1201.92—Criteria for certifying interlocutory appeals.
         The judge will certify a ruling for review only if the record shows that:
    
    
        
        (a) 
         The ruling involves an important question of law or policy about which there is substantial ground for difference of opinion; and
    
    
        
        (b) 
         An immediate ruling will materially advance the completion of the proceeding, or the denial of an immediate ruling will cause undue harm to a party or the public.