Contract Nullification Due to Undisclosed Financial Misrepresentation

The case involved a dispute over the validity of a contract for the sale of a business, where the buyer alleged that the seller failed to disclose crucial information regarding the business's actual profitability, leading to a significant error in consent. The appellate court annulled the sale, finding that the undisclosed information fundamentally altered the substance of the object of the contract, which constituted a decisive error within the meaning of the relevant civil code provisions. The high court dismissed the appeal, affirming that the intentional concealment of financial data that dramatically misrepresented the business's value constituted a sufficiently substantial error in the underlying contract for its nullification.