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  Message:      RT100
 
  Text:         Invalid file operation
 
  Severity:     Fatal
 
  Explanation:  You have attempted a file operation which violates a
                general rule of COBOL in some way.  The most likely
                cause of this error is that you have attempted a
                rewrite on a sequential file opened I-O, or on a
                relative file with access mode sequential also opened
                I-O, without preceding it with a successful read NEXT.
 
 
  Resolution:   Recode your program to ensure that the REwrite
                statement in error is preceded by a read NEXT.
                                    -♦-