SECTION 30. All differences arising out of the interpretation or application of the present convention shall be referred to the International Court of Justice, unless in any case it is agreed by the parties to have recourse to another mode of settlement. If a difference arises between the United Nations on the one hand and a Member on the other hand, a request shall be made for an advisory opinion on any legal question involved in accordance with Article 96 of the Charter and Article 65 of the Statute of the Court. The opinion given by the Court shall be accepted as decisive by the parties.