Problems with to_number

HI all,

below is the view i´ve tried to create on a table. The purpose was to do
some math on one of the columns (retning). The column is a double precision
number. The result is that the function is not recognized ("ERROR:  function
to_number(double precision, unknown) does not exist"). I´m a bit uncertain
on how the syntax is, so perhaps someone could point me in the right
direction?

thanks in advance,

Christian

CREATE OR REPLACE VIEW "husnr_view" ("KOMNR", "VEJKODE", "VEJNAVN",
"HUSNUMMER", "POSTNR", "POSTNAVN", "X", "Y", "RETNING", "TSTAND", "NKLASSE")
AS
  SELECT
    HUSNR.KOMNR KOMNR,
    HUSNR.VEJKODE VEJKODE,
    HUSNR.VEJNAVN VEJNAVN,
    HUSNUMMER,
    HUSNR.POSTNR POSTNR,
    HUSNR.POSTNAVN POSTNAVN,
    HUSNR.X X,
    HUSNR.Y Y,
    CASE
      WHEN TO_NUMBER(HUSNR.RETNING, '999g99')<20000
      THEN (20000-TO_NUMBER(HUSNR.RETNING, '999g99'))/111
      WHEN TO_NUMBER(HUSNR.RETNING, '999g99')>20000
      THEN (40000-(TO_NUMBER(HUSNR.RETNING, '999g99')-20000))/111
    END RETNING,
    HUSNR.TSTAND TSTAND,
    HUSNR.NKLASSE NKLASSE

  FROM rk_grundkort.husnr;

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