Hi, I recently started a transition to a new type and my instructor was told by the airport authority to set "X-ray" into field #8 "type of flight" (and add "RMK/SCHOOL FLIGHT" into #18) of the ICAO flight plan. I was unable to set "X" as the Type of flight, as SD only allows to set VFR/IFR/Mixed.Any help greatly appreciated - thanks!