v15.2 - Copy and paste of Item structure in browser causes duplicate GUID errors

[Paolo F Cantoni]

While investigating executable BPMN, we discovered that in order for the higher-level activity to "call" its "composite, the "called items" need to be nested under the calling activity.  So, in order to test multiple scenarios, we need to nest the same set of items under each scenario.  So, naturally, we used <context menu> | Copy /Paste... ► Copy to Clipboard ► Full Structure for Duplication on the element in the browser.

When we came to paste them, in their new location we got a bunch of Duplicate GUID Errors - which we had to repair with a Consistency Check.

Copying them within a package works fine...

Reported,
Paolo