Teacher cannot use higher-paid safety technician hours to fill lower teaching workload quota.

The Supreme Court dismissed the teacher's cassation appeal seeking to establish a half-time employment status based on combined teaching and safety technician duties. The lower courts found that witness testimony could not determine the specific weekly hours spent on safety tasks, making it impossible to calculate a total workload exceeding half-time. The court ruled that hours from a higher-paid, non-teaching position cannot be used to supplement a teacher's statutory teaching quota, and the plaintiff failed to prove the actual time spent on safety duties.