1 files changed, 7 insertions, 7 deletions
diff --git a/Software/Visual_Studio/Tango.BL/Entities/SysdiagramBase.cs b/Software/Visual_Studio/Tango.BL/Entities/SysdiagramBase.cs
index 5480d47f1..2e99df9b0 100644
--- a/Software/Visual_Studio/Tango.BL/Entities/SysdiagramBase.cs
+++ b/Software/Visual_Studio/Tango.BL/Entities/SysdiagramBase.cs
@@ -19,7 +19,6 @@ using System.Linq;
 using Tango.DAL.Remote.DB;
 using Tango.Core;
 using System.ComponentModel;
-using Tango.Core.CustomAttributes;
 
 namespace Tango.BL.Entities
 {
@@ -27,19 +26,17 @@ namespace Tango.BL.Entities
     public abstract class SysdiagramBase : ObservableEntity<Sysdiagram>
     {
 
-        public event EventHandler<Nullable<Int32>> VersionChanged;
+        public event EventHandler<SynchronizedObservableCollection<Int32>> VersionChanged;
 
         public event EventHandler<Byte[]> DefinitionChanged;
 
-        protected Nullable<Int32> _version;
+        protected SynchronizedObservableCollection<Int32> _version;
 
         /// <summary>
         /// Gets or sets the sysdiagrambase version.
         /// </summary>
 
-        [Column("version")]
-
-        public  Nullable<Int32> Version
+        public virtual SynchronizedObservableCollection<Int32> Version
         {
             get 
             {
@@ -88,7 +85,7 @@ namespace Tango.BL.Entities
         /// <summary>
         /// Called when the Version has changed.
         /// </summary>
-        protected virtual void OnVersionChanged(Nullable<Int32> version)
+        protected virtual void OnVersionChanged(SynchronizedObservableCollection<Int32> version)
         {
             VersionChanged?.Invoke(this, version);
             RaisePropertyChanged(nameof(Version));
@@ -108,6 +105,9 @@ namespace Tango.BL.Entities
         /// </summary>
         public SysdiagramBase() : base()
         {
+
+            Version = new SynchronizedObservableCollection<Int32>();
+
         }
     }
 }