There was an attempt to read or write via an subordinated property handle. This is possible only when all parent property handles in the handle hierarchy are positioned. Position errors are set, when a positioned instance is required for the requested operation (e.g. when assigning values or when positioning child property handles, in which case the parent must be positioned).

The error typically occurs, when selection in a property handle is changed during event handler processing or evaluating transient properties. In order to avoid improper deselection, cursor copies for the property handle should be used ( Property ::cursorCopy() ).

Contact the application programmer for solving the problem.