Moved numpad control to Tanshu.Common. Billing feature complete. Delete not working as expected

Signed-off-by: unknown <tanshu@.(none)>

Tanshu.Accounts.Contracts/Data Contracts/VoucherBO.cs

@@ -3,6 +3,7 @@ using System.Runtime.Serialization;
 using FluentNHibernate.Mapping;
 using Tanshu.Accounts.Entities.Auth;
 using System.Collections.Generic;
+using Tanshu.Accounts.Contracts;
 
 namespace Tanshu.Accounts.Entities
 {
@@ -17,6 +18,7 @@ namespace Tanshu.Accounts.Entities
         public virtual DateTime CreationDate { get; set; }
         public virtual DateTime LastEditDate { get; set; }
         public virtual char Type { get; set; }
+        [Cascade]
         public virtual IList<Inventory> Inventories { get; set; }
         public Voucher()
         {