code: @Override
    public final <T> List<T> retLstCnd(final Map<String, Object> pRqVs,
      final Class<T> pCls, final String pCond,
        final String[][] pNdFlds) throws Exception {
      throw new Exception("NEI");
    }
docs: <p>Retrieve a list of entities.</p>
  @param <T> - type of business object
  @param pRqVs request scoped vars
  @param pCls entity class
  @param pCond Not NULL e.g. "where name='U1' ORDER BY id"
  @param pNdFlds Not NULL, Map "EntityName"-"needed fields list", e.g.:
  nms - {"iid", "nme"}
  mpNdFl - {{"Uom"}, nms, {"Good"}, nms, {"OrdLn"},
  {"uom", "itm", "iid", "ver", "pric", "quan"}}
  @return list of business objects or empty list, not null
  @throws Exception - an exception