title: Unity: Inspector can't find field of ScriptableObject
body: <p>I'm having trouble showing a public field of a ScriptableObject which is a child of the component I'm inspecting. While I can easily do this in another way, I need this method to work for other variables. (ReorderableLists)</p>
  
  <p>I simplified the problem, maybe I was just doing something obvious wrong, but I can't see what I'm doing wrong.</p>
  
  <p>Code + error:
  <a href="http://answers.unity3d.com/storage/temp/70243-error.png" rel="nofollow">http://answers.unity3d.com/storage/temp/70243-error.png</a></p>
  
  <pre><code>class SomeComponent : MonoBehaviour{
     public MyScriptable scriptable; //instantiated and saved as asset
  }
  
  [Serializable] class MyScriptable : ScriptableObject{
     [SerializeField] public float value = 0.1f;
  }
  
  [CustomEditor(typeof(SomeComponent))] class SomeComponentEditor : Editor{
       public override void OnInspectorGUI() {
  
           if((target as SomeComponent).scriptable==null) (target as SomeComponent).scriptable = ScriptableObject.CreateInstance(typeof(MyScriptable)) as MyScriptable;
  
           EditorGUILayout.PropertyField(serializedObject.FindProperty("scriptable"));                                 
           //shows the asset
           EditorGUILayout.PropertyField(serializedObject.FindProperty("scriptable").FindPropertyRelative("value"));   
           //error
      }
  }
  </code></pre>