diff --git a/equipment.py b/equipment.py
index 7642c50..17f8726 100644
--- a/equipment.py
+++ b/equipment.py
@@ -5,7 +5,6 @@ from trytond.model import (
 from trytond.pyson import Eval, If
 from trytond.transaction  import Transaction
 from trytond.i18n import gettext
-#from .exceptions import NotSequenceEquipment
 from trytond.exceptions import UserError
 
 
@@ -27,12 +26,12 @@ class OpticalEquipment(Workflow, ModelSQL, ModelView):
     code = fields.Char(
         "Code", select=True,states={'readonly': True })
     
-    state = fields.Selection([
-             ('draft', "Draft"),
-             ('registred', "Registred"),
-             ('contrated', "Contrated")
-             ], "State",
-       required=True, readonly=True, sort=False)
+    state = fields.Selection([('draft', "Draft"),
+                              ('registred', "Registred"),
+                              ('uncontrated', "UnContrated"),
+                              ('contrated', "Contrated")
+                              ], "State",
+                             required=True, readonly=True, sort=False)
 
     company = fields.Many2One('company.company', "Company", readonly=True)
     location = fields.Many2One('stock.location', "Location",
@@ -97,6 +96,7 @@ class OpticalEquipment(Workflow, ModelSQL, ModelView):
                                              depends=['propietary'])
 
 
+
     del _states_serial
 
     @classmethod
@@ -104,7 +104,8 @@ class OpticalEquipment(Workflow, ModelSQL, ModelView):
         super(OpticalEquipment, cls).__setup__()
         cls._transitions = ({ 
             ('draft', 'registred'),
-            ('registred', 'contrated'),
+            ('registred', 'uncontrated'),
+            ('uncontrated', 'contrated'),
             })
         cls._buttons.update({
             'draft': {
@@ -118,15 +119,16 @@ class OpticalEquipment(Workflow, ModelSQL, ModelView):
         pool = Pool()
         Config = pool.get('optical_equipment.configuration')
         config = Config(1)
+        
         for equipment in equipments:
-            if config.equipment_sequence != None and not equipment.code:
-                #if not equipment.code:
-                try:
-                    equipment.code = config.equipment_sequence.get()
-                    equipment.state = 'registred'
-                    cls.save(equipments) #Revisar
-                except UserError:
-                    raise UserError(str('Validation Error'))
+            if config.equipment_sequence != None:
+                if equipment.code == None: #if not equipment.code:
+                    try:
+                        equipment.code = config.equipment_sequence.get()
+                        equipment.state = 'registred'
+                        cls.save(equipments) #Revisar
+                    except UserError:
+                        raise UserError(str('Validation Error'))
             else:
                 raise UserError(gettext('optical_equipment.msg_not_sequence_equipment'))
 
@@ -139,8 +141,7 @@ class OpticalEquipment(Workflow, ModelSQL, ModelView):
 
         maintenancesEquipment = MaintenancesEquipment.search(['equipment', '=', self.id])
         maintenances = []
-
-        #raise UserError(str(maintenancesEquipment))
+        
         for key in maintenancesEquipment:
             maintenances.append(key.id)
 
diff --git a/equipment.xml b/equipment.xml
index 0029592..57547ff 100644
--- a/equipment.xml
+++ b/equipment.xml
@@ -58,6 +58,16 @@
             <field name="count" eval="True"/>
             <field name="act_window" ref="act_optical_equipment_form"/>
         </record>
+	<record model="ir.action.act_window.domain" id="act_optical_equipment_form_domain_uncontrated">
+            <field name="name">UnContrated</field>
+            <field name="sequence" eval="30"/>
+            <field name="domain"
+                eval="[('state', '=', 'uncontrated')]"
+                pyson="1"/>
+            <field name="count" eval="True"/>
+            <field name="act_window" ref="act_optical_equipment_form"/>
+        </record>
+
         <record model="ir.action.act_window.domain" id="act_optical_equipment_form_domain_contrated">
             <field name="name">Contrated</field>
             <field name="sequence" eval="30"/>
diff --git a/sale.py b/sale.py
index 134f1ab..24b2eaa 100644
--- a/sale.py
+++ b/sale.py
@@ -118,7 +118,7 @@ class SaleLine(metaclass=PoolMeta):
     product_equipment = fields.Boolean("Product Equipment")
     equipment = fields.Many2One('optical_equipment.equipment', "Equipment",
                                 domain=[('state', '=', 'registred')],
-                                states={'invisible': If(~Eval('product_equipment'), True)})
+                                states={'invisible': If(~Eval('product_equipment'), True)},)
     address_equipment = fields.Many2One('party.address', "Direccion")
     unit_digits = fields.Function(fields.Integer('Unit Digits'),
         'on_change_with_unit_digits')
diff --git a/subscription.py b/subscription.py
index b26e214..1b3c5cb 100644
--- a/subscription.py
+++ b/subscription.py
@@ -10,7 +10,6 @@ class Subscription(metaclass=PoolMeta):
 
     equipments = fields.Many2Many('sale.subscription-optical_equipment.equipment', 'subscription',
                                   'equipment', "Equipments")
-        
     @classmethod
     @ModelView.button
     @Workflow.transition('running')
@@ -27,7 +26,10 @@ class SubscriptionEquipment(ModelSQL):
     __name__ = 'sale.subscription-optical_equipment.equipment'
     
     subscription = fields.Many2One('sale.subscription', 'Subscription', select=True)
-    equipment = fields.Many2One('optical_equipment.equipment', 'Equipment', select=True)
+    equipment = fields.Many2One('optical_equipment.equipment', 'Equipment', select=True,
+                                domain=[('state', '=', 'registred'),
+                                        ('state', '=', 'uncontrated')],
+                                depends=['state'])
 
     
 class Line(metaclass=PoolMeta):