Questione giuridica chiave
Whether the cantonal court erred in the damage calculation by using monthly IV benefits of CHF 3,444 instead of CHF 3,509.
Decisione estratta
The challenge to the amount of the assumed IV benefits was an unreviewable attack on facts in federal appeal; only the legal deductibility of such benefits was reviewable.
Motivazione estratta
The existence and quantification of damage advantages are separated: whether benefits are deductible is a legal question, but their monetary amount is a question of fact not reviewable under the appeal rules.