An optional business id used to enforce uniqueness of the process instance that a
message start event would create. If provided and uniqueness enforcement is enabled,
the engine rejects starting a new process instance when another root process instance
with the same business id is already active for the same process definition. It has no
effect when the message correlates to a catch, boundary, or intermediate event.
An optional business id used to enforce uniqueness of the process instance that a message start event would create. If provided and uniqueness enforcement is enabled, the engine rejects starting a new process instance when another root process instance with the same business id is already active for the same process definition. It has no effect when the message correlates to a catch, boundary, or intermediate event.