Ordering SQL query by specific field values

Order By Case Edition
    When 'NE' Then 1
    When 'OE' Then 2
    When 'OP' Then 3
    Else 4 End 

SELECT 
  /*other fields*/
  CASE WHEN 'NE' THEN 1
    WHEN "OE" THEN 2
    WHEN "OP" THEN 3
    ELSE 4
END AS OrderBy
FROM
  /*Tables*/
WHERE
  /*conditions*/
ORDER BY
  OrderBy,
  /*other fields*/