@startuml
participant REST
participant ACM_Runtime
participant Participants
database ACM_Database

REST -> ACM_Runtime: Undeploy Automation Composition Instance
ACM_Runtime -> ACM_Database: Read Automation Composition Instance Information

alt Automation Composition Instance exists
 alt Automation Composition Instance administrative state is not LOCKED
  ACM_Runtime -> REST: Automation Composition instance exists and is not LOCKED
 else
  ACM_Runtime -> REST: Automation Composition instance does not exist
 end
else
 ACM_Runtime -> Participants: [ASYNC] Undeploy AC Element Instances for this AC Instance
 ACM_Runtime -> ACM_Database: Mark this AC Instance and its AC Element Instances as UNDEPLOYING
 ACM_Runtime -> REST: Undeployment of Automation Composition Instance has been requested
end

@enduml