Article R3124-5 of the French Labour Code
Employing a part-time employee or an employee on an intermittent employment contract without drawing up a written employment contract specifying the following is punishable by a fifth-class fine: 1° For a part-time employee other than that mentioned in 2°, the reference working time, the distribution of the working time between the days of the week or the weeks of the month and the limits within which overtime may be worked…