Two things:

* User views its devices, from a /manage index link
* Yavsc.Server resurection

Yavsc.Abstract/:w

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using Yavsc.Services;
+
+namespace Yavsc.Billing
+{
+    public interface IBillable {
+        string GetDescription ();
+        List<IBillItem> GetBillItems();
+        long Id { get; set; }
+
+        string ActivityCode { get; set; }
+
+        string PerformerId { get; set; }
+        string ClientId { get; set; }
+        /// <summary>
+        /// Date de validation de la demande par le client
+        /// </summary>
+        /// <returns></returns>
+
+        DateTime? ValidationDate { get; }
+
+        bool GetIsAcquitted ();
+
+        string GetFileBaseName (IBillingService service);
+
+    }
+}