protected function setItemSupplier($item, $product)
    {
        // get products supplier
        if ($product->getSupplier()) {
            $item->setSupplier($product->getSupplier());
            $item->setSupplierName($product->getSupplier()->getName());
        } else {
            $item->setSupplier(null);
            $item->setSupplierName('');
        }
    }