Collective company agreements on actual salaries may only be filed with the administrative authority, under the conditions set out in article L. 2231-6, if accompanied by a report on the opening of negotiations on pay differentials between women and men, recording the respective proposals of the parties. The minutes certify that the employer has entered into negotiations seriously and fairly. The serious and fair commencement of negotiations implies that, in companies where one or more trade union sections of representative organisations have been set up, the employer has invited the trade union organisations that are representative in the company to the negotiations and has set the venue and timetable for the meetings. The employer must also have provided them with the necessary information to enable them to negotiate in full knowledge of the facts, and must have given a reasoned response to any proposals made by the trade union organisations.