@startuml
autonumber
box Buyer
participant b as "Ordering"
    
box Seller TMF622
participant po as "ProductOrder"
    
b -> po : POST ProductOrder(category = Change)
po-->b : 201 Created(acknowledged)
note right: TEQ
    
    
po -> b: POST ProductOrderCreateEvent()
    
po -> b: POST ProductOrderStateChangeEvent(accepted)
note right: QEB
    
po -> b: POST ProductOrderAttributeValueChangeEvent()
note right: e.g.: expectedCompletionDate
    
po -> b: POST ProductOrderStateChangeEvent(inProgress)
note right: ABM
    
po -> b: POST ProductOrderStateChangeEvent(completed)
note right: ERLM
    
po -> b: POST ProductOrderAttributeValueChangeEvent()
note right: e.g.: productOrderItem.product.startDate
    
po -> b: POST ProductOrderStateChangeEvent(closed)
note right: ENTM
@enduml