diff -r 02d9ff8d1803 -r 3d097899a717 src/pyams_portal/zmi/portlet.py
--- a/src/pyams_portal/zmi/portlet.py	Wed Apr 11 11:35:07 2018 +0200
+++ b/src/pyams_portal/zmi/portlet.py	Wed Apr 11 11:36:13 2018 +0200
@@ -36,6 +36,8 @@
 class PortletSettingsEditor(AdminDialogEditForm):
     """Portlet settings edit form"""
 
+    prefix = 'portlet_properties.'
+
     @property
     def title(self):
         translate = self.request.localizer.translate
@@ -85,7 +87,8 @@
 class PortletSettingsPropertiesEditor(InnerAdminEditForm):
     """Portlet settings properties editor"""
 
-    id = 'properties_form'
+    prefix = 'portlet_properties.'
+
     tab_label = _("Main properties")
     legend = None