SQL "ORDER BY" and CASE

["ile rpg" <ile_rpg_guy@xxxxxxxxxxx>]

   I'm getting this error ("ORDER BY column *N or expression not in result
   table") in V5R1 using this SQLRPGLE code:
   select cmcust,cmname,cmcity from custmast 
   order by                                
   (case                                   
   when :option = '*NAME' then cmname
   when :option = '*CITY' then cmcity
   end)
    
   The error is indicated at the "(case" statement, with or without
   parentheses.  The column names are valid; OPTION is a valid character
   variable.
    
   Is this construct not supported in iSeries DB2?  Or is my syntax just
   goofy?
    
   Thanks,
   irg

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