The KahaDB Store version setting is used to control which OpenWire marshaller is used to serialize the openwire command objects in the Journal. When dealing with AMQP connections specifically it is best to start with a clean KahaDB store and set the version to 10 right now (default is 6) so that the Messages in the store properly save off the AMQP specific message Ids.

If the broker is running with the old store version and using the JMS transformer for protocol interop the original message Id value can be lost leading to problems on the client side, or on the broker side if trying to match a message selector etc.