diff --git a/tryton/gui/window/view_form/model/field.py b/tryton/gui/window/view_form/model/field.py
index 4aad14f02a..9cf9ad3588 100644
--- a/tryton/gui/window/view_form/model/field.py
+++ b/tryton/gui/window/view_form/model/field.py
@@ -763,7 +763,7 @@ class ReferenceField(CharField):
         ref_model, (ref_id, ref_str) = value
         if ref_model:
             ref_id = int(ref_id)
-            if not ref_id:
+            if ref_id < 0:
                 ref_str = ''
             if not ref_str and ref_id >= 0:
                 args = ('model', ref_model, 'read', ref_id,
@@ -779,7 +779,7 @@ class ReferenceField(CharField):
                     record.value[self.name] = ref_model, (ref_id, result)
                     record.value[self.name + '.rec_name'] = result
                 else:
-                    record.value[self.name] = ref_model, (0, '')
+                    record.value[self.name] = ref_model, (-1, '')
                     record.value[self.name + '.rec_name'] = ''
             else:
                 record.value[self.name] = ref_model, (ref_id, ref_str)
diff --git a/tryton/gui/window/view_form/view/form_gtk/many2one.py b/tryton/gui/window/view_form/view/form_gtk/many2one.py
index 8355e29582..74e13d1110 100644
--- a/tryton/gui/window/view_form/view/form_gtk/many2one.py
+++ b/tryton/gui/window/view_form/view/form_gtk/many2one.py
@@ -267,7 +267,7 @@ class Many2One(WidgetInterface):
     def _populate_popup(self, widget, menu):
         value = self.field.get(self.record)
         args = ('model', 'ir.action.keyword', 'get_keyword',
-                'form_relate', (self.attrs['relation'], 0), rpc.CONTEXT)
+                'form_relate', (self.attrs['relation'], -1), rpc.CONTEXT)
         try:
             relates = rpc.execute(*args)
         except TrytonServerError, exception:
diff --git a/tryton/gui/window/view_form/view/form_gtk/reference.py b/tryton/gui/window/view_form/view/form_gtk/reference.py
index 28c586e99a..cad6c5f074 100644
--- a/tryton/gui/window/view_form/view/form_gtk/reference.py
+++ b/tryton/gui/window/view_form/view/form_gtk/reference.py
@@ -155,7 +155,7 @@ class Reference(WidgetInterface):
 
         self.focus_out = False
         if not value:
-            model, (obj_id, name) = self.get_model() or '', (0, '')
+            model, (obj_id, name) = self.get_model() or '', (-1, '')
         else:
             try:
                 model, (obj_id, name) = value
@@ -250,18 +250,18 @@ class Reference(WidgetInterface):
         if not self.changed:
             return
         self.wid_text.set_text('')
-        self.field.set_client(self.record, (self.get_model(), (0, '')))
+        self.field.set_client(self.record, (self.get_model(), (-1, '')))
 
     def sig_changed(self, *args):
         if not self.changed:
             return False
         val = self.field.get_client(self.record)
         if not val:
-            model, (obj_id, name) = '', (0, '')
+            model, (obj_id, name) = '', (-1, '')
         else:
             model, (obj_id, name) = val
         if self.get_model() and obj_id:
-            self.field.set_client(self.record, (self.get_model(), (0, '')))
+            self.field.set_client(self.record, (self.get_model(), (-1, '')))
             self.display(self.record, self.field)
         return False
 
@@ -276,7 +276,7 @@ class Reference(WidgetInterface):
         value = field.get_client(record)
         img = gtk.Image()
         if not value:
-            model, (obj_id, name) = '', (0, '')
+            model, (obj_id, name) = '', (-1, '')
         else:
             model, (obj_id, name) = value
         if model:
diff --git a/tryton/gui/window/view_form/view/list.py b/tryton/gui/window/view_form/view/list.py
index 51fe2b4da7..c06febb9c2 100644
--- a/tryton/gui/window/view_form/view/list.py
+++ b/tryton/gui/window/view_form/view/list.py
@@ -527,7 +527,7 @@ class ViewList(ParserView):
                 value = record[path[1].name].get(record)
                 args = ('model', 'ir.action.keyword', 'get_keyword',
                         'form_relate', (self.screen.group.fields[
-                            path[1].name].attrs['relation'], 0), rpc.CONTEXT)
+                            path[1].name].attrs['relation'], -1), rpc.CONTEXT)
                 try:
                     relates = rpc.execute(*args)
                 except TrytonServerError, exception:
diff --git a/tryton/gui/window/view_form/view/list_gtk/parser.py b/tryton/gui/window/view_form/view/list_gtk/parser.py
index 20fc43a4e5..662fc971ab 100644
--- a/tryton/gui/window/view_form/view/list_gtk/parser.py
+++ b/tryton/gui/window/view_form/view/list_gtk/parser.py
@@ -819,7 +819,7 @@ class Reference(Char):
     def get_textual_value(self, record):
         value = record[self.field_name].get_client(record)
         if not value:
-            model, (obj_id, name) = '', (0, '')
+            model, (obj_id, name) = '', (-1, '')
         else:
             model, (obj_id, name) = value
         if model: