server/AyaNova/models/AyContext.cs

@@ -143,6 +143,7 @@ namespace AyaNova.Models
             ///////////////////////////////
             //SERIALIZED OBJECTS
             //
+            modelBuilder.Entity<PurchaseOrder>().Property(z => z.Serial).UseIdentityByDefaultColumn();
             modelBuilder.Entity<Widget>().Property(z => z.Serial).UseIdentityByDefaultColumn();
             modelBuilder.Entity<WorkOrder>().Property(z => z.Serial).UseIdentityByDefaultColumn();
             modelBuilder.Entity<Quote>().Property(z => z.Serial).UseIdentityByDefaultColumn();

server/AyaNova/models/PurchaseOrder.cs

@@ -15,7 +15,7 @@ namespace AyaNova.Models
         public long Id { get; set; }
         public uint Concurrency { get; set; }
 
-        [Required]
+       
         public long Serial { get; set; }//WAS PO NUMBER        
         public string Notes { get; set; }
         public string Wiki { get; set; }