Art. 155. [unpaid vocational training leaves]
(1) The unpaid vocational training leave shall be taken at the request of the employee, for the length of the vocational training that the employee attends on his/her own initiative.
(2) An employer may reject the request of the employee only with the agreement of the trade union or, as the case may be, the agreement of the representatives of the employees and only when the absence of the employee would be highly detrimental to the course of the activity.