How change NLS_NUMERIC_CHARACTERS parameter for load external table

Hi,
I use this version:
OWB 11gR2
Database 11gR2
Parameter NLS_NUMERIC_CHARACTERS Database ., Instance ,.
When I created database with wizard and in this moment I don't set spanish language, later I changed this parameters in instance parameters.
Now I want load data from a file to external table, but I've an error when I try load data with decimal point.
why does it use the database parameter instead of instance parameter?
Is possible to change this parameter?
Cheers
Marisol

At this moment , this is not possible . You can see metalink note ID 268906.1.
It says:
Currently, external tables always use the setting of NLS_NUMERIC_CHARACTERS
+at the database level.+
Cheers
Marisol

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2    (col1 NUMBER,
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5    (TYPE ORACLE_LOADER
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9         BADFILE 'MYDIR':'test_bad.bad'
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order by sdd_table_name;
vv_return_message varchar2(1000);
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vv_err varchar2(2000);
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How change NLS_NUMERIC_CHARACTERS parameter for load external table

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