Kernrechtsfrage
Whether the appellants could offset the mortgage debt with an assigned damages claim against the respondent
Extrahierter Entscheid
No. The alleged damages claim was not sufficiently proven and therefore was not eligible for set-off.
Extrahierte Begründung
Damage under Art. 42 OR must be proven; the appellants failed to show an actual or nearly certain loss caused by the respondent's conduct.