paragraph 219 in volume 2, chapter 13, Matters of Jurisdiction
In substance, the notion of preliminary objection is broad enough to cover any kind of plea raised by a party to attack the validity of the seisin of the Court or of the proceedings on the merits or the ability of the Court to render a decision on the merits, and that party must request the suspension of the proceedings on the merits so long as the objection is outstanding. Objections to the jurisdiction can usually be easily …