Failure to appeal employer's termination within the legal deadline dismisses the employee's reinstatement claim regardless of termination legality.

The Supreme Court dismissed the cassation appeal filed by an employee seeking reinstatement after his employer terminated his contract due to theft. The employee argued that his medical leave prevented him from appealing the termination decision within the statutory timeframe. The court ruled that missing the appeal deadline under Article 264 of the Labor Code automatically bars the claim, rendering the substantive legality of the termination irrelevant.