What is the correct syntax for hexadecimal notation.

I can create following function

CREATE FUNCTION "PMX_FN_TEST" (

    p_in INTEGER

)

RETURNS p_out INTEGER

LANGUAGE SQLSCRIPT AS

BEGIN

    p_out := 0xA001 + p_in;

END;

but calling it as follows:

SELECT "PMX_FN_TEST"( 5 ) FROM dummy;

results in error:

Could not execute 'SELECT "PMX_FN_TEST"( 5 ) FROM dummy' in 45 ms 16 µs .

SAP DBTech JDBC: [478]: user defined function runtime error: Llang Runtime Error: FatalException::Unregistered[130] (range 2): 'A001'

  at main (line 12) (TEST.PMX_FN_TEST: line 7 col 2 (at pos 99))

at user-defined function 

What is wrong here?

I do not get a syntax error on the 0xA001 when creating the function.