Hi
I have a problem with UDF, I want to use ABS in a wiew.
Declaration of external function ABS is following

DECLARE EXTERNAL FUNCTION ABS
DOUBLE PRECISION
RETURNS DOUBLE PRECISION BY VALUE
ENTRY_POINT 'IB_UDF_abs' MODULE_NAME 'fbudf.dll'

the declaration of wiew is following
CREATE VIEW AVG_YAKIN
(
HISSE,
YAKIN
) AS
SELECT HISSE,C_AVG_PD FROM DATA WHERE ABS(C_AVG_PD)>0 ;


but I could not create view it gives an error "ABS is not defined, module
name or etrypoint could not be found
I am using latest version of Firebird
thanks