We could not reproduce the problem. Please send to odac*crlab*com a complete small sample that demonstrates the problem, including script to create database objects.
The error occurs with source code provided with odac demo samples in 6.25. The database is Oracle 9i 9.2.0.4. In Oracle 10g XE works fine. I'll patch the database again wiht 9.2.0.4 patch utility .... Thanks.