your observation is correct to some extent. If the elements of the projects are organized in AOT view i.e. Grouped by EllementTypes in a hierarchical view organized; Project will accept duplicate elements in such case. If your Project elements are independent of grouping and AOT structure i.e. elements are just dragged in Project without organization of those in AOT; in such case Project will Not accept duplicate elements. From your initial Post, I thought that you are having a kind of project, in which there is no Grouping of elements in AOT view.
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