SQL$HELP72.HLB  —  Errors  COSI_ERRORS, CVTUNGRANT
  cannot convert an ungranted lock

  Explanation:  An attempt was made to convert a lock that is not
  granted.  (Only locks that are granted can be converted to
  another lock mode.)

  User Action:  This error message indicates a possible error in
  the locking protocols.  Contact your Oracle support
  representative for assistance.
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