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When you create a new element from the toolbar, 2 commands are executed, so you need to do 2 undo to get the initial state. Steps to reproduce, using the EMF-Facet example Open Ecore Tabular Editor : 1/ Create an Ecore Model 2/ Select the root package and select in the popup menu, the action Open Ecore Tabular Editor 3/ Create an EClass using the action Create New Element in the toolbar 4/ Do 1 Undo : the EClass is removed from the table 5/ Do 1 Undo : the EClass is removed from the Ecore Model