number it will be
rejected or ring warning bells ? If you can offer any suggestions it would be
much appreciated.




 
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