fatal error with Module/ProductAttribute/Manufacturers (oscom 3.0.3)

PHP Fatal error: Class 'osCommerce\OM\Core\Site\Admin\Module\ProductAttribute\Manufacturers' not found in \osCommerce\OM\Core\Site\Admin\Application\ProductAttributes\Model\getInstalled.php on line 25

initial sql (\osCommerce\OM\Core\Site\Setup\sql\oscommerce.sql) :

INSERT INTO osc_templates_boxes VALUES (21, 'Manufacturers', 'Manufacturers', 'osCommerce', 'http://www.oscommerce.com', 'ProductAttribute');

but class is named \osCommerce\OM\Core\Site\Admin\Module\ProductAttribute\Manufacturer.php (without 's')

the fix :

UPDATE `osc_templates_boxes` SET `code` = 'Manufacturer' WHERE `id` = '21'