The Commission shall be empowered to adopt delegated acts in accordance with Article 284, laying down the rules under which goods, whose determination of non-preferential origin is required for the purposes of applying the Union measures referred to in Article 59, are considered as wholly obtained in a single country or territory or to have undergone their last, substantial, economically-justified processing or working, in an undertaking equipped for that purpose, resulting in the manufacture of a new product or representing an important stage of manufacture in a country or territory, in accordance with Article 60.