Answer Posted / nora alexander

It's for Record format field mapping - if you use *NOCHK it
just copies the data without regard to field type or size,
which is a bad idea.
*MAP
Fields with the same name in the from-file and to-file
record formats are copied, and any fields in the to-file
that do not exist in the from-file format are set to the
default value specified on the DFT keyword for the data
description specification (DDS) of the to-file or zero for
numeric fields, blanks for character fields, current
date/time for date/time fields, or null value for null-
capable fields.
If *MAP is specified, *DROP can also be specified. Mapped
fields may have different starting positions in the from-
file and to-file record formats.

If *MAP is specified and a valid conversion is defined
between the from-file field CCSID and the to-file field
CCSID, the character data is converted to the to-file field
CCSID. However, if either the from-file field CCSID or the
to-file field CCSID is 65535, the character data is not
converted.

*MAP allows for the conversion of date/time data and the
copying of null values.

*DROP
This value must be specified for field-level mapping if any
of the field names in the from-file record format do not
exist in the to-file format. If *DROP is specified, *MAP
can also be specified. When *DROP is specified, all the
field names that exist in both record formats must have the
same attributes and relative positions in the from-file and
to-file record formats, or *MAP must also be specified.
Null values are copied.

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