diff --git a/l10n_it_ddt/wizard/ddt_create_invoice.py b/l10n_it_ddt/wizard/ddt_create_invoice.py
index d6e625613668..ce7eff469dd7 100644
--- a/l10n_it_ddt/wizard/ddt_create_invoice.py
+++ b/l10n_it_ddt/wizard/ddt_create_invoice.py
@@ -135,6 +135,7 @@ def create_invoice(self):
             'view_id': False,
             'views': [(tree_id, 'tree'), (form_id, 'form')],
             'type': 'ir.actions.act_window',
-            'domain': "[('type', '=', 'out_invoice'), ('id','in', [" + ','.join(
-                map(str, invoice_list)) + "])]",
+            'domain': "[('type', '=', 'out_invoice'),"
+                      " ('id','in', [" + ','.join(map(str, invoice_list)) +
+                      "])]",
         }