remove extraneous super-interface from CollectionMapping2_0
diff --git a/jpa/plugins/org.eclipse.jpt.jpa.core/src/org/eclipse/jpt/jpa/core/jpa2/context/CollectionMapping2_0.java b/jpa/plugins/org.eclipse.jpt.jpa.core/src/org/eclipse/jpt/jpa/core/jpa2/context/CollectionMapping2_0.java
index 113d12c..100f18e 100644
--- a/jpa/plugins/org.eclipse.jpt.jpa.core/src/org/eclipse/jpt/jpa/core/jpa2/context/CollectionMapping2_0.java
+++ b/jpa/plugins/org.eclipse.jpt.jpa.core/src/org/eclipse/jpt/jpa/core/jpa2/context/CollectionMapping2_0.java
@@ -30,7 +30,7 @@
  * @since 2.3
  */
 public interface CollectionMapping2_0
-	extends CollectionMapping, AttributeMapping2_0, ConvertibleKeyMapping2_0
+	extends CollectionMapping, ConvertibleKeyMapping2_0
 {
 	// ********** map key class **********