level-no

       Is the level number of field-name-1. Although not a part of the
       REDEFINES clause, the level number is shown in the format to
       clarify its position relative to the clause.

    field-name-1

       Is the name of the REDEFINES field. You use this name when you
       want to refer to this field. Although not a part of the REDEFINES
       clause, the field name is shown in the format to clarify its
       function and its position relative to the clause.

    field-name-2

       Is the name of the field being redefined.