Kernrechtsfrage
Whether the employee had already forfeited any claim because the 13th salary was allegedly paid without entitlement
Extrahierter Entscheid
The 13th salary was expressly agreed in the individual contract as monthly wage plus 13th salary without a time limit; the wage deduction dispute could not be sustained on that ground.
Extrahierte Begründung
The individual contract derogated from the collective agreement in favor of the employee and validly provided for a 13th salary. The cantonal court's result was therefore not arbitrary, even if for different reasons.