@startuml
autonumber
box Buyer of new line
participant b as "Ordering"

box Seller TMF622
participant po as "ProductOrder"
participant cpo as "RescheduleProductOrder"

box Buyer of old line
participant bo as "Ordering"

b -> cpo : POST RescheduleProductOrder
cpo-->b : 201 Created (acknowledged)

cpo -> b: POST RescheduleProductOrderStateChangeEvent (inProgress)
note right: if the request for rescheduling is rejected by the seller,\nthis message is optional (see [[TaskStateType TaskStateType]])

alt Request for rescheduling is rejected
  cpo -> b: POST RescheduleProductOrderStateChangeEvent (rejected)
else Date will be postponed
  po -> b: POST ProductOrderAttributeValueChangeEvent
  note right: e.g.: requestedCompletionDate
  alt ProductOrder in state inProgress
    note over po, b: Insert sequence [[https://confluence.telekom-mms.com/pages/viewpage.action?pageId=495177173 Send new order confirmation]]
  else ProductOrder in state accepted
    po -> b: POST ProductOrderAttributeValueChangeEvent
    note right: e.g.: expectedCompletionDate
  end
  cpo -> b: POST RescheduleProductOrderStateChangeEvent (done)
end
@enduml