Which working conditions must be stated in writing in the employment contract?

The employment contract must state the parties, the workplace, the position, the start and duration of the employment, any probation, holiday and holiday pay, notice periods, pay with supplements and the method of payment, working hours and breaks, arrangements for shift changes, training paid by the employer, social security benefits and any applicable collective agreements. The essential items must be given no later than seven days after the employment began, and changes must be entered into the contract as soon as possible. The rules implement the directive on transparent and predictable working conditions.