expense policy of flight fare is not getting applied correctly based on flight duration

Summary:

I have defined a expense policy for flight fare where the employee is not eligible for international flight class and can only avail domestic flight class if the duration of journey is more than 8 hours.

When I am creating expense below 8 hours by selecting the expense template where this policy is linked, I am not getting any warning or error of policy violation and it is allowing me to create and save the expense. I have attached the document having screenshot of the policy which I have defined.
Can you please help me knowing if the policy is defined correctly or not and what is the reason of not showing policy violation.