Kernrechtsfrage
Whether the appellants had to join the appeal together with a third co-builder as necessary co-litigants.
Extrahierter Entscheid
No; the objection was unfounded because the record did not show a necessary joinder and individual proceedings against each actor were not excluded.
Extrahierte Begründung
Necessary joinder depends on substantive law. The respondents failed to establish an ordinary partnership or another relationship requiring a single uniform decision for all involved.