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Michal RentschlerMichal Rentschler 

Using Basic Logic in Checkbox Formulas - Part II

I know I'm trying to do the equivalent of Economic Analysis without having done Calculus, but I've gotten this far and just need to know how to correctly append the error message to :

AND(CloseDate < TODAY(), NOT(IsClosed))

Is there a correct modifier to put before the phrase: "Hey McFly, unless you are planning to go back in time, please update your close date"?
Is it supposed to be part of the formula, or on a separate line?