I don't have an option to install paid plug ins. So here is what I tried.
The Boolean expression {Priority} == "High" must evaluate to true .
The Boolean expression {Defect Root Cause} == "None" must evaluate to false .
Out of these two, the first validator works where as the defect root cause doesn't. Defect Root cause is a single select custom field. Is there any other way ( I cant use any paid plugins )
My requirement is that the user will be able to move to next status only if its value is other than None. Please let me know if there is any solution.