Made DeliveryItem.Documents a NullEditor

prs.classes/Entities/DeliveryItem/DeliveryItem.cs

@@ -129,7 +129,7 @@ namespace Comal.Classes
         public double Volume { get; set; }
 
         [Aggregate(typeof(DeliveryItemDocumentCount))]
-        [IntegerEditor(Editable = Editable.Hidden)]
+        [NullEditor]
         public int Documents { get; set; }
 
         [EnumLookupEditor(typeof(DeliveryItemType))]