When a conversation was allocated with confirmation allowed (sync_level was set to confirm or syncpt), a sending TP can request confirmation, either on the Send_Data call (with send_type set to Send_and_confirm) or by calling the Confirm service. The partner is notified of the confirmation request by a value returned in the status_received parameter on its next receive call. The partner can then provide the confirmation by calling the Confirmed service, or reject the confirmation by calling the Send_Error service, the Deallocate Type(Abend) service, or (if the conversation is syncpt) with a Backout request.