diff --git a/golem_activity/models/golem_activity.py b/golem_activity/models/golem_activity.py
index 8bf7ec9..2f75994 100644
--- a/golem_activity/models/golem_activity.py
+++ b/golem_activity/models/golem_activity.py
@@ -32,6 +32,9 @@ class GolemActivity(models.Model):
     _inherits = {'product.template': 'product_id'}
     _rec_name = 'activity_name'
 
+    product_id = fields.Many2one('product.template', required=True,
+                                 ondelete='cascade')
+
     # Copy the default code
     default_code = fields.Char(copy=True)
 
diff --git a/golem_member/models/golem_member.py b/golem_member/models/golem_member.py
index 88bb935..f8fc7c2 100644
--- a/golem_member/models/golem_member.py
+++ b/golem_member/models/golem_member.py
@@ -49,6 +49,9 @@ class GolemMember(models.Model):
     _inherit = 'mail.thread'
     _inherits = {'res.partner': 'partner_id'}
 
+    partner_id = fields.Many2one('res.partner', required=True,
+                                 ondelete='cascade')
+
     @api.model
     def _default_season(self):
         """ Get default season """