code: public void clearTransition (Class<?> clazz, final String name)
          throws PersistenceException
      {
          final String cname = clazz.getName();
          executeUpdate(new Operation<Void>() {
              public Void invoke (Connection conn, DatabaseLiaison liaison)
                  throws SQLException, PersistenceException
              {
                  PreparedStatement stmt = null;
                  try {
                      stmt = conn.prepareStatement(
                          " delete from " + liaison.tableSQL("TRANSITIONS") +
                          "       where " + liaison.columnSQL("CLASS") + "=? " +
                          "         and " + liaison.columnSQL("NAME") + "=?");
                      stmt.setString(1, cname);
                      stmt.setString(2, name);
                      stmt.executeUpdate(); // we don't care if it worked or not
  
                  } finally {
                      JDBCUtil.close(stmt);
                  }
                  return null;
              }
          });
      }
docs: Clear the transition.