Unable to handle timed out user transactions without getting an exception

When getting an user transaction timeout, the transaction will be rolled back immediately (in JBoss 4.0.4 it is just marked for roleback). It's not possible to handle the transaction without getting an exception:

• calling 'roleback', 'commit' etc. --> IllegalStateException : The transaction is not active!
• ignoring --> Application error (ERROR [TxInterceptorBMT] Application error: BMT stateless bean TestBean should complete transactions before returning (ejb1.1 spec, 11.6.1), suspended tx=TransactionImple < ac, BasicAction: -53e9f9ab:f44:473af993:31 status: ActionStatus.ABORTED >)