processes are of course versioned. Everytime you deploy the same projess (after some changes), he gets new version number. This version becomes to active state and previous versions becom "retired". If process is tarted, new instance in active version is created. Standard mechanism is, that instance lives in version, it was started. I dont know standard mechanism to migrate instance to other process definition version. Changes, which was created may be sometimes dangerous for instance, which lives. Custom mechanism may be possible :)
regards darek
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