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I want to check that if condition is not true in If condition that
Posting Date should be >= GetRangeMin(Posting date) and GetRangeMax <= (Posting Date). then it should display message.
IF NOT (your condition) THEN
IF I am not wrong you want something like this:IF ((Posting Date >= GetRangeMin(Posting date)) AND (GetRangeMax(Posting Date) <= Posting Date)) THEN
As Mohana mentioned you could use IF NOT. Could you tell us what is your requirement and you condition does not look right to me.
You can find this condition in Codeunit 13, where it checks posting date is in range of allowed posting date for user.