diff --git a/statement.py b/statement.py
index 923333e..4a35ace 100644
--- a/statement.py
+++ b/statement.py
@@ -373,13 +373,14 @@ class StatementLine(ModelView):
         "Real Cash", currency='currency', digits='currency')
     mismatch = Monetary(
         "Mismatch", currency='currency', digits='currency', readonly=True)
-    account = fields.Many2One('account.account', "Account",
-                              domain=[
-                                  ('company', '=', Eval('company', 0)),
-                                  ('type', '!=', None),
-                                  ('closed', '!=', True),
-                              ],
-                              states={'required': If(Eval('transfer', True), True)})
+    account = fields.Many2One(
+        'account.account', "Account",
+        domain=[
+            ('company', '=', Eval('company', 0)),
+            ('type', '!=', None),
+            ('closed', '!=', True),
+        ],
+        states={'required': Eval('transfer', True)})
 
     @staticmethod
     def default_currency():