Запретить некоторым сотрудникам ставить задачи БЕЗ крайнего срока

AddEventHandler("tasks", "OnBeforeTaskAdd", "MyOnBeforeTaskAdd");
function MyOnBeforeTaskAdd(&$arTask){   
   if(empty($arTask["DEADLINE"]) && CModule::IncludeModule("tasks") && CModule::IncludeModule("crm") && CModule::IncludeModule('intranet')){
      $arTaskForCheck = [         
         "CREATED_BY" => $arTask["CREATED_BY"]?? $USER->GetID(),
         "RESPONSIBLE_ID" => $arTask["RESPONSIBLE_ID"]?? $USER->GetID(),         
      ];
      CheckTaskEmptyDeadLine($arTaskForCheck);   
   }

}
AddEventHandler("tasks", "OnBeforeTaskUpdate", "MyOnBeforeTaskUpdate");
function MyOnBeforeTaskUpdate($id, &$data, &$arTask){   
   $deadline = $data["DEADLINE"] ?? $arTask["DEADLINE"];
   if(empty($deadline) && CModule::IncludeModule("tasks") && CModule::IncludeModule("crm") && CModule::IncludeModule('intranet')){
      $arTaskForCheck = [         
         "CREATED_BY" => $data["CREATED_BY"] ?? $arTask["CREATED_BY"],
         "RESPONSIBLE_ID" => $data["RESPONSIBLE_ID"] ?? $arTask["RESPONSIBLE_ID"],         
      ];
      CheckTaskEmptyDeadLine($arTaskForCheck);   
   }
}
function CheckTaskEmptyDeadLine($arTask){
   $needDepartments = [1609, 1610, 1611, 1612, 1242, 1292, 181, 183];
   $arDepartments = CIntranetUtils::GetUserDepartments($arTask["CREATED_BY"]);   
   if($arTask["CREATED_BY"]!=$arTask["RESPONSIBLE_ID"]){      
      $arDepartments = array_merge($arDepartments, CIntranetUtils::GetUserDepartments($arTask["RESPONSIBLE_ID"]));
   }
   foreach($arDepartments as $departmentId){
        if(in_array($departmentId,$needDepartments)){
            if(CModule::IncludeModule("im")){
            global $USER;
            $arFields = array(
               "NOTIFY_TITLE" => "Ошибка: крайний срок задачи пустой", //заголовок                                
               "MESSAGE" => "Менеджеры ОПМ не могут ставить и исполнять задачи без срока",
               "MESSAGE_TYPE" => IM_MESSAGE_SYSTEM, // IM_MESSAGE_PRIVATE, IM_MESSAGE_CHAT, IM_MESSAGE_OPEN, IM_MESSAGE_SYSTEM, IM_MESSAGE_OPEN_LINE
               "TO_USER_ID" => $USER->GetID(),
               "FROM_USER_ID" => $USER->GetID(),
               //"AUTHOR_ID" => $userIdOther, //может отличаться от FROM_USER_ID
               
               "NOTIFY_TYPE" => IM_NOTIFY_SYSTEM,  // IM_NOTIFY_CONFIRM, IM_NOTIFY_SYSTEM, IM_NOTIFY_FROM
               "NOTIFY_MODULE" => "main", // module id sender (ex: xmpp, main, etc)
               "NOTIFY_EVENT" => "manage",                                  
            );
             CIMMessenger::Add($arFields);
         }
         throw new SystemException("Error empty deadline");
        }
    }
}