diff --git a/golem_activity/__manifest__.py b/golem_activity/__manifest__.py
index ede28ce..cf63b8e 100644
--- a/golem_activity/__manifest__.py
+++ b/golem_activity/__manifest__.py
@@ -18,9 +18,9 @@
 {
     'name': 'GOLEM activities',
     'summary': 'Extends Odoo products for multi-activity',
-    'version': '10.0.2.0.0',
+    'version': '10.0.2.1.0',
     'category': 'GOLEM',
-    'author': 'Fabien Bourgeois',
+    'author': 'Fabien Bourgeois, Michel Dessenne',
     'license': 'AGPL-3',
     'application': True,
     'installable': True,
diff --git a/golem_activity/i18n/fr.po b/golem_activity/i18n/fr.po
index d1b65f0..702d3fe 100644
--- a/golem_activity/i18n/fr.po
+++ b/golem_activity/i18n/fr.po
@@ -6,8 +6,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Odoo Server 10.0\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2017-06-14 06:14+0000\n"
-"PO-Revision-Date: 2017-06-14 06:14+0000\n"
+"POT-Creation-Date: 2018-02-01 16:28+0000\n"
+"PO-Revision-Date: 2018-02-01 16:28+0000\n"
 "Last-Translator: <>\n"
 "Language-Team: \n"
 "MIME-Version: 1.0\n"
@@ -78,6 +78,18 @@ msgstr "Nom de l'activité"
 msgid "Activity Types"
 msgstr "Types d'activité"
 
+#. module: golem_activity
+#: code:addons/golem_activity/models/golem_activity.py:120
+#, python-format
+msgid "Activity end date can not be set after linked season end."
+msgstr "La date de fin ne peut pas être apprêt la date de fin de la saison."
+
+#. module: golem_activity
+#: code:addons/golem_activity/models/golem_activity.py:116
+#, python-format
+msgid "Activity start date can not be set before linked season start."
+msgstr "La date de début ne peut pas être avant la date de début de la saison."
+
 #. module: golem_activity
 #: model:ir.model.fields,field_description:golem_activity.field_golem_activity_type_name
 msgid "Activity type"
@@ -273,7 +285,7 @@ msgid "Expense Account"
 msgstr "Compte de dépenses"
 
 #. module: golem_activity
-#: code:addons/golem_activity/models/golem_activity.py:120
+#: code:addons/golem_activity/models/golem_activity.py:138
 #: selection:golem.activity,weekday:0
 #, python-format
 msgid "Friday"
@@ -350,6 +362,11 @@ msgstr "Numéro d'article international (IAN) utilisé pour identifier cet artic
 msgid "Invoicing"
 msgstr "Facturation"
 
+#. module: golem_activity
+#: model:ir.model.fields,field_description:golem_activity.field_golem_activity_is_fullseason
+msgid "Is full season?"
+msgstr "Est sur toute la saison ?"
+
 #. module: golem_activity
 #: model:ir.model.fields,field_description:golem_activity.field_golem_activity_is_recurrent
 #: model:ir.model.fields,field_description:golem_activity.field_golem_activity_type_is_recurrent
@@ -405,7 +422,7 @@ msgid "Membership Start Date"
 msgstr "Date de début d'adhésion"
 
 #. module: golem_activity
-#: code:addons/golem_activity/models/golem_activity.py:116
+#: code:addons/golem_activity/models/golem_activity.py:134
 #: selection:golem.activity,weekday:0
 #, python-format
 msgid "Monday"
@@ -493,7 +510,7 @@ msgid "Sale Price"
 msgstr "Prix de vente"
 
 #. module: golem_activity
-#: code:addons/golem_activity/models/golem_activity.py:121
+#: code:addons/golem_activity/models/golem_activity.py:139
 #: selection:golem.activity,weekday:0
 #, python-format
 msgid "Saturday"
@@ -540,8 +557,8 @@ msgid "Start date"
 msgstr "Date de début"
 
 #. module: golem_activity
-#: code:addons/golem_activity/models/golem_activity.py:103
-#: code:addons/golem_activity/models/golem_activity.py:138
+#: code:addons/golem_activity/models/golem_activity.py:113
+#: code:addons/golem_activity/models/golem_activity.py:156
 #, python-format
 msgid "Start of the period cannot be after end of the period."
 msgstr "Le début de la période ne peut être antérieure à sa fin"
@@ -557,7 +574,7 @@ msgid "Stop time"
 msgstr "Heure de fin"
 
 #. module: golem_activity
-#: code:addons/golem_activity/models/golem_activity.py:122
+#: code:addons/golem_activity/models/golem_activity.py:140
 #: selection:golem.activity,weekday:0
 #, python-format
 msgid "Sunday"
@@ -601,7 +618,7 @@ msgid "This field holds the image used as image for the activity."
 msgstr "This field holds the image used as image for the activity."
 
 #. module: golem_activity
-#: code:addons/golem_activity/models/golem_activity.py:119
+#: code:addons/golem_activity/models/golem_activity.py:137
 #: selection:golem.activity,weekday:0
 #, python-format
 msgid "Thursday"
@@ -618,14 +635,14 @@ msgid "True"
 msgstr "True"
 
 #. module: golem_activity
-#: code:addons/golem_activity/models/golem_activity.py:117
+#: code:addons/golem_activity/models/golem_activity.py:135
 #: selection:golem.activity,weekday:0
 #, python-format
 msgid "Tuesday"
 msgstr "Mardi"
 
 #. module: golem_activity
-#: model:ir.model.fields,field_description:golem_activity.field_golem_activity_type_id_3959
+#: model:ir.model.fields,field_description:golem_activity.field_golem_activity_type_id_3891
 msgid "Type"
 msgstr "Type"
 
@@ -655,7 +672,7 @@ msgid "Warranty"
 msgstr "Garantie"
 
 #. module: golem_activity
-#: code:addons/golem_activity/models/golem_activity.py:118
+#: code:addons/golem_activity/models/golem_activity.py:136
 #: selection:golem.activity,weekday:0
 #, python-format
 msgid "Wednesday"
@@ -680,4 +697,3 @@ msgstr "Atelier"
 #: model:ir.ui.view,arch_db:golem_activity.golem_activity_form
 msgid "describe the activity characteristics..."
 msgstr "Décrivez ici les caractéristiques de l'activité..."
-
diff --git a/golem_activity/i18n/golem_activity.pot b/golem_activity/i18n/golem_activity.pot
index 0118dfc..3b770b9 100644
--- a/golem_activity/i18n/golem_activity.pot
+++ b/golem_activity/i18n/golem_activity.pot
@@ -6,8 +6,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Odoo Server 10.0\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2017-06-14 06:14+0000\n"
-"PO-Revision-Date: 2017-06-14 06:14+0000\n"
+"POT-Creation-Date: 2018-02-01 16:28+0000\n"
+"PO-Revision-Date: 2018-02-01 16:28+0000\n"
 "Last-Translator: <>\n"
 "Language-Team: \n"
 "MIME-Version: 1.0\n"
@@ -74,6 +74,18 @@ msgstr ""
 msgid "Activity Types"
 msgstr ""
 
+#. module: golem_activity
+#: code:addons/golem_activity/models/golem_activity.py:120
+#, python-format
+msgid "Activity end date can not be set after linked season start."
+msgstr ""
+
+#. module: golem_activity
+#: code:addons/golem_activity/models/golem_activity.py:116
+#, python-format
+msgid "Activity start date can not be set before linked season start."
+msgstr ""
+
 #. module: golem_activity
 #: model:ir.model.fields,field_description:golem_activity.field_golem_activity_type_name
 msgid "Activity type"
@@ -269,7 +281,7 @@ msgid "Expense Account"
 msgstr ""
 
 #. module: golem_activity
-#: code:addons/golem_activity/models/golem_activity.py:120
+#: code:addons/golem_activity/models/golem_activity.py:138
 #: selection:golem.activity,weekday:0
 #, python-format
 msgid "Friday"
@@ -346,6 +358,11 @@ msgstr ""
 msgid "Invoicing"
 msgstr ""
 
+#. module: golem_activity
+#: model:ir.model.fields,field_description:golem_activity.field_golem_activity_is_fullseason
+msgid "Is full season?"
+msgstr ""
+
 #. module: golem_activity
 #: model:ir.model.fields,field_description:golem_activity.field_golem_activity_is_recurrent
 #: model:ir.model.fields,field_description:golem_activity.field_golem_activity_type_is_recurrent
@@ -401,7 +418,7 @@ msgid "Membership Start Date"
 msgstr ""
 
 #. module: golem_activity
-#: code:addons/golem_activity/models/golem_activity.py:116
+#: code:addons/golem_activity/models/golem_activity.py:134
 #: selection:golem.activity,weekday:0
 #, python-format
 msgid "Monday"
@@ -489,7 +506,7 @@ msgid "Sale Price"
 msgstr ""
 
 #. module: golem_activity
-#: code:addons/golem_activity/models/golem_activity.py:121
+#: code:addons/golem_activity/models/golem_activity.py:139
 #: selection:golem.activity,weekday:0
 #, python-format
 msgid "Saturday"
@@ -536,8 +553,8 @@ msgid "Start date"
 msgstr ""
 
 #. module: golem_activity
-#: code:addons/golem_activity/models/golem_activity.py:103
-#: code:addons/golem_activity/models/golem_activity.py:138
+#: code:addons/golem_activity/models/golem_activity.py:113
+#: code:addons/golem_activity/models/golem_activity.py:156
 #, python-format
 msgid "Start of the period cannot be after end of the period."
 msgstr ""
@@ -553,7 +570,7 @@ msgid "Stop time"
 msgstr ""
 
 #. module: golem_activity
-#: code:addons/golem_activity/models/golem_activity.py:122
+#: code:addons/golem_activity/models/golem_activity.py:140
 #: selection:golem.activity,weekday:0
 #, python-format
 msgid "Sunday"
@@ -597,7 +614,7 @@ msgid "This field holds the image used as image for the activity."
 msgstr ""
 
 #. module: golem_activity
-#: code:addons/golem_activity/models/golem_activity.py:119
+#: code:addons/golem_activity/models/golem_activity.py:137
 #: selection:golem.activity,weekday:0
 #, python-format
 msgid "Thursday"
@@ -614,14 +631,14 @@ msgid "True"
 msgstr ""
 
 #. module: golem_activity
-#: code:addons/golem_activity/models/golem_activity.py:117
+#: code:addons/golem_activity/models/golem_activity.py:135
 #: selection:golem.activity,weekday:0
 #, python-format
 msgid "Tuesday"
 msgstr ""
 
 #. module: golem_activity
-#: model:ir.model.fields,field_description:golem_activity.field_golem_activity_type_id_3959
+#: model:ir.model.fields,field_description:golem_activity.field_golem_activity_type_id_3891
 msgid "Type"
 msgstr ""
 
@@ -651,7 +668,7 @@ msgid "Warranty"
 msgstr ""
 
 #. module: golem_activity
-#: code:addons/golem_activity/models/golem_activity.py:118
+#: code:addons/golem_activity/models/golem_activity.py:136
 #: selection:golem.activity,weekday:0
 #, python-format
 msgid "Wednesday"
diff --git a/golem_activity/models/golem_activity.py b/golem_activity/models/golem_activity.py
index 7f0a504..bb25069 100644
--- a/golem_activity/models/golem_activity.py
+++ b/golem_activity/models/golem_activity.py
@@ -30,6 +30,7 @@ class GolemActivityType(models.Model):
     name = fields.Char('Activity type', required=True, translate=True)
     is_recurrent = fields.Boolean('Is recurrent?')
 
+
 class GolemActivity(models.Model):
     """ GOLEM Activity """
     _name = 'golem.activity'
@@ -46,8 +47,17 @@ class GolemActivity(models.Model):
 
     full_name = fields.Char('Name', compute='_compute_full_name', store=True,
                             index=True)
+    is_fullseason = fields.Boolean('Is full season?',
+                                   compute='_compute_is_full_season')
+
+    @api.depends('date_start', 'date_stop')
+    def _compute_is_full_season(self):
+        """ Display date for is full season """
+        for activity in self:
+            if activity.date_start == activity.season_id.date_start and \
+               activity.date_stop == activity.season_id.date_end:
+                activity.is_fullseason = True
 
-    @api.multi
     @api.depends('name', 'default_code')
     def _compute_full_name(self):
         """ Provide a better displayed name """
@@ -102,6 +112,14 @@ class GolemActivity(models.Model):
                     activity.date_start > activity.date_stop:
                 raise models.ValidationError(_('Start of the period cannot be '
                                                'after end of the period.'))
+            if activity.season_id.date_start > activity.date_start:
+                msg = _(u'Activity start date can not be set before '
+                        'linked season start.')
+                raise models.ValidationError(msg)
+            if activity.season_id.date_end < activity.date_stop:
+                msg = _(u'Activity end date can not be set after '
+                        'linked season end.')
+                raise models.ValidationError(msg)
 
     @api.onchange('season_id')
     def _onchange_season_dates(self):
diff --git a/golem_activity/views/golem_activity_views.xml b/golem_activity/views/golem_activity_views.xml
index 0912382..f961f60 100644
--- a/golem_activity/views/golem_activity_views.xml
+++ b/golem_activity/views/golem_activity_views.xml
@@ -59,10 +59,15 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
                       attrs="{'invisible': [('is_recurrent', '=', False)]}" />
                     <field name="hour_stop" widget="float_time"
                       attrs="{'invisible': [('is_recurrent', '=', False)]}" />
+
+                    <field name="is_fullseason" readonly="False"
+                      attrs="{'invisible':[('is_recurrent', '=', False)]}" />
                     <field name="date_start"
-                      attrs="{'invisible': [('is_recurrent', '=', True)]}" />
+                      attrs="{'invisible':[('is_recurrent', '=', True),
+                             ('is_fullseason', '=', True)]}" />
                     <field name="date_stop"
-                      attrs="{'invisible': [('is_recurrent', '=', True)]}" />
+                      attrs="{'invisible':[('is_recurrent', '=', True),
+                             ('is_fullseason', '=', True)]}" />
                   </group>
                   <group name="places">
                   </group>
@@ -111,8 +116,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
           <field name="animator_id" />
           <field name="weekday" string="Day"
               attrs="{'invisible': [('is_recurrent', '=', False)]}" />
-          <field name="date_start" string="Date"
-              attrs="{'invisible': [('is_recurrent', '=', True)]}" />
+          <field name="date_start" string="Date" />
           <field name="list_price" sum="True" />
         </tree>
       </field>