private void createPOSelectItemList() {
   try {
     poSelectItemList.clear();
     ArrayList<PurchaseOrder> openPrList = poController.getOpenPurchaseOrders(warehouseCode);
     poSelectItemList.add(new SelectItem(Long.valueOf(-1), "àÅ×Í¡ãºÊÑ觫×éÍ"));
     SelectItem selectItem;
     for (PurchaseOrder po : openPrList) {
       selectItem = new SelectItem();
       selectItem.setValue(po.getId());
       selectItem.setLabel(po.getFormattedPoNumber());
       poSelectItemList.add(selectItem);
     }
   } catch (ControllerException e) {
     FacesUtils.reportError(FacesContext.getCurrentInstance(), e.getMessage(), e.getMessage(), e);
     e.printStackTrace();
   }
 }