97. Invalidity: lack of competence to conclude treaties.

A state may not invoke the fact that its consent to be bound1 by a treaty2 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 manifest3 and concerned a rule of its internal law of fundamental importance4. 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