Question juridique clé
Whether the district court had subject-matter jurisdiction despite a simple joinder of defendants, some falling under the commercial court and others under the ordinary court.
Solution extraite
The district court was not competent for the claims against the commercially qualified defendants; Aargau law does not require a single ordinary-court forum for such simple passive joinder.
Motifs extraits
Federal law does not mandate unified jurisdiction in simple passive joinder. Cantons may, but need not, provide a single ordinary-court forum. The need for two parallel proceedings is not an unconstitutional obstacle to enforcing substantive federal law.