Contract Extension Validity and Exclusive Right to Sell Dispute

A dispute arose concerning the interpretation of a contract stipulation that bound a party to an exclusive right of sale for a certain period, which was unilaterally extended by the other party without the first party's consent, leading to a claim for damages following the sale of the property to a third party. The court of cassation overturned the lower court's decision because the unilateral extension of the exclusivity period, lacking the required reciprocal consent, could not legally bind the party whose obligation was extended, thereby invalidating the grounds upon which the claim for breach of the exclusive right was based.