Working while on sick leave without contradicting medical advice does not constitute a serious breach of duties.

The Supreme Court dismissed the cassation appeal against a labor court decision that terminated an employee's contract for allegedly serious breach of duties. The employee worked part-time while on sick leave for hypertension, but the work did not contradict medical recommendations or worsen his health. The court held that performing duties according to medical advice precludes a finding of abuse of social benefits or serious breach of obligations.