Percentage pay. Those who are paid according to a percentage scale shall be paid hourly remuneration based on their average income, excluding supplements for overtime and public holidays/feasts, in the last calendar year for the relevant division in the enterprise. The amount shall be determined every January by agreement between the enterprise and the shop stewards and shall be applicable for the current calendar year. The parties particularly draw attention to the provisions in § 5-10 of the Basic Agreement, stipulating that a shop xxxxxxx shall not be given a warning in writing on grounds of exercise of his/her office without due reason.