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Cloned from: 582144: [CommunicationDiagram][SiriusDiagram] Dropping a Class on a Lifeline should update the existing property instead of create a new one https://bugs.eclipse.org/bugs/show_bug.cgi?id=582144 The same bug, here, for papyrus GMF Diagram Papyrus Sirius Diagram proposes to create the property Lifeline#represents by dropping a Class on the Lifeline. This behavior is the expected one. But, when we drop a second Class on the Lifeline, a second Property is created instead of updating the first one. This behavior should be fixed.