Question juridique clé
How should the contested pension guarantee clause be legally qualified: surety, guarantee, or cumulative assumption of debt?
Solution extraite
The cantonal court's qualification cannot stand because the clause was interpreted without sufficiently considering the concrete contractual context; the case must be re-examined.
Motifs extraits
Objective interpretation under Art. 18 CO requires the wording to be read together with the negotiations and circumstances. On the existing findings, it is not plausible that the buyers would have undertaken a classic surety for an obligation already regarded as due and solvent; the factual basis is incomplete.