diff --git a/sale_fiscal_position_update_button/sale.py b/sale_fiscal_position_update_button/sale.py
index 1b2602b..7c31290 100644
--- a/sale_fiscal_position_update_button/sale.py
+++ b/sale_fiscal_position_update_button/sale.py
@@ -55,4 +55,4 @@ class sale_order(orm.Model):
                         _("Cannot update the fiscal position because "
                             "the line '%s' doesn't have a product.")
                         % line.name)
-        return {}
+        return True