Article 166: Disputable and null and void transactions

1. The transaction is invalid on the grounds established by law, by virtue of its recognition by the court (a contested transaction) or independently of such recognition (a nullity transaction). A disputed transaction may be declared invalid by the party to the transaction or by another person referred to in the law; the disputed transaction may be declared invalid if it violates rights or is protected by law. We are the legal interest of the person contesting the transaction, including its adverse effects. If the rights or legally protected interests of such third parties are violated, the party from whose conduct its will to maintain the validity of the transaction is manifest is not entitled to challenge it. 3. The requirement to apply the consequences of an nullity of a nullity transaction is open to the party in question. The requirement to declare an invalid null and void transaction, regardless of the application of the consequences of its invalidity, can be met 4. If the person making the claim has an interest protected by law in declaring the transaction null and void. 5. A declaration of invalidity of a transaction is of no legal value if it refers to n the validity of the transaction is not acting in good faith, in particular if the conduct of the transaction following the transaction has led other persons to rely on the validity of the transaction.