diff --git a/maintenance.py b/maintenance.py
index c91fbf3..92fcb4c 100644
--- a/maintenance.py
+++ b/maintenance.py
@@ -257,8 +257,7 @@ class Maintenance(Workflow, ModelSQL, ModelView):
     patterns_equipments = fields.Char("K Pattern", states={'readonly': True},
                                       depends=['equipment'])
     lines_calibration = fields.One2Many('optical_equipment.maintenance.calibration_sample', 'maintenance', "Lines of Calibration",
-                                        states={'readonly': Eval('state') == 'finished',
-                                                'required': Eval('equipment_calibrate')})
+                                        states={'readonly': Eval('state') == 'finished'})
     calibration_total = fields.One2Many('optical_equipment.maintenance.calibration', 'maintenance', "Calibration Total",
                                         states={'readonly': Eval('state') == 'finished'})
     maintenance_lines = fields.One2Many('optical_equipment.maintenance.line', 'maintenance', 'Lines')