Set NLS_NUMERIC_CHARACTERS

Question

Hello,
I have the following problem, please help me:
I have a procedure that can be run without any kind of problems on SQL*Plus 8.0.6.0 ( Oracle 9.2.0.8.0 (9i) ), regardless of how
NLS_NUMERIC_CHARACTERS is set in registry ( this being the purpose of my procedure).
In Report Builder 6.0.8.11.3 I get the following error "numeric or value error' , no matter how W variable is displayed (containing dot or comma as decimal separator)
I have to say that on compilation I get no errors.
declare
w varchar2(10) := '0,888' ;
nx number := 0;
begin
if instr(w, ',' ) > 0 then
nx := TO_NUMBER(w, '0D000', ' NLS_NUMERIC_CHARACTERS = ,.' ) ;
dbms_output.put_line('comma nx = '|| nx) ;
end if ;
if instr(w, '.' ) > 0 then
nx := TO_NUMBER(w, '0D000', ' NLS_NUMERIC_CHARACTERS = .,' ) ;
dbms_output.put_line('dot nx = '|| nx) ;
end if ;
end;
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Answer 1

I do an execute immediate but it doesn't work. Is it something like that?
EXECUTE IMMEDIATE ('alter session set nls_numeric_characters=",."')