paragraph 218 in volume 2, chapter 13, Matters of Jurisdiction
Formally, there are no conditions as to the precise moment at which a party should raise a matter of jurisdiction. In practice, in view of the principle of prorogated jurisdiction, objections genuinely preliminary in character ought to be raised before the interested party joins issue on the merits. Up to the 2000 amendment of Article 79 of the Rules (in force as of 1 February 2001) preliminary objections had to be filed at th…