An additional problem is that the entry can be the default selection!
So the user makes no changes in the dropdownchoice!
Overriding the methods wantOnSelectionChangedNotifications() and onSelectionChanged() is not the right way! I just want to add an info-message!
Today I debugged my code and the result is that the method getModelObject() in the method isChoiceAvailable() provides null! In the page I use a CompoundPropertyModel and the id "xxx" is a property of the page-model-object!
Daniel
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