diff --git a/java/bundles/org.eclipse.set.ppmodel.extensions.container/src/org/eclipse/set/ppmodel/extensions/container/MultiContainer_AttributeGroup.xtend b/java/bundles/org.eclipse.set.ppmodel.extensions.container/src/org/eclipse/set/ppmodel/extensions/container/MultiContainer_AttributeGroup.xtend
index 4f004d61de..704059f576 100644
--- a/java/bundles/org.eclipse.set.ppmodel.extensions.container/src/org/eclipse/set/ppmodel/extensions/container/MultiContainer_AttributeGroup.xtend
+++ b/java/bundles/org.eclipse.set.ppmodel.extensions.container/src/org/eclipse/set/ppmodel/extensions/container/MultiContainer_AttributeGroup.xtend
@@ -195,8 +195,9 @@ class MultiContainer_AttributeGroup {
 		Assert.isTrue(!containers.empty)
 		this.containers = containers
 		cacheString = "multi/" + containers.map [
-			(eContainer as LST_Zustand).identitaet.wert
-		].join
+			'''«(eContainer as LST_Zustand).identitaet.wert»/«eContainer.hashCode» '''
+			
+		].join("/")
 	}
 
 	/**