[354363] Delete entity from diagram doesn't remove it from the project tree
diff --git a/jpa_diagram_editor/plugins/org.eclipse.jpt.jpadiagrameditor.ui/src/org/eclipse/jpt/jpadiagrameditor/ui/internal/util/JpaArtifactFactory.java b/jpa_diagram_editor/plugins/org.eclipse.jpt.jpadiagrameditor.ui/src/org/eclipse/jpt/jpadiagrameditor/ui/internal/util/JpaArtifactFactory.java
index cbedab6..6e68ace 100644
--- a/jpa_diagram_editor/plugins/org.eclipse.jpt.jpadiagrameditor.ui/src/org/eclipse/jpt/jpadiagrameditor/ui/internal/util/JpaArtifactFactory.java
+++ b/jpa_diagram_editor/plugins/org.eclipse.jpt.jpadiagrameditor.ui/src/org/eclipse/jpt/jpadiagrameditor/ui/internal/util/JpaArtifactFactory.java
@@ -431,9 +431,8 @@
 		Display.getDefault().asyncExec(new Runnable() {
 			public void run() {
 				try {
-					if (!cu.isWorkingCopy())
-						JPAEditorUtil.becomeWorkingCopy(cu);
-					cu.commitWorkingCopy(true, new NullProgressMonitor());
+					if (cu.isWorkingCopy()) 
+						cu.commitWorkingCopy(true, new NullProgressMonitor());
 					cu.save(new NullProgressMonitor(), true);
 				} catch (JavaModelException e) {
 					if (cu.getResource().getProject().isAccessible() && cu.getResource().isAccessible())