130.20. Where an agreement is reached before the arbitrator renders his decision, it shall be the subject of a resolution by the employer’s board of directors. Copies of the resolution and of the agreement must be sent to the arbitrator within 15 days following the adoption of the resolution. The agreement must contain a clause withdrawing the complaint and a renunciation by the officer of all other recourses. The benefits granted under such an agreement shall in no case be equivalent to less than 3 months or more than 12 months of salary for the officer.