Asterisk doesn't appear when an attribute is made mandatory through condition script

I want to make my custom made "SA Priority"(labelled as Priority) attribute mandatory , if the "backward_compatible_network is set to "Incompatible Value". For this, I have created javascript condition as below.

dojo.provide("org.example.workitems.providers.Test_SA_Priority_Mandatory");
dojo.require("com.ibm.team.workitem.api.common.WorkItemAttributes");
(function() {
   dojo.declare("org.example.workitems.providers.Test_SA_Priority_Mandatory", null, {
     matches: function(workItem, configuration) {
 
      var WorkItemAttributes= com.ibm.team.workitem.api.common.WorkItemAttributes;
      var sa_backward_compatible_network = workItem.getValue("backward_compatible_network");
      var sa_priority = workItem.getValue("sa_kpi_priority");
       
  if ((sa_backward_compatible_network === "SA_KPI_Backward_Compatible_Network.literal.l4")
           ) {
   return true;
      }
 }
   });
 })();