Permissions - role could be assigned to itself as a child role

entity/RoleChildren_entity/entityfields/child_role/dropDownProcess.js

@@ -4,10 +4,11 @@ import("system.result");
 
 var sqlStr = "select ASYS_ROLES.ROLENAME from ASYS_ROLES";
 var roleNames = db.array(db.COLUMN, sqlStr);
+var parentRole = vars.get("$param.RoleId_param");
 var childRoles = [];
 
 for each (let roleName in roleNames) {
-    if (roleName != vars.get("$field.PARENT_ROLE")) {
+    if (roleName != parentRole) {
         childRoles.push([roleName, roleName]);
     }
 }