6.2.31.7 Relative Files
The number of character positions in record-name-1 must equal the number of character positions in the record being replaced.
X The number of character positions in record-name-1 can be different from
X the number of character positions in the record being replaced.
For relative files in sequential access mode, the INVALID KEY phrase must not be specified. An EXCEPTION/ERROR procedure can be specified.
The INVALID KEY phrase must be specified in the REWRITE statement for relative files in the random or dynamic access mode, and for which an appropriate USE AFTER STANDARD EXCEPTION procedure is not specified.
X The INVALID KEY phrase does not have to be specified if an appropriate USE
X AFTER STANDARD EXCEPTION procedure is not specified.
When the access mode is random or dynamic, the record to be replaced is specified in the RELATIVE KEY data item. If the file does not contain the record specified, an invalid key condition exists, and, if specified, the INVALID KEY imperative-statement is executed. (See "Invalid Key Condition" under "Common Processing Facilities" in topic 6.1.8.9.) The updating operation does not take place, and the data in record-name is unaffected.
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