/**
  * Creates a default items subtotal line item
  * @param EE_Line_Item $event_line_item
  * @param EE_Event $event
  * @param EE_Transaction $transaction
  * @return EE_Line_Item
  */
 public static function set_event_subtotal_details(EE_Line_Item $event_line_item, EE_Event $event, $transaction = NULL)
 {
     if ($event instanceof EE_Event) {
         $event_line_item->set_code(self::get_event_code($event));
         $event_line_item->set_name(self::get_event_name($event));
         $event_line_item->set_desc(self::get_event_desc($event));
         $event_line_item->set_OBJ_ID($event->ID());
     }
     self::set_TXN_ID($event_line_item, $transaction);
 }