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6.1.8.9.2 Invalid Key Condition
The invalid key condition can occur during execution of a START, READ, WRITE, REWRITE, or DELETE statement. (For details of the causes for the condition, see the appropriate statement in "Part 4. Environment Division" in topic 4.0.) When an invalid key condition occurs, the input-output statement that caused the condition is unsuccessful.
When the invalid key condition is recognized, actions are taken in the following order:
  1. If the FILE STATUS clause is specified in the FILE-CONTROL entry, a value is placed into the status key to indicate an invalid key condition. (See Table 36 in topic 6.1.8.9.1.)
  2. If the INVALID KEY phrase is specified in the statement causing the condition, control is transferred to the INVALID KEY imperative-statement. Any EXCEPTION/ERROR declarative procedure specified for this file is not executed. Execution then continues according to the rules for each statement specified in the imperative-statement.
  3. If the INVALID KEY phrase is not specified in the input-output statement for a file, an EXCEPTION/ERROR procedure must be specified, and that procedure is executed. The NOT INVALID KEY phrase, if specified, is ignored.

X Both the INVALID KEY phrase and the EXCEPTION/ERROR procedure can be
X omitted.
If the invalid key condition does not exist after execution of the input-output operation, the INVALID KEY phrase is ignored, if specified, and the following actions are taken:
  1. If an exception condition which is not an invalid key condition exists, control is transferred according to the rules of the USE statement following the execution of any USE AFTER EXCEPTION procedure.
  2. If no exception condition exists, control is transferred to the end of the input-output statement or the imperative statement specified in the NOT INVALID KEY phrase, if it is specified.

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