code: @Override
      public void setCompletedLTCBoundary(Byte completedLTCBoundary) {
          if (tc.isDebugEnabled())
              Tr.debug(tc, "setCompletedLTCBoundary", new Object[] { completedLTCBoundary });
          _completedLTCBoundary = completedLTCBoundary;
      }
docs: /*
  Sets the boundary of the LTC that was completed as a
  result of this Transaction being begun. When this
  transaction completes an LTC with the same boundary
  is placed on the thread.