Index: src/org/eclipse/bpel/ui/properties/VariablePartAssignCategory.java
===================================================================
--- src/org/eclipse/bpel/ui/properties/VariablePartAssignCategory.java	(revision 19568)
+++ src/org/eclipse/bpel/ui/properties/VariablePartAssignCategory.java	(working copy)
@@ -722,7 +722,7 @@
 			MyDOMContentBuilderImpl contentBuilder = new MyDOMContentBuilderImpl(
 					xmlDocument);
 
-			contentBuilder.setBuildPolicy(buildPolicy);
+			contentBuilder.setBuildPolicy(contentBuilder.BUILD_OPTIONAL_ELEMENTS);
 			contentBuilder.createDefaultRootContent(cmDocument,
 					cmElementDeclaration, namespaceInfoList);