how to make a textbox mandatory on "Picker Enumeration list"

I have the below script to make a textbox REQUIRED, if the value=other from a picker enumeration list is "other", but its not working. The custom attribute id is "reason_for_request1" and the literal is "reason_for_request.literal.l12"

dojo.provide("org.example.workitems.providers.ProjReco");
dojo.require("com.ibm.team.workitem.api.common.WorkItemAttributes");

(function() {
  var WorkItemAttributes = com.ibm.team.workitem.api.common.WorkItemAttributes;

  dojo.declare("org.example.workitems.providers.ProjReco", null, {
    matches: function(workItem, configuration) {
      var relnote =  workItem.getValue("reason_for_request1");
      return (relnote === "reason_for_request.literal.l12"); // Other
    }
  });
})();

I have similar conditional script working for dropdown enumeration (not multiselect). Does it mean that this conditional script doesn't work with Picker Enumeration?

Please let me know what's wrong with the script...