diff --git a/maintenance.py b/maintenance.py
index 358af74..d16c026 100644
--- a/maintenance.py
+++ b/maintenance.py
@@ -250,7 +250,7 @@ class Maintenance(Workflow, ModelSQL, ModelView):
 
     service_maintenance = fields.Many2One('optical_equipment_maintenance.service', "Maintenance Service",
                                           ondelete='CASCADE', select=True,
-                                          domain=[('state', 'in', ['draft','in_progress']),
+                                          domain=[('state', 'in', ['draft','in_progress', 'finished']),
                                                   ('propietary', '=', Eval('propietary'))],
                                           states=_states)
     code = fields.Char(