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Contracts are concluded so that they have their own effects. However, they may be ineffective due to the concurrence of some cause of nullity. Nullity is imposed as a sanction that the legal system provides to deny, eliminate or deprive contracts and legal acts in general of effect, for having been entered into in violation of the law.
As a consequence of the declaration of nullity of the contract, damages may be generated to the counterparty who has trusted, without fault, in the validity of the contract and who has the legitimate expectation that the legal effects inherent to the contract will occur. Civil liability will arise in order to compensate for damages suffered by the counterparty, regardless of the existence of a contract.