There should be warning in the Availability -> JMS Availability screen page title regarding data migration.
This is like the warning in the HA admin guide.
Caution - Before using this procedure to reconfigure an existing cluster, you must follow the special procedures to migrate to another type of broker cluster, as described in To Migrate Between Types of Embedded or Local Conventional Broker Clusters. Failing to perform these special procedures could lead to data loss or corruption and even render your setup unusable, depending on the JMS operations performed on the existing cluster.
We probably want to rephrase it. Please contact Amy for the changes.