Possessory action for reinstatement of possession. Dispute concerning a real property purchase and sale contract. Adhesion contract. Adhering party that took the initiative to submit the dispute to arbitration. Inadmissibility of the allegation that the arbitral tribunal would lack coercive power to order reinstatement of possession, given that the arbitration award is a judicial execution instrument. Dismissal of the case without resolution on the merits. Setting of attorneys' fees at BRL 800.00 by equitable assessment: