diff --git a/golem_activity_registration_custom_price/__manifest__.py b/golem_activity_registration_custom_price/__manifest__.py
index b3c7d92..c84a32e 100644
--- a/golem_activity_registration_custom_price/__manifest__.py
+++ b/golem_activity_registration_custom_price/__manifest__.py
@@ -24,7 +24,7 @@
     - allow set price per area and slice ;
     - computes automatically applicable price ;
     - anticipate ruleset to be implemented for computing.''',
-    'version': '10.0.0.1.1',
+    'version': '10.0.0.1.2',
     'category': 'GOLEM',
     'author': 'Fabien Bourgeois',
     'license': 'AGPL-3',
diff --git a/golem_activity_registration_custom_price/models/golem_activity.py b/golem_activity_registration_custom_price/models/golem_activity.py
index d4ee2ee..f2cd473 100644
--- a/golem_activity_registration_custom_price/models/golem_activity.py
+++ b/golem_activity_registration_custom_price/models/golem_activity.py
@@ -24,7 +24,8 @@ class GolemActivity(models.Model):
     _inherit = 'golem.activity'
 
     price_line_ids = fields.One2many('golem.activity.price.line',
-                                     'activity_id', string='Price lines')
+                                     'activity_id', string='Price lines',
+                                     copy=True)
 
     @api.multi
     def reset_price_combinations(self):