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Not allow duplicate External Document No. on sales order

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I have to put validation on external document no on sales order that it should not take duplicate number i had written code unite for this but that is not working.
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    gdrenteria Profile Picture
    gdrenteria 2,788 Super User on at
    Not allow duplicate External Document No. on sales order
    Hi
    Here some information, i hope this can help you
    Best regards
    Gerardo
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    Judy Profile Picture
    Judy Microsoft Employee on at
    Not allow duplicate External Document No. on sales order

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