6.2.31.5 Sequential Files
For files in the sequential access mode, the last prior input/output statement executed for this file must be a successfully executed READ statement. When the REWRITE statement is executed, the record retrieved by that READ statement is logically replaced.
The number of character positions in record-name-1 must equal the number of character positions in the record being replaced.
The INVALID KEY phrase must not be specified for a file with sequential organization. An EXCEPTION/ERROR procedure can be specified.
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