public final Response executeCommand(
      Object inputPar,
      UserSessionParameters userSessionPars,
      HttpServletRequest request,
      HttpServletResponse response,
      HttpSession userSession,
      ServletContext context) {
    try {
      DetailSaleDocRowVO rowVO = (DetailSaleDocRowVO) inputPar;
      VariantDescriptionsVO vo =
          (VariantDescriptionsVO)
              ((JAIOUserSessionParameters) userSessionPars)
                  .getVariantDescriptionsVO()
                  .get(rowVO.getCompanyCodeSys01DOC02());
      InsertSaleItem bean =
          (InsertSaleItem) JAIOBeanFactory.getInstance().getBean(InsertSaleItem.class);
      Response answer =
          bean.insertSaleItem(
              vo.getVariant1Descriptions(),
              vo.getVariant2Descriptions(),
              vo.getVariant3Descriptions(),
              vo.getVariant4Descriptions(),
              vo.getVariant5Descriptions(),
              rowVO,
              ((JAIOUserSessionParameters) userSessionPars).getServerLanguageId(),
              userSessionPars.getUsername());

      return answer;
    } catch (Throwable ex) {
      Logger.error(
          userSessionPars.getUsername(),
          this.getClass().getName(),
          "executeCommand",
          "Error while processing request",
          ex);
      return new ErrorResponse(ex.getMessage());
    }
  }
  /** Business logic to execute. */
  public final Response executeCommand(
      Object inputPar,
      UserSessionParameters userSessionPars,
      HttpServletRequest request,
      HttpServletResponse response,
      HttpSession userSession,
      ServletContext context) {
    String serverLanguageId = ((JAIOUserSessionParameters) userSessionPars).getServerLanguageId();
    Connection conn = null;
    PreparedStatement pstmt = null;
    try {
      conn = ConnectionManager.getConnection(context);

      // fires the GenericEvent.CONNECTION_CREATED event...
      EventsManager.getInstance()
          .processEvent(
              new GenericEvent(
                  this,
                  getRequestName(),
                  GenericEvent.CONNECTION_CREATED,
                  (JAIOUserSessionParameters) userSessionPars,
                  request,
                  response,
                  userSession,
                  context,
                  conn,
                  inputPar,
                  null));
      DetailSaleDocVO docVO = (DetailSaleDocVO) inputPar;

      // retrieve internationalization settings (Resources object)...
      ServerResourcesFactory factory =
          (ServerResourcesFactory) context.getAttribute(Controller.RESOURCES_FACTORY);
      Resources resources = factory.getResources(userSessionPars.getLanguageId());

      // insert header...
      docVO.setDocStateDOC01(ApplicationConsts.HEADER_BLOCKED);
      Response res =
          insDocBean.insertSaleDoc(
              conn, docVO, userSessionPars, request, response, userSession, context);
      if (res.isError()) {
        conn.rollback();
        return res;
      }

      SaleDocPK refPK =
          new SaleDocPK(
              docVO.getCompanyCodeSys01Doc01DOC01(),
              docVO.getDocTypeDoc01DOC01(),
              docVO.getDocYearDoc01DOC01(),
              docVO.getDocNumberDoc01DOC01());

      // retrieve ref. document item rows...
      GridParams gridParams = new GridParams();
      gridParams.getOtherGridParams().put(ApplicationConsts.SALE_DOC_PK, refPK);
      res =
          rowsAction.executeCommand(
              gridParams, userSessionPars, request, response, userSession, context);
      if (res.isError()) {
        conn.rollback();
        return res;
      }
      java.util.List rows = ((VOListResponse) res).getRows();

      // create rows..
      GridSaleDocRowVO gridRowVO = null;
      DetailSaleDocRowVO rowVO = null;
      java.util.List discRows = null;
      SaleDocRowPK docRowPK = null;
      SaleItemDiscountVO itemDiscVO = null;
      gridParams = new GridParams();
      for (int i = 0; i < rows.size(); i++) {
        gridRowVO = (GridSaleDocRowVO) rows.get(i);

        // retrieve row detail...
        docRowPK =
            new SaleDocRowPK(
                gridRowVO.getCompanyCodeSys01DOC02(),
                gridRowVO.getDocTypeDOC02(),
                gridRowVO.getDocYearDOC02(),
                gridRowVO.getDocNumberDOC02(),
                gridRowVO.getItemCodeItm01DOC02(),
                gridRowVO.getVariantTypeItm06DOC02(),
                gridRowVO.getVariantCodeItm11DOC02(),
                gridRowVO.getVariantTypeItm07DOC02(),
                gridRowVO.getVariantCodeItm12DOC02(),
                gridRowVO.getVariantTypeItm08DOC02(),
                gridRowVO.getVariantCodeItm13DOC02(),
                gridRowVO.getVariantTypeItm09DOC02(),
                gridRowVO.getVariantCodeItm14DOC02(),
                gridRowVO.getVariantTypeItm10DOC02(),
                gridRowVO.getVariantCodeItm15DOC02());

        res =
            rowAction.executeCommand(
                docRowPK, userSessionPars, request, response, userSession, context);
        if (res.isError()) {
          conn.rollback();
          return res;
        }
        rowVO = (DetailSaleDocRowVO) ((VOResponse) res).getVo();
        rowVO.setDocTypeDOC02(docVO.getDocTypeDOC01());
        rowVO.setDocNumberDOC02(docVO.getDocNumberDOC01());
        if (rowVO.getInvoiceQtyDOC02().doubleValue() < rowVO.getQtyDOC02().doubleValue()
            && rowVO.getQtyDOC02().doubleValue() == rowVO.getOutQtyDOC02().doubleValue()) {
          rowVO.setQtyDOC02(
              rowVO
                  .getQtyDOC02()
                  .subtract(
                      rowVO
                          .getInvoiceQtyDOC02()
                          .setScale(
                              rowVO.getDecimalsReg02DOC02().intValue(), BigDecimal.ROUND_HALF_UP)));
          rowVO.setTaxableIncomeDOC02(
              rowVO
                  .getQtyDOC02()
                  .multiply(rowVO.getValueSal02DOC02())
                  .setScale(docVO.getDecimalsREG03().intValue(), BigDecimal.ROUND_HALF_UP));
          rowVO.setTotalDiscountDOC02(new BigDecimal(0));

          // calculate row vat...
          double vatPerc =
              rowVO.getValueReg01DOC02().doubleValue()
                  * (1d - rowVO.getDeductibleReg01DOC02().doubleValue() / 100d)
                  / 100;
          rowVO.setVatValueDOC02(
              rowVO
                  .getTaxableIncomeDOC02()
                  .multiply(new BigDecimal(vatPerc))
                  .setScale(docVO.getDecimalsREG03().intValue(), BigDecimal.ROUND_HALF_UP));

          // calculate row total...
          rowVO.setValueDOC02(rowVO.getTaxableIncomeDOC02().add(rowVO.getVatValueDOC02()));

          res =
              insRowBean.insertSaleItem(
                  conn, rowVO, userSessionPars, request, response, userSession, context);
          if (res.isError()) {
            conn.rollback();
            return res;
          }

          // create item discounts...
          gridParams.getOtherGridParams().put(ApplicationConsts.SALE_DOC_ROW_PK, docRowPK);
          res =
              itemDiscAction.executeCommand(
                  gridParams, userSessionPars, request, response, userSession, context);
          if (res.isError()) {
            conn.rollback();
            return res;
          }
          discRows = ((VOListResponse) res).getRows();
          for (int j = 0; j < discRows.size(); j++) {
            itemDiscVO = (SaleItemDiscountVO) discRows.get(j);
            itemDiscVO.setDocTypeDOC04(docVO.getDocTypeDOC01());
            itemDiscVO.setDocNumberDOC04(docVO.getDocNumberDOC01());
            res =
                insItemDiscBean.insertSaleDocRowDiscount(
                    conn, itemDiscVO, userSessionPars, request, response, userSession, context);
            if (res.isError()) {
              conn.rollback();
              return res;
            }
          }
        }
      }

      // create charges...
      gridParams = new GridParams();
      gridParams.getOtherGridParams().put(ApplicationConsts.SALE_DOC_PK, refPK);
      res =
          chargesAction.executeCommand(
              gridParams, userSessionPars, request, response, userSession, context);
      SaleDocChargeVO chargeVO = null;
      if (res.isError()) {
        conn.rollback();
        return res;
      }
      rows = ((VOListResponse) res).getRows();
      for (int i = 0; i < rows.size(); i++) {
        chargeVO = (SaleDocChargeVO) rows.get(i);
        chargeVO.setDocTypeDOC03(docVO.getDocTypeDOC01());
        chargeVO.setDocNumberDOC03(docVO.getDocNumberDOC01());
        if (chargeVO.getValueDOC03() == null
            || chargeVO.getValueDOC03() != null
                && chargeVO.getInvoicedValueDOC03().doubleValue()
                    < chargeVO.getValueDOC03().doubleValue()) {
          if (chargeVO.getValueDOC03() != null)
            chargeVO.setValueDOC03(
                chargeVO
                    .getValueDOC03()
                    .subtract(chargeVO.getInvoicedValueDOC03())
                    .setScale(docVO.getDecimalsREG03().intValue(), BigDecimal.ROUND_HALF_UP));

          res =
              insChargeBean.insertSaleDocCharge(
                  conn, chargeVO, userSessionPars, request, response, userSession, context);
          if (res.isError()) {
            conn.rollback();
            return res;
          }
        }
      }

      // create activities...
      res =
          actAction.executeCommand(
              gridParams, userSessionPars, request, response, userSession, context);
      if (res.isError()) {
        conn.rollback();
        return res;
      }
      SaleDocActivityVO actVO = null;
      rows = ((VOListResponse) res).getRows();
      for (int i = 0; i < rows.size(); i++) {
        actVO = (SaleDocActivityVO) rows.get(i);
        actVO.setDocTypeDOC13(docVO.getDocTypeDOC01());
        actVO.setDocNumberDOC13(docVO.getDocNumberDOC01());
        if (actVO.getInvoicedValueDOC13().doubleValue() < actVO.getValueDOC13().doubleValue()) {
          actVO.setValueDOC13(
              actVO
                  .getValueDOC13()
                  .subtract(actVO.getInvoicedValueDOC13())
                  .setScale(docVO.getDecimalsREG03().intValue(), BigDecimal.ROUND_HALF_UP));
          res =
              insActBean.insertSaleActivity(
                  conn, actVO, userSessionPars, request, response, userSession, context);
          if (res.isError()) {
            conn.rollback();
            return res;
          }
        }
      }

      // create header discounts...
      res =
          discAction.executeCommand(
              gridParams, userSessionPars, request, response, userSession, context);
      if (res.isError()) {
        conn.rollback();
        return res;
      }
      SaleDocDiscountVO discVO = null;
      rows = ((VOListResponse) res).getRows();
      for (int i = 0; i < rows.size(); i++) {
        discVO = (SaleDocDiscountVO) rows.get(i);
        discVO.setDocTypeDOC05(docVO.getDocTypeDOC01());
        discVO.setDocNumberDOC05(docVO.getDocNumberDOC01());
        res =
            insDiscBean.insertSaleDocDiscount(
                conn, discVO, userSessionPars, request, response, userSession, context);
        if (res.isError()) {
          conn.rollback();
          return res;
        }
      }

      // recalculate all taxable incomes, vats, totals...
      SaleDocPK pk =
          new SaleDocPK(
              docVO.getCompanyCodeSys01DOC01(),
              docVO.getDocTypeDOC01(),
              docVO.getDocYearDOC01(),
              docVO.getDocNumberDOC01());
      res =
          totals.updateTaxableIncomes(
              conn, pk, userSessionPars, request, response, userSession, context);
      if (res.isError()) {
        conn.rollback();
        return res;
      }

      // reload doc header with updated totals...
      Response answer =
          docAction.loadSaleDoc(conn, pk, userSessionPars, request, response, userSession, context);

      // fires the GenericEvent.BEFORE_COMMIT event...
      EventsManager.getInstance()
          .processEvent(
              new GenericEvent(
                  this,
                  getRequestName(),
                  GenericEvent.BEFORE_COMMIT,
                  (JAIOUserSessionParameters) userSessionPars,
                  request,
                  response,
                  userSession,
                  context,
                  conn,
                  inputPar,
                  answer));

      conn.commit();

      // fires the GenericEvent.AFTER_COMMIT event...
      EventsManager.getInstance()
          .processEvent(
              new GenericEvent(
                  this,
                  getRequestName(),
                  GenericEvent.AFTER_COMMIT,
                  (JAIOUserSessionParameters) userSessionPars,
                  request,
                  response,
                  userSession,
                  context,
                  conn,
                  inputPar,
                  answer));

      return answer;
    } catch (Throwable ex) {
      Logger.error(
          userSessionPars.getUsername(),
          this.getClass().getName(),
          "executeCommand",
          "Error while creating a sale invoice from a sale document",
          ex);
      try {
        conn.rollback();
      } catch (Exception ex3) {
      }
      return new ErrorResponse(ex.getMessage());
    } finally {
      try {
        pstmt.close();
      } catch (Exception ex2) {
      }

      try {
        ConnectionManager.releaseConnection(conn, context);
      } catch (Exception ex1) {
      }
    }
  }