Two things:

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

Yavsc.Server/Models/Billing/NominativeServiceCommand.cs

@@ -0,0 +1,107 @@
+
+using System;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Yavsc.Models.Billing
+{
+    using Newtonsoft.Json;
+    using Workflow;
+    using Yavsc.Models.Payment;
+    using Yavsc;
+    using Yavsc.Billing;
+    using Yavsc.Abstract.Workflow;
+    using Yavsc.Services;
+
+    public abstract class NominativeServiceCommand : IBaseTrackedEntity, INominativeQuery, IIdentified<long>
+  {
+        public string GetInvoiceId() { return GetType().Name +  "/" + Id;  }
+
+        public abstract long Id { get; set; }
+        public abstract string GetDescription ();
+
+        [Required()]
+        public bool Consent { get; set; }
+        public DateTime DateCreated
+        {
+            get; set;
+        }
+
+        public DateTime DateModified
+        {
+             get; set;
+        }
+
+        public string UserCreated
+        {
+             get; set;
+        }
+
+        public string UserModified
+        {
+             get; set;
+        }
+
+        [DisplayAttribute(Name="Status de la requête")]
+        public QueryStatus Status { get; set; }
+
+    [Required]
+    public string ClientId { get; set; }
+
+    /// <summary>
+    /// The client
+    /// </summary>
+    [ForeignKey("ClientId"),Display(Name="Client")]
+    public ApplicationUser Client { get; set; }
+
+    [Required]
+    public string PerformerId { get; set; }
+    /// <summary>
+    /// The performer identifier
+    /// </summary>
+    [ForeignKey("PerformerId"),Display(Name="Préstataire")]
+    public PerformerProfile PerformerProfile { get; set; }
+
+    public DateTime? ValidationDate {get; set;}
+
+
+    [Display(Name="Montant prévisionel de la préstation")]
+    public decimal? Previsional { get; set; }
+    /// <summary>
+    /// The bill
+    /// </summary>
+    /// <returns></returns>
+
+        [Required]
+        public string ActivityCode { get; set; }
+
+        [ForeignKey("ActivityCode"),JsonIgnore,Display(Name="Domaine d'activité")]
+        public virtual Activity Context  { get; set ; }
+
+        public bool Rejected { get; set; }
+
+        public DateTime RejectedAt { get; set; }
+
+        public abstract System.Collections.Generic.List<IBillItem> GetBillItems();
+
+        public bool GetIsAcquitted()
+        {
+            return Regularisation?.IsOk() ?? false;
+        }
+
+        public string GetFileBaseName(IBillingService billingService)
+        {
+            string type = GetType().Name;
+            string ack = GetIsAcquitted() ? "-ack" : null;
+            var bcode = billingService.BillingMap[type];
+            return $"facture-{bcode}-{Id}{ack}";
+        }
+        
+        [Display(Name = "PaymentId")]
+        public string PaymentId { get; set; }
+
+        [ForeignKey("PaymentId"), Display(Name = "Acquittement de la facture")]
+        public virtual PayPalPayment Regularisation { get; set; }
+
+    }
+}