5. In cases falling under articles 51, 52 and 53, no separation of the provisions of the treaty is permitted.
Article 45. Loss of a right to invoke a ground for invalidating, terminating, withdrawing from or suspending the operation of a treaty
A State may no longer invoke a ground for invalidating, terminating, withdrawing from or suspending the operation of a treaty under articles 46 to 50 or articles 60 and 62 if, after becoming aware of the facts:
- (a) it shall have expressly agreed that the treaty is valid or remains in force or continues in operation, as the case may be; or
- (b) it must by reason of its conduct be considered as having acquiesced in the validity of the treaty or in its maintenance in force or in operation, as the case may be.
SECTION 2. INVALIDITY OF TREATIES
Article 46. Provisions of internal law regarding competence to conclude treaties
1. A State may not invoke the fact that its consent to be bound by a treaty has been expressed in violation of a provision of its internal law regarding competence to conclude treaties as invalidating its consent unless that violation was manifest and concerned a rule of its internal law of fundamental importance.
2. A violation is manifest if it would be objectively evident to any State conducting itself in the matter in accordance with normal practice and in good faith.
Article 47. Specific restrictions on authority to express the consent of a State
If the authority of a representative to express the consent of a State to be bound by a particular treaty has been made subject to a specific restriction, his omission to observe that restriction may not be invoked as invalidating the consent expressed by him unless the restriction was notified to the other negotiating States prior to his expressing such consent.
Article 48. Error
1. A State may invoke an error in a treaty as invalidating its consent to be bound by the treaty if the error relates to a fact or situation which was assumed by that State to exist at the time when the treaty was concluded and formed an essential basis of its consent to be bound by the treaty.
