In another Advisory Opinion issued in 1955, the Court further ruled that the General Assembly was not required to follow League of Nations voting procedures in determining questions concerning South West Africa. In 1956, the Court further ruled that the Committee had the power to grant hearings to petitioners from the mandated territory. In 1960, Ethiopia and Liberia filed a case in the International Court of Justice against South Africa alleging that South Africa had not fulfilled its mandatory duties. This case did not succeed, with the Court ruling in 1966 that they were not the proper parties to bring the case.