// Product
        if ($Product && $productId > 0) {
            $qb->andWhere('t.Product IS NULL OR t.Product = :Product');
            $parameters['Product'] = $Product;
        } else {
            $qb->andWhere('t.Product IS NULL');
        }

        // ProductClass
        if ($ProductClass && $productClassId > 0) {
            $qb->andWhere('t.ProductClass IS NULL OR t.ProductClass = :ProductClass');
            $parameters['ProductClass'] = $ProductClass;
        } else {
            $qb->andWhere('t.ProductClass IS NULL');
        }