Change indicators


      MSG   MESSAGE TYPE IDENTIFICATION

      Function: To identify a message type and to give its class and
                maintenance operation.

010   C709  MESSAGE IDENTIFIER                             M  
      1475   Message type identifier                       M  an..6
      1056   Version                                       C  an..9
      1058   Release                                       C  an..9
      1476   Control agency                                C  an..2
      1523   Association assigned identification           C  an..6
      1060   Revision number                               C  an..6
      1373   Document/message status, coded                C  an..3

020   1507  CLASS DESIGNATOR, CODED                        C  an..3

030   4513  MAINTENANCE OPERATION, CODED                   C  an..3

040   C941  RELATIONSHIP                                   C  
      9143   Relationship, coded                           C  an..3
      1131   Code list qualifier                           C  an..3
      3055   Code list responsible agency, coded           C  an..3
      9142   Relationship                                  C  an..35