新手求指点

CREATE function  s_ConvertYearTermIDToTerm(@YearTermID char(5),@EntryYear char(4))
returns tinyint
as
begin
  declare @Term  tinyint
  if( ISNUMERIC(@YearTermID) and ISNUMERIC(@EntryYear) )
   set  @Term= (Convert(int,@YearTermID)/10-Convert(int,@EntryYear))*2 + Convert(int,@YearTermID)%10
else
   set @Term=0return (@Term)
end
说语法错误，小弟SQL刚入门，实在不明白哪里的问题。跪求大哥指点。