Observe the following guidelines when you specify HEADER subparameters:
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Separate subparameters with commas, except between c: and another subparameter. Commas are optional for the / subparameter.
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Enclose literals in single quotes.
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Specify blank fields of n bytes as nX.
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For fixed-length records, headings specified with fewer blanks than the logical record length (LRECL) of the output record are automatically padded on the right with blanks.
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If a header length exceeds the logical record length (LRECL) of the output record, MFX will issue the WER116A error message. If you do not wish to shorten the header, you can lengthen the record. For fixed-length output, use the OUTREC control statement or the OUTREC parameter to expand the output record length so that it is at least as long as the longest header (and trailer). For example, if the longest header is 115 characters and the output record length is 80 bytes, use the OUTREC control statement or the OUTREC parameter to insert a blank in position 115 of the output record. This will cause bytes 81 through 115 to be padded with blanks. For variable-length records, it is easiest to just change the LRECL on the output data set DD statement to match the length of the longest header (and trailer).
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HEADERn may not be used with the IFTRAIL parameter.