diff --git a/event_generate_quotation_from_registration/models/event_registration.py b/event_generate_quotation_from_registration/models/event_registration.py
index f862595..ec7e575 100644
--- a/event_generate_quotation_from_registration/models/event_registration.py
+++ b/event_generate_quotation_from_registration/models/event_registration.py
@@ -36,8 +36,9 @@ class EventRegistration(models.Model):
                     financier.quotation_id = sale_order
                 else:
                     order_lines = self.env['sale.order.line'].search([
-                        ('order_id','=',financier.quotation_id.id), 
-                        ('product_id','=',financier.get_product_id())
+                        ('order_id','=',financier.quotation_id.id),
+                        ('product_id','=',financier.get_product_id()),
+                        ('state', '!=', 'done'),
                     ])
                     if order_lines:
                         order_lines[0].price_unit = financier.amount
diff --git a/event_generate_quotation_from_registration/models/event_registration_financier.py b/event_generate_quotation_from_registration/models/event_registration_financier.py
index 67dce93..6299dae 100644
--- a/event_generate_quotation_from_registration/models/event_registration_financier.py
+++ b/event_generate_quotation_from_registration/models/event_registration_financier.py
@@ -17,6 +17,10 @@ class EventRegistrationFinancier(models.Model):
     financier_id = fields.Many2one('res.partner', string="Financeur", required=True)
     terms = fields.Char('Modalités')
     amount = fields.Monetary('Montant', currency_field="company_currency_id")
+    state = fields.Selection(
+        related='quotation_id.state',
+        string="Order Status",
+        copy=False, store=True, precompute=True)
 
 
     def get_product_id(self):
diff --git a/event_generate_quotation_from_registration/views/event_registration_views.xml b/event_generate_quotation_from_registration/views/event_registration_views.xml
index b8eebd6..095df3b 100644
--- a/event_generate_quotation_from_registration/views/event_registration_views.xml
+++ b/event_generate_quotation_from_registration/views/event_registration_views.xml
@@ -10,9 +10,10 @@
                 <group name="quotation" string="Financement" colspan="1">
                     <field name="financier_ids" nolabel="1" colspan="2">
                         <tree editable="bottom">
-                            <field name="financier_id" />
-                            <field name="amount" />      
-                            <field name="terms" />                      
+			    <field name="state" invisible="1"/>
+			    <field name="financier_id" attrs="{'readonly': [('state', 'in', ['done', 'cancel'])]}"/>
+                            <field name="amount" attrs="{'readonly': [('state', 'in', ['done', 'cancel'])]}" />
+			    <field name="terms" />
                             <field name="quotation_id" readonly="True" />
                         </tree>
                     </field>