diff --git a/account_advanced_reconcile_transaction_ref/account.py b/account_advanced_reconcile_transaction_ref/account.py
index 2e60c012..0525de31 100644
--- a/account_advanced_reconcile_transaction_ref/account.py
+++ b/account_advanced_reconcile_transaction_ref/account.py
@@ -27,7 +27,7 @@ class AccountMoveLine(Model):
     """
     _inherit = "account.move.line"
     _columns = {
-        'transaction_ref':fields.char('Transaction Ref.', size=128),
+        'transaction_ref': fields.char('Transaction Ref.', size=128),
     }
     
 class AccountBankSatement(Model):
diff --git a/account_advanced_reconcile_transaction_ref/advanced_reconciliation.py b/account_advanced_reconcile_transaction_ref/advanced_reconciliation.py
index e3683eca..50687d9c 100644
--- a/account_advanced_reconcile_transaction_ref/advanced_reconciliation.py
+++ b/account_advanced_reconcile_transaction_ref/advanced_reconciliation.py
@@ -40,5 +40,4 @@ class easy_reconcile_advanced_transaction_ref(orm.TransientModel):
   
     def _opposite_matchers(self, cr, uid, rec, move_line, context=None):
         yield ('partner_id', move_line['partner_id'])
-        yield ('ref', move_line['transaction_ref'] or ''.lower().strip())       
-
+        yield ('ref', (move_line['transaction_ref'] or '').lower().strip())