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Set up avoid duplicate problem

  1. #1
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    Set up avoid duplicate problem

    Dear All

    Encl pls find the excel file for your reference.

    I have problem to avoid duplicate in Column F.
    The result of Column F is combination of Column B, D & E

    I have no problem to set up the data validation on column F .
    If I type manually on Column F, they have no problem to show error message & refuse the data;

    However, it does not work when I change the value on either B, D & E even the result are the same on column F.
    Can everybody can assist ? Tks in advance

    Rgds / AL
    Attached Files Attached Files

  2. #2
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    Re: Set up avoid duplicate problem

    For B2:B....,D2:d..., and E2:E..., apply custom data validation with the formula

    =COUNTIF($F:$F,$F2)=1
    Bernie Deitrick
    Excel MVP 2000-2010

  3. #3
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    Re: Set up avoid duplicate problem

    Tks Brenie - you are the best !

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