Employee's unilateral vacation start without employer consent constitutes unjustified absence and valid dismissal grounds.

The Supreme Court dismissed the employee's cassation appeal seeking reinstatement after his employer terminated his contract due to unjustified absence. The court found that although the employee was not included in the annual vacation plan due to long-term illness, he could not unilaterally decide to start his vacation without the employer's consent. Consequently, the court ruled that his abrupt departure and failure to return to work constituted a serious breach of duties justifying the dismissal.