A Member State may, when giving the notification referred to in Article 11 (2), declare that it shall not be bound by paragraph 1 of this Article in one or more of the following cases:
(a) if the facts which were the subject of the judgement rendered abroad took place on its own territory either in whole or in part; in the latter case this exception shall not apply if those facts took place partly on the territory of the Member State where the judgement was rendered ...
