New York, 30/09/2004 (SPS) Polisario Front estimated that the "unacceptable behaviour" of Morocco "constitutes a serious challenge to the very consistency, validity and credibility of the international system represented by the United Nations", read a memorandum by the Saharawi political organisation addressed to the Member States of the United Nations reunited in the 59th Session of the General Assembly. The document notes that for thirty years of its "illegal military occupation" of Western Sahara, "Morocco has not only reneged on its commitments under the settlement plan that "it had accep