6.2.28.7.2 Relative Files
Execution of a Format 2 READ statement sets the file position indicator pointer to the record whose relative record number is contained in the RELATIVE KEY data item, and makes that record available.
If the file does not contain such a record, the INVALID KEY condition exists, and READ statement execution is unsuccessful. (See "Invalid Key Condition" under "Common Processing Facilities" in topic 6.1.8.9.)
The KEY phrase must not be specified for relative files.
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