diff --git a/libreplan-webapp/src/main/webapp/templates/_editTemplate.zul b/libreplan-webapp/src/main/webapp/templates/_editTemplate.zul
index 64f12a350..18bd32ed1 100644
--- a/libreplan-webapp/src/main/webapp/templates/_editTemplate.zul
+++ b/libreplan-webapp/src/main/webapp/templates/_editTemplate.zul
@@ -66,7 +66,8 @@
                         <row>
                             <label value="${i18n:_('Code')}" />
                             <hbox>
-                                <textbox value="@{templatesForOrdersController.template.code}" width="250px" />
+                                <textbox value="@{templatesForOrdersController.template.code}" width="250px"
+                                    constraint="no empty:${i18n:_('cannot be null or empty')}" />
                             </hbox>
                         </row>
                         <row>
@@ -128,4 +129,4 @@
         <button label="${i18n:_('Cancel')}" onClick="templatesForOrdersController.cancel()"
             sclass="cancel-button global-action" />
     </hbox>
-</window>
\ No newline at end of file
+</window>