@startuml

  Rest -> "ACM Runtime": ACM operation triggered by the user
  activate "ACM Runtime"
  "ACM Runtime" -> "ACM Database": Read Automation Composition information
  activate Participant
  "ACM Runtime" -> Participant : [ASYNC] Send the state change event to the participant
  "ACM Runtime" -> "ACM Database": Mark the AC element into transitioning state
  deactivate  "ACM Runtime"
  Participant -> Participant: Goes OFF_LINE due to an unexpected error
  deactivate Participant

  activate "ACM Runtime"
  "ACM Runtime" -> "ACM Database": Mark OFF_LINE reached for the participant status report
  "ACM Runtime" -> "ACM Database": Mark TIMEOUT reached for the AC instance
  deactivate  "ACM Runtime"


@enduml