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If user drag-n-drops element to diagram from another project that has imported element from the current one, User get's message that import is not allowed, but element is placed on diagram. steps to reproduce: - we have 'UmlProject1' with 'Class1' element - 'UmlProject2' with 'Class2' element - import 'Class1' to 'UmlProject2' - create class diagram 'Diagram1' in 'UmlProject1'. - drag-n-drop 'Class2' from 'UmlProject2' to 'Diagram1' importing is not allowed with the following message: 'Cannot add cyclic references'. As a result element is placed on diagram but doesn't appear as Imported Element in project tree.
may be it is related to issue 82873
see also issue 86686 - can't import element from project which previously had reference to the current one
still the same in 6.5