- a stage (s) contains two human tasks (h1 and h2)
- s, h1 and h2 are active
- Thread t1 completes h1
- Thread t2 completes h2
--> Stage s is still active (but should be completed)
The revision of the parent stage should be incremented, whenever a child has been completed, terminated or disabled. This will lead to OptimisticLockingException, if child case executions will be completed (or terminated or disabled) concurrently.