diff --git a/addons/account/models/account_invoice.py b/addons/account/models/account_invoice.py
index 6684a486644..896e0ad5c3a 100644
--- a/addons/account/models/account_invoice.py
+++ b/addons/account/models/account_invoice.py
@@ -719,15 +719,6 @@ class AccountInvoice(models.Model):
         params.update(self.partner_id.signup_get_auth_param()[self.partner_id.id])
         return '/mail/view?' + url_encode(params)
 
-    @api.multi
-    def get_signup_url(self):
-        self.ensure_one()
-        return self.partner_id.with_context(signup_valid=True)._get_signup_url_for_action(
-            action='/mail/view',
-            model=self._name,
-            res_id=self.id)[self.partner_id.id]
-
-
     @api.multi
     def get_formview_id(self, access_uid=None):
         """ Update form view id of action to open the invoice """
diff --git a/addons/sale/models/sale.py b/addons/sale/models/sale.py
index e94144da796..274eaf43db2 100644
--- a/addons/sale/models/sale.py
+++ b/addons/sale/models/sale.py
@@ -608,14 +608,6 @@ class SaleOrder(models.Model):
 
         return groups
 
-    @api.multi
-    def get_signup_url(self):
-        self.ensure_one()
-        return self.partner_id.with_context(signup_valid=True)._get_signup_url_for_action(
-            action='/mail/view',
-            model=self._name,
-            res_id=self.id)[self.partner_id.id]
-
 
 class SaleOrderLine(models.Model):
     _name = 'sale.order.line'