Key legal question
Whether the agreed salary increase to CHF 4,800 was valid and continued after June 2004
Extracted holding
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.
Extracted reasoning
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.