Kernrechtsfrage
Whether the agreed salary increase to CHF 4,800 was valid and continued after June 2004
Extrahierter Entscheid
The salary increase was validly agreed and was not subject to a written-form validity requirement or to a condition tied to the employee's role as branch manager.
Extrahierte Begründung
The written-form clause was not a validity condition. The employer failed to prove a resolutive condition or the employee's consent to the later salary reduction.