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Data Validation - One entry per column

  1. #1
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    Data Validation - One entry per column

    Hey All,

    I want to have a column (for each day of the month), and each row correspond to a person. I want it that once one perosn enters an "X" into a cell in their row, this blocks all other people (rows) from putting an "X" in that same column.

    I tried using data validation on each row, for example on the 1st of the month, Counta(b2:b50)<=1, but it doesnt allow any cell on that column to have data entered.

    Thanks

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    Re: Data Validation - One entry per column

    try
    =COUNTIF(A:A,"X")<2
    or
    =COUNTA(A:A)<2
    or
    =COUNTA(b2:b50)<2
    Wayne
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