Supreme Court dismisses appeal, ruling unfavorable collective agreement changes require specific termination procedures.

The Supreme Court dismissed the cassation appeal filed by the employer against a lower court's judgment in favor of the employee. The court held that a collective guarantee package constituted a source of labor law under Article 9 of the Labor Code, meaning its modification required a specific terminating notice under Articles 42 and 24113 § 2. Since the employer failed to provide this notice when introducing less favorable terms, the changes were deemed ineffective, entitling the employee to the original compensation.