cobol3.hlp (Topic list)
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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
Message 0231 (↑ Syntax Messages)
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  Message:      0231
 
  Text:         INDEXED data-name missing or already declared
                                    -♦-