private void createOrderProcess(
      NewInvoiceDTO newInvoice, InvoiceDTO invoice, BillingProcessDTO process, Integer origin)
      throws SessionInternalError {
    LOG.debug("Generating order process records...");
    // update the orders involved, now that their old data is not needed
    // anymore
    for (int f = 0; f < newInvoice.getOrders().size(); f++) {

      OrderDTO order = (OrderDTO) newInvoice.getOrders().get(f);

      LOG.debug(" ... order " + order.getId());
      // this will help later
      List<PeriodOfTime> periodsList = newInvoice.getPeriods().get(f);
      Date startOfBillingPeriod = (Date) periodsList.get(0).getStart();
      Date endOfBillingPeriod = periodsList.get(periodsList.size() - 1).getEnd();
      Integer periods = (Integer) newInvoice.getPeriods().get(f).size();

      // We don't update orders if this is just a review
      if (newInvoice.getIsReview().intValue() == 0) {
        // update the to_process if applicable
        updateStatusFinished(order, startOfBillingPeriod, endOfBillingPeriod);

        // update this order process field
        updateNextBillableDay(order, endOfBillingPeriod);
      }

      // create the period and update the order-invoice relationship
      try {

        OrderProcessDAS das = new OrderProcessDAS();
        OrderProcessDTO orderProcess = new OrderProcessDTO();
        orderProcess.setPeriodStart(startOfBillingPeriod);
        orderProcess.setPeriodEnd(endOfBillingPeriod);
        orderProcess.setIsReview(newInvoice.getIsReview());
        orderProcess.setPurchaseOrder(order);
        InvoiceDAS invDas = new InvoiceDAS();
        orderProcess.setInvoice(invDas.find(invoice.getId()));
        BillingProcessDAS proDas = new BillingProcessDAS();
        orderProcess.setBillingProcess(process != null ? proDas.find(process.getId()) : null);
        orderProcess.setPeriodsIncluded(periods);
        orderProcess.setOrigin(origin);
        orderProcess = das.save(orderProcess);
        LOG.debug(
            "created order process id " + orderProcess.getId() + " for order " + order.getId());

      } catch (Exception e) {
        throw new SessionInternalError(e);
      }
    }
  }