The concept of « amendment » refers to the modification of certain provisions of the treaty only between certain contracting parties, while for the other contracting parties, the original provisions of the treaty remain applicable. If the treaty amendments are changed, they are only admissible if the amendments do not affect the rights or obligations of the other contracting parties and do not contrane the purpose and purpose of the treaty. There are three ways to change an existing treaty. First, a formal change requires that States Parties be forced to go through the ratification process again. The renegotiation of the treaty provisions can be long and time-consuming and often some parties to the original treaty will not become parties to the amended treaty. In determining the legal obligations of states, a party to the original treaty and a party to the amended treaty, states are bound only by the conditions on which they have agreed. Contracts may also be amended informally by the treaty office if the amendments are procedural in nature, and technical changes in customary international law may also alter a contract in which the state`s conduct presents a reinterpreting interpretation of legal obligations arising from the treaty. Minor corrections to a contract may be accepted by a minutes; However, a minutes are generally reserved for amendments to correct obvious errors in the adopted text, i.e. where the adopted text does not adequately reflect the parties` intention to adopt it. Contracts sometimes contain self-fulfilling provisions, which means that the contract is automatically terminated if certain defined conditions are met. Some contracts should only be binding temporarily by the parties and will expire at some point. Other contracts may be terminated themselves if the contract is to be concluded only under certain conditions.  When a state limits its contractual obligations by reservations, other contracting states have the opportunity to accept, oppose or oppose these reservations.
If the state accepts (or does not act at all), both the reserve state and the accepting state are exempt from the legal obligation reserved with respect to their legal obligations with each other (the acceptance of the reservation does not alter the legal obligations of the accepting state with respect to the other contracting parties). If the state objects, the parts of the contract concerned by the booking are completely cancelled and no longer create legal obligations for the reserve and acceptance of the state, again only with regard to the other. Finally, if the state opposes and opposes it, there are no legal obligations arising from this treaty between these two states. The resisting and reticating state essentially refuses to recognize the reserving state, is even a party to the treaty.  International agreements that enter into force on a different constitutional basis from that of the Senate and Senate approval are « non-treaty international agreements » and are often referred to as « executive agreements. » Congress generally requires notification when such an agreement is reached. Where a party has substantially breached or breached its contractual obligations, the other parties may invoke that breach as grounds for a temporary suspension of its obligations to that party under the contract.