Fix: Because of changes in bill loading, there were errors in

reprint/split and other functions where inventories from
     old vouchers was added to new voucher.

Tanshu.Accounts.Repository/VoucherBI.cs

@@ -95,6 +95,8 @@ namespace Tanshu.Accounts.Repository
                     NHibernateUtil.Initialize(item.Product.ProductGroup);
                     foreach (var inmod in item.InventoryModifier)
                         NHibernateUtil.Initialize(inmod.Modifier);
+                    NHibernateUtil.Initialize(item.Vat);
+                    NHibernateUtil.Initialize(item.ServiceTax);
                 }
             }
             foreach (var item in voucher.Settlements)