cobol3.hlp (Topic list)
Message 0050 (↑ Syntax Messages)
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  Message:      0050
 
  Text:         Illegal use of Pointer Data-item, ADDRESS OF or NULL
 
  Explanation:  You have tried to perform an illegal operation on a
                data item with USAGE POINTER. Alternatively, you have tried
                to apply the ADDRESS OF phrase to an item that is not an 01
                or 77 level item in the Working-Storage or Linkage Section.
 
  Resolution:   Check your Language Reference for details of
                the operations you can perform on pointer items.
                                    -♦-