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Caculated column formula for user name Compare

Posted By:      Posted Date: September 17, 2010    Points: 0   Category :SharePoint
Hi , i  have a formula in sharepoint 2010 (form library->validation setting-> formula $ userdefine message)  example : =username =<"2" user messge  your request is already existing ,,, i have  1fields that user name but i need formula for is user already existing two time we did not allow  3 time i am using of validation setting and formula in sp2010 Regards Raju

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