public function __construct()
 {
     /*
      * select some data, we will use them for new items
      */
     PlentyItemDataPushCategory::getInstance()->execute();
     PlentyItemDataPushWarehouse::getInstance()->execute();
     PlentyItemDataPushProducer::getInstance()->execute();
     $this->warehouseId = PlentyItemDataPushWarehouse::getInstance()->getFirstWarehouseId();
 }