Questione giuridica chiave
Whether the invalid contractual probation clause should be replaced by the statutory notice period or by the later contractual six-month notice period
Decisione estratta
The invalid probation arrangement was replaced by the statutory one-month notice period, not by the later six-month clause.
Motivazione estratta
The parties had intended the shortest possible notice period until the end of August; it was not plausible that they would have chosen a much longer six-month notice period if the shorter clause proved unlawful. Partial invalidity under Art. 20(2) OR requires preserving the contract as close as possible to the parties' intent.