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Cloned from: 329353: [Profile Diagram] Drop n-ary Dependency with an Association as client or supplier throws Exception https://bugs.eclipse.org/bugs/show_bug.cgi?id=329353 We get an NPE, because, in CommonDeferredCreateConnectionViewCommand, the lines (IGraphicalEditPart)epRegistry.get(sourceViewAdapter.getAdapter(View.class)); returns AssociationNameEditPart and not AssociationEditPart.
Created attachment 182309 [details] A Patch I propose this patch to correct the bug.
Committed in R3110
This bug can be marked as closed fixed.