public function getManufacturerId()
    {
        if ($this->_sManufacturerId === null) {
            $this->_sManufacturerId = false;
            if (($manufacturer = $this->getActManufacturer())) {
                $this->_sManufacturerId = $manufacturer->getId();
            }
        }

        return $this->_sManufacturerId;
    }