Why does the prefabOverride not work on fields marked as SerializeField?

Hi there,

I have the following problem: I want to run a custom serialization algorithm on a component (MonoBehaviour) which uses a lot of private fields being set by properties. The fields are set by an custom editor by using the properties. The fields are using the SerializeField attribute.

E.g.:

 /// <summary>
 ///   The custom animation name.
 /// </summary>
 [SerializeField]
 private string animationName;

 /// <summary>
 ///   The custom animation name.
 /// </summary>
 public string AnimationName
 {
     get
     {
         return this.animationName;
     }

     set
     {
         if (this.animationName == value)
         {
             return;
         }

         this.animationName = value;

         this.RunValidationAlgorithmOnTheNewName();
     }
 }

The component using this field is part of a gameobject been instantiated from a prefab. The value gets changed in the prefab instance but not applied to the prefab, which is the way its intented.

When saving and loading this gameobject to and from a scene everything works fine. But when using the custom serialization it simply does not work for SerializeField-fields. This is the way I try to determine if a field has been changed from its original prefab value:

 // use untiy to get information about modified values
 SerializedObject serObj = new SerializedObject(theScriptComponent);

 SerializedProperty property = serObj.GetIterator();
 property.Next(true);

 // store attributenames of modified values
 do
 {
     // This is where Unity says false on SerializeField fields.
     if (property.prefabOverride) 
     {
         Debug.Log("Property '" + property.name + "' has an overwritten value.");
     }
 }
 while (property.Next(false));

Is there a way to get the correct modification value of the prefab instances fields, which are marked with SerializeField? Eventually it works when using the scene format.

Thanks in advance.