RFF  REFERENCE

       Function: To specify a reference.

010    C506 REFERENCE                                  M    1
       1153  Reference code qualifier                  M      an..3
       1154  Reference identifier                      C      an..70
       1156  Document line identifier                  C      an..6
       4000  Reference version identifier              C      an..35
       1060  Revision identifier                       C      an..6