cobol3.hlp (Topic list)
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Message 0290 (↑ Syntax Messages)
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  Message:      0290
 
  Text:         Index key <key-name> not alphanumeric
 
  Explanation:  You have specified a key item that is not
                alphanumeric, in an index key clause where an alphanumeric
                key item is expected.
 
  Resolution:   Specify an alphanumeric key item.
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