VMS Help  —  RMU72  COSI_ERRORS, FLK
  file currently locked by another user

  Explanation:  An attempt  to  open  or  create  a  file  failed.
  Another  user  has the file open in a mode incompatible with the
  attempted access.

  User Action:  Wait until the other user has unlocked  the  file.
  If  the  file cannot be shared, modify the program to detect and
  respond to this condition by waiting.
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