When a TP encounters an error or cannot grant a confirmation, the TP can send an error notification to its partner, from either Send or Receive state. For example, if TP A is sending records to TP B and then deleting them, TP B should notify A if an internal error prevents B from filing a record. Otherwise, TP A might delete the record and lose it forever. To notify partners and recover from such errors, TPs use the Send_Error service.