diff --git a/golem_activity/__manifest__.py b/golem_activity/__manifest__.py
index cd2b276..13ce61b 100644
--- a/golem_activity/__manifest__.py
+++ b/golem_activity/__manifest__.py
@@ -18,7 +18,7 @@
 {
     'name': 'GOLEM activities',
     'summary': 'Extends Odoo products for multi-activity',
-    'version': '10.0.2.1.1',
+    'version': '10.0.2.1.2',
     'category': 'GOLEM',
     'author': 'Fabien Bourgeois, Michel Dessenne',
     'license': 'AGPL-3',
diff --git a/golem_activity/models/golem_activity.py b/golem_activity/models/golem_activity.py
index 6fffefb..f9168ce 100644
--- a/golem_activity/models/golem_activity.py
+++ b/golem_activity/models/golem_activity.py
@@ -50,6 +50,16 @@ class GolemActivity(models.Model):
     is_fullseason = fields.Boolean('Is full season?',
                                    compute='_compute_is_full_season')
 
+    @api.onchange('is_fullseason')
+    def onchange_fullseason(self):
+        """ Sets dates as season ones if needed """
+        for activity in self:
+            if activity.is_fullseason:
+                if activity.season_id.date_start:
+                    activity.date_start = activity.season_id.date_start
+                if activity.season_id.date_end:
+                    activity.date_stop = activity.season_id.date_end
+
     @api.depends('date_start', 'date_stop')
     def _compute_is_full_season(self):
         """ Display date for is full season """