Traders and persons registered in the national register of companies as businesses in the trades and crafts sector, who are tenants of the premises in which their business is located, are exempt from the obligation to operate for the duration of their traineeship, if they are accepted to follow a conversion traineeship or a promotion traineeship within the meaning of article L. 900-2 (3° and 5°) of the Labour Code, the minimum duration of which is set by decree and the maximum duration of which may not exceed one year unless it is a so-called promotion course benefiting from the approval provided for in article L. 961-3 of the said code.