The 9th Civil Chamber of the Court of Cassation ruled that, under Articles 22 and 62 of Labor Law No. 4857, a material change (reduction) in an employee's wage is valid only with the employee's written consent, and that wage reductions to which the employee has not expressly consented do not bind the employee. However, it noted that if the employee has signed a new employment contract containing the reduced wage, the reduction becomes valid as of that date, and no wage differential may be claimed for the period thereafter.