Constant fields are unnamed fields (positions 19 through 28 must be blank), or fields with a special name (*NONE) when POSITION (Position) keyword is used in the record.
Positions 17, 18, and 29 through 44 must be blank if you
specify the POSITION keyword.
You can specify a constant field in a record format that
has a BOX, ENDPAGE, GDF, LINE, OVERLAY, or PAGSEG keyword specified on the
record, only if you have specified a POSITION keyword on the constant field.
When specifying a location (positions 39 through 44) for constant fields, you can specify the fields in any order if you use line numbers. If you do not use line numbers, you must specify the fields in the order in which they are to appear on the printed page.
When you specify the POSITION keyword with a constant field,
the special name *NONE signifies the start of the field in the DDS source.
Therefore, you must specify the POSITION keyword or any other keyword associated
with the constant field, either on the same line as the constant
field keyword or on a subsequent line.
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