diff --git a/tryton/gui/window/view_form/view/list_gtk/widget.py b/tryton/gui/window/view_form/view/list_gtk/widget.py
index 88548938b2..4680aa8f8d 100644
--- a/tryton/gui/window/view_form/view/list_gtk/widget.py
+++ b/tryton/gui/window/view_form/view/list_gtk/widget.py
@@ -575,6 +575,10 @@ class M2O(GenericText):
         record, field = self._get_record_field(path)
 
         def changed(editable):
+            text = editable.get_text()
+            if field.get_client(record) != text:
+                field.set_client(record, (None, ''))
+
             if field.get(record):
                 stock1, tooltip1 = 'tryton-open', _("Open the record <F2>")
                 stock2, tooltip2 = 'tryton-clear', _("Clear the record <Del>")