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preventing a duplicate cell entry

  1. #1
    Registered User
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    04-01-2013
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    Michigan, USA
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    Excel 2012
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    preventing a duplicate cell entry

    I have an spreadsheet column with merged cells. I would like to find a formula that would check the previous cell for a duplicate and return an error message. I have tried this formula"=COUNTIFs($A$1:$A$10001,$A1)<=1" but it does not work for merged cell. Please may I have help with coming up with a formula I can plug into Data vaildation scheme tha will not allow the same number to exist in a column of cells.

  2. #2
    Forum Expert
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    12-11-2011
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    Netherlands
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    Re: preventing a duplicate cell entry

    Use 'countif' in stead of 'countifs'
    I think this will work:
    =COUNTIF($A$1:$A$10001,$A1)<=1
    Willem
    English is not my native language sorry for errors
    Please correct me if I'm completely wrong

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