42 (1) institutes a distinction between objections on jurisdiction and competence

Section 3
Powers and Functions of the Tribunal
Article 41
(1) The Tribunal shall be the judge of its own competence.
(2) Any objection by a party to the dispute that that dispute is not within the jurisdiction of the Centre, or for other reasons is not within the competence of the Tribunal, shall be considered by the Tribunal which shall determine whether to deal with it as a preliminary question or to join it to the merits of the dispute.