Hello Mendix Community, I am working on a project where I have an xsd schema that I want to use as an import mapping. This schema has one entity "at the top" which has associations to all other entities (around 20, each with 5-10 attributes). When I enter the dialog to select the schema elements for the import mapping I can click "Check all" however when I then hit okay to affirm the selection I get the following error: System.ArgumentOutOfRangeException: Index must be within the bounds of the List. (Parameter 'index') at System.Collections.Generic.List`1.Insert(Int32 index, T item) at Mendix.Modeler.Utility.ListWrapper`2.Insert(Int32 index, T item) in Mendix.Modeler.Utility\Collections\List\ListWrapper.cs:line 77 at Mendix.Modeler.Utility.UndoAwareList`1.Insert(Int32 index, T item) in Mendix.Modeler.Utility\Undo\UndoAwareList.cs:line 59 at Mendix.Modeler.Utility.UndoManager.TransactionDo(IUndoManagerProvider provider, String actionDescription, ChangeSource source, Func`1 action) in Mendix.Modeler.Utility\Undo\UndoManager.cs:line 280 at Mendix.Modeler.Integration.ObjectMappingElement.InsertChild(Int32 index, IMappingElement child) in Mendix.Modeler.Integration\Mappings\MappingElements\ObjectMappingElement.cs:line 125 at Mendix.Modeler.Integration.MappingElementGenerator.UpdateMappingElements(TreeElement treeElement, IMappingElementContainer container, IList`1 selectedPaths, Int32 checkIndex) in Mendix.Modeler.Integration\Mappings\MappingElementGenerator.cs:line 62 at Mendix.Modeler.Integration.MappingElementGenerator.UpdateMappingElements(TreeElement treeElement, IMappingElementContainer container, IList`1 selectedPaths, Int32 checkIndex) in Mendix.Modeler.Integration\Mappings\MappingElementGenerator.cs:line 88 at Mendix.Modeler.Integration.MappingElementGenerator.UpdateMappingElements(TreeElement treeElement, IMappingElementContainer container, IList`1 selectedPaths, Int32 checkIndex) in Mendix.Modeler.Integration\Mappings\MappingElementGenerator.cs:line 88 at Mendix.Modeler.Integration.MappingElementGenerator.CreateMappingElements(TreeElement treeElement) in Mendix.Modeler.Integration\Mappings\MappingElementGenerator.cs:line 43 at Mendix.Modeler.Integration.View.ElementForm.<CommitChanges>b__58_0(ElementTreeNode root) in Mendix.Modeler.Integration.View\Mappings\ElementForm.cs:line 513 at Mendix.Modeler.Integration.View.ElementForm.CommitChanges() in Mendix.Modeler.Integration.View\Mappings\ElementForm.cs:line 510 at Mendix.Modeler.Integration.View.ElementForm.OnOKPressed() in Mendix.Modeler.Integration.View\Mappings\ElementForm.cs:line 504 at Mendix.Modeler.UIFramework.UIFrameworkWindow.CommitEditAndValidate() in Mendix.Modeler.UIFramework\Forms\UIFrameworkWindow.cs:line 69 at Mendix.Modeler.UIFramework.ButtonSpec.<>c__DisplayClass43_0.<GetCommandWithAction>b__0(Object _, EventArgs _) in Mendix.Modeler.UIFramework\Specs\ButtonSpec.cs:line 112 at Eto.PropertyStore.CommandWrapper.Command_Execute(Object sender, EventArgs e) at Eto.Forms.Button.OnClick(EventArgs e) at Eto.Forms.Button.Callback.OnClick(Button widget, EventArgs e) at Eto.Wpf.Forms.Controls.ButtonHandler`3.<Initialize>b__14_0(Object sender, RoutedEventArgs e) at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args) at System.Windows.Controls.Primitives.ButtonBase.OnClick() at System.Windows.Controls.Button.OnClick() at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e) at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target) at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent) at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target) at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args) at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args) at System.Windows.Input.InputManager.ProcessStagingArea() at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel) at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler) What could be the cause here? Do I have to many entities defined in my xsd? I did not find anything useful in the forum / google.