2. An international organization 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 the conduct of the competent organ be considered as having renounced the right to invoke that ground.
SECTION 2. INVALIDITY OF TREATIES
Article 46
Provisions of internal law of a State and rules of
an international organization 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. An international organization may not invoke the fact that its consent to be bound by a treaty has been expressed in violation of the rules of the organization regarding competence to conclude treaties as invalidating its consent unless that violation was manifest and concerned a rule of fundamental importance.
3. A violation is manifest if it would be objectively evident to any State or any international organization conducting itself in the matter in accordance with the normal practice of States and, where appropriate, of international organizations and in good faith.
Article 47
Specific restrictions on authority to express the consent
of a State or an international organization
If the authority of a representative to express the consent of a State or of an international organization 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 negotiating States and negotiating organizations prior to his
expressing such consent.
Article 48
Error
1. A State or an international organization 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
