The top United Nations envoy to Afghanistan Kai Eide will step down when his two-year mission reaches its scheduled end in March 2010, a UN spokesman said Friday. 'This is not a question of resignation. Kai Eide is sticking to the timetable that he outlined when he took the job in March 2008,' spokesman Dan McNorton told selfnews. 'When Kai Eide started his job he had a two-year horizon as had his predecessors. Kai Eide has asked the United Nations secretary general (Ban Ki- moon) to start the process to identify his successors,' he said. 