VMS Help  —  RMU72  RMU_ERRORS, DEADLOCK
  deadlock on <str>

  Explanation:  The operation you attempted has been forbidden  by
  the  database  management  system because it would have led to a
  system deadlock.

  User Action:  Execute a ROLLBACK or a  COMMIT  to  release  your
  locks, and try the transaction again.
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