### Eclipse Workspace Patch 1.0
#P org.eclipse.uml2.uml
Index: src/org/eclipse/uml2/uml/internal/operations/ElementOperations.java
===================================================================
RCS file: /cvsroot/tools/org.eclipse.uml2/plugins/org.eclipse.uml2.uml/src/org/eclipse/uml2/uml/internal/operations/ElementOperations.java,v
retrieving revision 1.44
diff -u -r1.44 ElementOperations.java
--- src/org/eclipse/uml2/uml/internal/operations/ElementOperations.java	21 Jun 2006 13:33:12 -0000	1.44
+++ src/org/eclipse/uml2/uml/internal/operations/ElementOperations.java	6 Sep 2006 19:49:03 -0000
@@ -15,10 +15,12 @@
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
 import java.util.ListIterator;
 import java.util.Map;
+import java.util.Set;
 
 import org.eclipse.emf.common.util.BasicDiagnostic;
 import org.eclipse.emf.common.util.Diagnostic;
@@ -129,7 +131,10 @@
 			DiagnosticChain diagnostics, Map context) {
 		boolean result = true;
 
-		if (element.allOwnedElements().contains(element)) {
+        // get all elements owning the 'element'
+        Set owners = collectOwners(element);
+        
+		if (owners.contains(element)) {
 			result = false;
 
 			if (diagnostics != null) {
@@ -144,6 +149,17 @@
 
 		return result;
 	}
+    
+    protected static Set collectOwners(Element element) {
+        Set result = new HashSet();
+        Element owner = element.getOwner();
+        
+        while ((owner != null) && result.add(owner)) {
+            owner = owner.getOwner();
+        }
+        
+        return result;
+    }
 
 	/**
 	 * <!-- begin-user-doc -->