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Currently, once a representing classifier is selected for a lifeline, a different representing classifier can be selected but the representing classifier can not be removed completely from the lifeline. There are situations where representing classifier needs to be removed from the lifeline and the tool should allow this to be done. Workaround for now: - create a new or dummy class - change the lifeline to represent that dummy class - delete the dummy class - press the Diagram Synchronization button from the diagram window toolbar or right-click on the lifeline and select Synchronize Element with Data to refresh the lifeline Now, the representing classifier should disappear.