1. A party to negotiations or a contract who has knowledge of information that is of decisive importance to the consent of the other party shall inform them of it whenever the other party's ignorance of the information is presumed or they have placed their trust in the other contracting party. Information that has a direct and necessary connection to the content of the contract or the status of the parties shall be considered essential and decisive information for the consent of the parties. 2. Disclosure of essential and decisive information is an obligation that falls on both parties to the negotiations or contract, under which each party is obliged to exercise due care to provide the other party with the information and data related to the negotiations or the contract intended to be concluded, and the practical circumstances and facts of the contractual process. 3. The party claiming that information that should have been disclosed to them was concealed shall prove it, and it is incumbent on the other party to prove that they informed them of it. 4. The parties may not agree to limit the obligation of disclosure of essential and decisive information, or to be exempted from it or exclude it. Any condition providing otherwise shall be void, and the aggrieved party may request the annulment of the contract as a result of the other party's breach of this obligation.
Interpretation and application must be checked against the official text and current version.