extended value block is not valid

  Explanation:  This warning occurs as the result of a programming
  decision.  The program read the Extended Lock Value Block, but
  the previous writer wrote a Short Lock Value Block.  This
  warning message is returned if the caller has specified the
  XVALBLK flag in the flags argument to the service to request
  locks.  Note that the lock has been successfully granted despite
  the return of this warning message.

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