7[[Article 19)]] Where a court is seised of a claim which is principally concerned with a matter over which another court has exclusive jurisdiction by virtue of Rule 4, or where it is precluded from exercising jurisdiction by Rule 4(3), it shall declare of its own motion that it has no jurisdiction.
8[[Article 20)]] Where in any case a court has no jurisdiction which is compatible with this Act, and the defender does not enter an appearance, the court shall declare of its own motion that it has no jurisdiction.