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ARTICLE-2: Use of terms     [go to this ARTICLE]
... 2. The provisions of paragraph 1 regarding the use of terms in the present Convention are without prejudice to the use of those terms or to the meanings which may be given to them in the internal law of any State. ...


ARTICLE-27: Internal law and observance of treaties     [go to this ARTICLE]
... Internal law and observance of treaties ...
... A party may not invoke the provisions of its internal law as justification for its failure to perform a treaty. This rule is without prejudice to article 46. ...


ARTICLE-46: Provisions of internal law regarding competence to conclude treaties     [go to this ARTICLE]
... 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. ...
... 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. ...