Prevent certain cells in TreeView from being selected!?

Hi,
is it possible to prevent certain cells in a TreeView from being selected?
I have a TreeView and the TreeItem's on the first "depth" should not be selectable.
I tried to add an EventHandler to the tree item and caught Event.ANY, but no event was dispatched, when a cell was selected.

Research eventFilters in combination with event.consume():
http://docs.oracle.com/javafx/2.0/api/javafx/scene/Node.html#addEventFilter%28javafx.event.EventType,%20javafx.event.EventHandler%29
Other ways to accomplish this may be via a custom selectionModel:
http://docs.oracle.com/javafx/2.0/api/javafx/scene/control/SelectionModel.html
http://docs.oracle.com/javafx/2.0/api/javafx/scene/control/TreeView.html#setSelectionModel%28javafx.scene.control.MultipleSelectionModel%29
Or by adding a ChangeListener to the selectedItems property of a the default TreeView selectionModel and setting the items to not be selected if it is the at the first "depth".

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This is a continuation of a previous thread that was closed by accident!!
The original question hasnu2019t been answered yet.
Question
=======
I am in need to EXCLUDE a specific G/L account from being selected, from the drop down list, when executing FB60 (Enter Vendor Invoice) to create a new vendor invoice ?
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THANK YOU ALL!
Here are my answers to each one:
To Mauri:
========
YES, we define the authorization Group via FS00 --> Control data, which means the relevant authorization object will be F_BKPF_BES.
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To Mohammed
============
How do I "block that GL account for postings in GL master record" ??
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To Sudhaker
=========
Could you please elaborate the solution USE VALIDATION.
I am not familiar with that!
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Dear Tom,
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Prerequisite
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Hi,
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