Hiding disability status to avoid medical contraindications constitutes a serious breach of employment duties under Polish law.

The Supreme Court dismissed the employee's cassation appeal regarding wrongful termination and overtime pay claims. The court found that concealing a disability classification to mislead the employer about medical contraindications to work is a serious breach of basic employee obligations. Furthermore, the court ruled that Article 133 § 1(2) of the Labor Code does not grant employees the right to unilaterally work overtime without employer instruction or genuine business need.