diff --git a/golem_activity_session_registration/models/golem_activity_session_registration.py b/golem_activity_session_registration/models/golem_activity_session_registration.py
index 4e5db47..6c6aaeb 100644
--- a/golem_activity_session_registration/models/golem_activity_session_registration.py
+++ b/golem_activity_session_registration/models/golem_activity_session_registration.py
@@ -63,6 +63,9 @@ class GolemActivitySessionRegistration(models.Model):
     _name = 'golem.activity.session.registration'
     _description = 'GOLEM Activity Session Registration'
 
+    state = fields.Selection([('draft', 'Draft'), ('confirmed', 'Confirmed'),
+                              ('canceled', 'Canceled')], required=True,
+                             default='draft')
     member_id = fields.Many2one('golem.member', string='Member', required=True,
                                 ondelete='cascade')
     session_id = fields.Many2one('golem.activity.session', required=True,
diff --git a/golem_activity_session_registration/views/golem_activity_session_registration_view.xml b/golem_activity_session_registration/views/golem_activity_session_registration_view.xml
index 0c7f581..e0e6e5b 100644
--- a/golem_activity_session_registration/views/golem_activity_session_registration_view.xml
+++ b/golem_activity_session_registration/views/golem_activity_session_registration_view.xml
@@ -40,7 +40,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
       <field name="name">Session registration list</field>
       <field name="model">golem.activity.session.registration</field>
       <field name="arch" type="xml">
-        <tree create="true" edit="false" delete="false" editable="top">
+        <tree create="true" edit="false" delete="false" editable="top"
+          colors="red: state == 'canceled';grey: state == 'draft';">
+          <field name="state" invisible="1" />
           <field name="season_id" readonly="1" />
           <field name="member_id" domain="[('is_current', '=', True)]" />
           <field name="session_id" domain="[('is_current', '=', True)]" />
diff --git a/golem_activity_session_registration/views/golem_activity_view.xml b/golem_activity_session_registration/views/golem_activity_view.xml
index b82e68b..a2d6a24 100644
--- a/golem_activity_session_registration/views/golem_activity_view.xml
+++ b/golem_activity_session_registration/views/golem_activity_view.xml
@@ -33,7 +33,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
               <field name="places_remain" readonly="True" />
               <field name="activity_session_registration_ids"
                 context="{'default_session_id': active_id}">
-                <tree editable="top">
+                <tree editable="top"
+                  colors="red: state == 'canceled';grey: state == 'draft';">
+                  <field name="state" invisible="1" />
                   <field name="member_id"
                     domain="[('season_ids', '=', season_id)]" />
                   <field name="session_id" readonly="1" />
diff --git a/golem_activity_session_registration/views/golem_member_view.xml b/golem_activity_session_registration/views/golem_member_view.xml
index c40be01..cbe2691 100644
--- a/golem_activity_session_registration/views/golem_member_view.xml
+++ b/golem_activity_session_registration/views/golem_member_view.xml
@@ -29,7 +29,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
             <p>Default season activities</p>
             <field name="activity_session_registration_ids"
               context="{'default_member_id': active_id}">
-              <tree editable="top">
+              <tree editable="top"
+                colors="red: state == 'canceled';grey: state == 'draft';">
+                <field name="state" invisible="1" />
                 <field name="session_id"
                   domain="[('is_current', '=', True)]" />
                 <field name="season_id" readonly="1" />