Change indicators UNH MESSAGE HEADER Function: To head, identify and specify a message. 010 0062 MESSAGE REFERENCE NUMBER M an..14 020 S009 MESSAGE IDENTIFIER M 0065 Message type M an..6 0052 Message version number M an..3 0054 Message release number M an..3 0051 Controlling agency M an..2 0057 Association assigned code C an..6 030 0068 COMMON ACCESS REFERENCE C an..35 040 S010 STATUS OF THE TRANSFER C 0070 Sequence of transfers M n..2 0073 First and last transfer C a1