TTR-Qpid-03-TX logs 'Got unexpected message with correlationId: xx'

When running through the perftest package of tests (Using perftests/bin/RunCore.sh) there was a warning logged:
Dispatcher-Channel-1 2010-01-25 14:42:54,218 WARN [apache.qpid.requestreply.PingPongProducer] Got unexpected message with correlationId: 52

This came from the TTR-Qpid-03-TX test.

The cause of this failure is that messages from a previous test cycle have been left behind and are unknown to the current cycle.

This is logged as a warning and does not constitute a failure of the test. IIRC this check was added to ensure that data not generated by this test did not interfere with the current test run.

However, this warning is not normally seen and has only started occuring consistently recently. Investigation into the exact cause and why it is only this test that shows the warnings would be helpful.