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 M an..9 1058 Release M an..9 1476 Control agency M 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