Change indicators


      BGM   BEGINNING OF MESSAGE

      Function: To indicate the type and function of a message and to
                transmit the identifying number.

010   C002  DOCUMENT/MESSAGE NAME                          C  
      1001   Document/message name, coded                  C  an..3
      1131   Code list qualifier                           C  an..3
      3055   Code list responsible agency, coded           C  an..3
      1000   Document/message name                         C  an..35

020   C106  DOCUMENT/MESSAGE IDENTIFICATION                C  
      1004   Document/message number                       C  an..35
      1056   Version                                       C  an..9
      1060   Revision number                               C  an..6

030   1225  MESSAGE FUNCTION, CODED                        C  an..3

040   4343  RESPONSE TYPE, CODED                           C  an..3