I have a very simple validation script , which compares a date added to the created date and if there is 6months after then it will NOT show an error but if it is before 6months after the created date then it will complain.. It works once, but when you edit that column it just errors no matter what you enter :
=IF(TAtestColumn>DATE(YEAR(Created),MONTH(Created)+6,DAY(Created)),TRUE)
So first time around if the date is 6 months in the future it works , but editing the list item afterwards the formula does not work
Any ideas ?