Rule template for checking hours reported on holiday

Hi All,

We have a requirement to display a popup message if an employee enters hours on holiday in OTL. As per I researched, it looks like I can achieve this with Rule Templates, Rule, Rule sets. Can someone guide me what predefined Rule template I can use for my requirement? Because I tried to use few FF that is already available related to holidays but could not get the popup message. I created a rule with the rule template and then added this rule to the rule set, still could not see any popup when I tried to report hours using