Employee must repay employer's work accident compensation paid under mistaken legal belief.

The Supreme Court dismissed the cassation appeal against a lower court ruling ordering an employee to repay work accident compensation paid by his employer. The employer had paid the employee twice, believing a legal obligation existed, while the employee argued he acted without knowledge of the duty to repay. The court held that the statutory exemption from repayment requires the payer to have actual knowledge of the lack of obligation, which the employee lacked due to a mistaken legal belief.