cobol3.hlp (Topic list)
Message 0257 (↑ Syntax Messages)
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  Message:      0257
 
  Text:         KEY data-name missing or already declared
 
  Explanation:  You have either not declared a data item specified in
                the KEY phrase of an OCCURS clause, or you have declared it
                twice.
 
  Resolution:   Declare the data item or remove the extra declaration.
                                    -♦-