Prospects for the institutional reform of investor-State dispute settlement (‘ISDS’) include superimposing an appellate mechanism onto the existing arbitration framework and, in the alternative, replacing that framework with a self-standing international court. While the latter option constitutes a more radical departure from the status quo, the former raises legal questions concerning the modification and potential breach of existing ISDS treaties. In particular, the ISDS model found in recent EU treaty texts (EU-Canada CETA, EU-Vietnam FTA, and draft Transatlantic Trade and Investment Partnership) raises the question of whether ICSID Members may establish an appellate mechanism inter se. This question’s importance extends beyond the EU model, as it concerns the broader feasibility of any appellate mechanism with multilateral aspirations. The authors consider that such modification is permitted by Article 41(1)(b) of the Vienna Convention on the Law of Treaties (‘VCLT’), under which Contracting States may agree to treaty modification inter se if:
the modification in question is not prohibited by the treaty and:
(i) does not affect the enjoyment by the other parties of their rights under the treaty or the performance of their obligations;
(ii) does not relate to a provision, derogation from which is incompatible with the effective execution of the object and purpose of the treaty as a whole.
Whereas the chapeau concerns an express textual prohibition, the respective conditions in sub-clauses (i) and (ii) encompass prohibitions which may be implied in the relationship betwee the modified provision and other aspects of the treaty. The three conditions must be satisfied cumulatively. Read the rest of this entry…