Fix to stock movements

prs.classes/Entities/Stock/StockMovement/StockMovement.cs

@@ -146,7 +146,7 @@ namespace Comal.Classes
         /// as <see cref="StockMovement.LinkTransfers(StockMovement, StockMovement, Guid?)"/>.
         /// </summary>
         [NullEditor]
-        public Guid TransferID { get; set; } = Guid.NewGuid();
+        public Guid TransferID { get; set; }
 
         [NullEditor]
         public bool System { get; set; }