Display Alert When A Number In Column Has Already Been Entered

Jun 17, 2008

My colleague in accounts has a sheet that lists all the invoices and values and other 'accounts department things' that I know little about.

Anyway, she has to manually input all the invoices she receives onto this excel document but sometime receives duplicate invoices (& inputs them twice be accident).

Is it possible for someone with macro skills to create a macro to run in a worksheet so that if she enters a number in a given column more than once an alert box appears to tell her. I've summarised the 'rules' below*

*Can is be written so that I can edit which column the alert is based on?

[In (for example) column F is a list of invoice numbers - all unique]

If user types a number in column F that matches a number that already exists, show alert box "THERE APPEARS TO BE A DUPLICATE ENTRY IN COLUMN F"


Any further clarification, let me know i'll try to post a blank sheet if my boss lets me.

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