Конвертер - тип Стакан - Свойство - ошибка

Доброго времени суток.
Дизайнер в4.3.17.0
При типе конвертера Стакана при выборе Свойств выпадает ошибка.

Фрагмент:
Название Время Тип Сообщение
S#.Designer 13.11.2016 0:49:04 Error "System.Reflection.TargetInvocationException: Адресат вызова создал исключение. ---> System.Exception: Duplicated primary key.
в DevExpress.Xpf.Grid.TreeList.TreeListSelfReferenceDataHelper.GetNodeDictionaryFromListSource()
в DevExpress.Xpf.Grid.TreeList.TreeListSelfReferenceDataHelper.LoadDataCore()
в DevExpress.Xpf.Grid.TreeList.TreeListSelfReferenceDataHelper.LoadData()
в DevExpress.Xpf.Grid.TreeList.TreeListDataProvider.DoRefresh(Boolean keepNodesState)
в DevExpress.Xpf.Grid.TreeList.TreeListDataProvider.OnDataSourceChanged()
в DevExpress.Xpf.Data.DataProviderBase.set_DataSource(Object value)
в DevExpress.Xpf.Grid.DataControlBase.SetDataSource()
в DevExpress.Xpf.Grid.DataControlBase.<OnItemsSourceChanged>b__60()
в DevExpress.Xpf.Core.Locker.DoLockedAction(Action action)
в DevExpress.Xpf.Core.Native.LockedPostponedAction.PerformLockedAction(Action primaryAction)
в DevExpress.Xpf.Grid.DataControlBase.<OnItemsSourceChanged>b__5f()
в DevExpress.Xpf.Core.Locker.DoLockedAction(Action action)
в DevExpress.Xpf.Grid.DataControlBase.OnItemsSourceChanged(Object oldValue, Object newValue)
в DevExpress.Xpf.Grid.GridControl.OnItemsSourceChanged(Object oldValue, Object newValue)
в DevExpress.Xpf.Grid.DataControlBase.OnDataSourceChanged(DependencyObject dObject, DependencyPropertyChangedEventArgs e)
в System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
в System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
в DevExpress.Xpf.Grid.DataControlBase.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
в System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
в System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)