diff --git a/product/ERP5Form/FormulatorPatch.py b/product/ERP5Form/FormulatorPatch.py
index bb34b7aa545c613ccde570a1c1870f3ea64c8b72..7d7b7f905d3942a0353e89782f1bfa4b44300f06 100644
--- a/product/ERP5Form/FormulatorPatch.py
+++ b/product/ERP5Form/FormulatorPatch.py
@@ -1302,3 +1302,21 @@ def TALESWidget_render_view(self, field, value):
   return text
 
 TALESWidget.render_view = TALESWidget_render_view
+
+def Widget_render_dict(self, field, value):
+  """
+  This is yet another field rendering. It is designed to allow code to
+  understand field's value data by providing its type and format when
+  applicable.
+  """
+  return None
+Widget.render_dict = Widget_render_dict
+
+def Field_render_dict(self, value=None, REQUEST=None, key=None, **kw):
+  """
+  This is yet another field rendering. It is designed to allow code to
+  understand field's value data by providing its type and format when
+  applicable.
+  """
+  return self.widget.render_dict(self, value)
+Field.render_dict = Field_render_dict
diff --git a/product/ERP5Form/ListBox.py b/product/ERP5Form/ListBox.py
index 82cf6e4308d977228ab19d218a2af6b108412f83..89d21ff5d20820f652849fad3b555b198b629a7c 100644
--- a/product/ERP5Form/ListBox.py
+++ b/product/ERP5Form/ListBox.py
@@ -941,9 +941,9 @@ class ListBoxRenderer:
             search_field = listbox_form.get_field(editable_field_id)
           else:
             continue
-        render_dict = getattr(search_field.widget, 'render_dict', None)
+        render_dict = search_field.render_dict(search_value)
         if render_dict is not None:
-          params[search_id] = render_dict(search_field, search_value)
+          params[search_id] = render_dict
 
       # Set parameters, depending on the list method.
       list_method_name = self.getListMethodName()
diff --git a/product/ERP5Form/ProxyField.py b/product/ERP5Form/ProxyField.py
index dfdf2016ccf0386265f51d3a0dc77e82c7b2b57a..53700360fcb33ce9dd491beac2b9a16af6b5e32c 100644
--- a/product/ERP5Form/ProxyField.py
+++ b/product/ERP5Form/ProxyField.py
@@ -120,6 +120,7 @@ class ProxyWidget(Widget.Widget):
   render_view = WidgetDelegatedMethod('render_view', default='')
   render_pdf = WidgetDelegatedMethod('render_pdf', default='')
   render_css = WidgetDelegatedMethod('render_css', default='')
+  render_dict = WidgetDelegatedMethod('render_dict', default=None)
   get_javascript_list = WidgetDelegatedMethod(
                             'get_javascript_list', default=[])