docs: public final void emptyCart(final Map<String, Object> pRqVs,
      final Cart pCart) throws Exception {
      String[] fieldsNames = new String[] {"itsId", "itsVersion", "disab"};
      pRqVs.put("fieldsNames", fieldsNames);
      for (CartLn l : pCart.getItems()) {
        if (!l.getDisab()) {
          l.setDisab(true);
          getSrvOrm().updateEntity(pRqVs, l);
        }
      }
      for (CartTxLn l : pCart.getTaxes()) {
        if (!l.getDisab()) {
          l.setDisab(true);
          getSrvOrm().updateEntity(pRqVs, l);
        }
      }
      for (CartTot l : pCart.getTotals()) {
        if (!l.getDisab()) {
          l.setDisab(true);
          getSrvOrm().updateEntity(pRqVs, l);
        }
      }
      pRqVs.remove("fieldsNames");
      if (pCart.getTot().compareTo(BigDecimal.ZERO) == 1) {
        pCart.setTot(BigDecimal.ZERO);
        getSrvOrm().updateEntity(pRqVs, pCart);
      }
    }