173. The Groupement must establish a direct compensation agreement regarding:(1) the direct compensation for property damage sustained by an insured person by reason of an automobile accident;
(2) the appraisal of damage sustained to automobiles, and the necessary adjustments;
(3) the tabulation of accident circumstances to apportion the liability of the owner of each automobile involved;
(4) the establishment of an arbitration board to decide disagreements between authorized insurers arising from the application of the agreement;
(5) the exercise of the right of subrogation between insurers.