Use global temp table for DML error logging

our database is 11.2.0.4 enterprise edition on solaris 10
we are wondering if anyone has an opinion of or has done this before, to use a global temp table for DML error logging. We have a fairly busy transactional database with 2 hot tables for inserts. The regular error table created with dbms_errlog has caused many deadlocks which we don't quite understand yet. we have thought using global temp table for the purpose, and that seemed to work, but we can't read error from the GTT, the table is empty even reading from the same session as inserts. Does anyone have an idea why?
Thanks

The insert into the error logging table is done with a recursive transaction therefore it's private from your session which is doing the actual insert.
Adapted from http://oracle-base.com/articles/10g/dml-error-logging-10gr2.php
INSERT INTO dest
SELECT *
FROM  source
LOG ERRORS INTO err$_dest ('INSERT') REJECT LIMIT UNLIMITED;
99,998 rows inserted.
select count(*) from dest;
  COUNT(*)
    99998
SELECT *
FROM  err$_dest
WHERE  ora_err_tag$ = 'INSERT';
1400    "ORA-01400: cannot insert NULL into ("E668983_DBA"."DEST"."CODE")"        I    INSERT    1000        Description for 1000
1400    "ORA-01400: cannot insert NULL into ("E668983_DBA"."DEST"."CODE")"        I    INSERT    10000        Description for 10000
1400    "ORA-01400: cannot insert NULL into ("E668983_DBA"."DEST"."CODE")"        I    INSERT    1000        Description for 1000
1400    "ORA-01400: cannot insert NULL into ("E668983_DBA"."DEST"."CODE")"        I    INSERT    10000        Description for 10000
rollback;
select count(*) from dest;
  COUNT(*)
        0
SELECT *
FROM  err$_dest
WHERE  ora_err_tag$ = 'INSERT';
1400    "ORA-01400: cannot insert NULL into ("E668983_DBA"."DEST"."CODE")"        I    INSERT    1000        Description for 1000
1400    "ORA-01400: cannot insert NULL into ("E668983_DBA"."DEST"."CODE")"        I    INSERT    10000        Description for 10000
1400    "ORA-01400: cannot insert NULL into ("E668983_DBA"."DEST"."CODE")"        I    INSERT    1000        Description for 1000
1400    "ORA-01400: cannot insert NULL into ("E668983_DBA"."DEST"."CODE")"        I    INSERT    10000        Description for 10000

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