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Thread: validation and other question

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    I'm looking for some way to tell if an invoice has already been input. I have a spreadsheet with 8 pages where we input our invoices. I need to prevent a duplicate entry with a msgbox warning. I have tried using data validation on a previous spreadsheet but that didn't produce the results I wanted. We input the invoice number in C9:C38, on all eight pages. If a duplicate entry is made I need to notify the user of the fact.

    Sorry the other question I will work on first before I ask for help.

    Thanks,

    I appreciate the help from everyone at Mr. Excel.

    viper

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    MrExcel MVP Aladin Akyurek's Avatar
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    On 2002-02-25 17:23, Dan Aragon wrote:
    Click here for answer...
    Dan,

    I'd like to see the ISNA+VLOOKUP formula up there changed to:

    =COUNTIF($A$1:A8,A9)=0

    Aladin

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    Thank you both. I will try both.


    I appreciate the help from everyone at Mr. Excel.

    viper

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