Index: tryton/gui/window/view_form/model/record.py
===================================================================

--- a/tryton/tryton/gui/window/view_form/model/record.py
+++ b/tryton/tryton/gui/window/view_form/model/record.py
@@ -415,6 +415,8 @@
         for fieldname, value in val.items():
             if fieldname not in self.group.fields:
                 continue
+            if fieldname == self.group.exclude_field:
+                continue
             if isinstance(self.group.fields[fieldname], (fields.M2OField,
                         fields.ReferenceField)):
                 field_rec_name = fieldname + '.rec_name'

Index: tryton/gui/window/view_form/view/form_gtk/many2one.py
===================================================================

--- a/tryton/tryton/gui/window/view_form/view/form_gtk/many2one.py
+++ b/tryton/tryton/gui/window/view_form/view/form_gtk/many2one.py
@@ -195,7 +195,8 @@
         context = self.field.context_get(self.record)
         return Screen(self.get_model(), domain=domain, context=context,
             mode=['form'], view_ids=self.attrs.get('view_ids', '').split(','),
-            views_preload=self.attrs.get('views', {}), readonly=self._readonly)
+            views_preload=self.attrs.get('views', {}), readonly=self._readonly,
+            exclude_field=self.attrs.get('relation_field'))
 
     def sig_new(self, *args):
         model = self.get_model()