diff --git a/mdx/validation-beans.xml b/mdx/validation-beans.xml
index 527503fe..0706ddde 100644
--- a/mdx/validation-beans.xml
+++ b/mdx/validation-beans.xml
@@ -738,6 +738,7 @@
         <property name="composedStages">
             <list>
                 <ref bean="CHECK_std"/>
+                <ref bean="check_dup_display"/>
                 <ref bean="check_regscope"/>
                 <ref bean="check_namespaces"/>
             </list>