(5) Notwithstanding the provisions of paragraphs (1) and (2) of this Article, where a person—other than an agent of an independent status to whom paragraph (6) of this Article applies—is acting on behalf of an enterprise and has, and habitually exercises, in a Contracting State an authority to conclude contracts on behalf of the enterprise, that enterprise shall be deemed to have a permanent establishment in that Contracting State in respect of any activities which that person undertakes for the enterprise, unless the activities of such person are limited to those mentioned in paragraph (4) of this Article which, if exercised through a fixed place of business, would not make this fixed place of business a permanent establishment under the provisions of that paragraph.