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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