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- create a class from template (New From Template... -> Classes -> Class) - name it e.g. Class1 - expand one sublevel of this class (see picture) - in the Explorer select class and its subnode (e.g. Class1, class Class1 rows) - delete selected items => exception is thrown (see att.)
Priority is changed to P4 (normal).
ExplorerActions modified to disable delete action when node and its parent node are selected. That should solve the problem.