Either party may request annulment of the award by an application in writing addressed to the Secretary-General on one or more of the following grounds:
(a) that the Tribunal was not properly constituted;
(b) that the Tribunal has manifestly exceeded its powers;
(c) that there was corruption on the part of a member of
the Tribunal;
(d) that there has been a serious departure from a fundamental
rule of procedure; or
(e) that the award has failed to state the reasons on which it
is based.