diff --git a/addons/account/account_bank_statement.py b/addons/account/account_bank_statement.py
index 57472e228ef..85d9805eb32 100644
--- a/addons/account/account_bank_statement.py
+++ b/addons/account/account_bank_statement.py
@@ -30,10 +30,12 @@ class account_bank_statement(osv.osv):
     def create(self, cr, uid, vals, context=None):
         seq = 0
         if 'line_ids' in vals:
+            new_line_ids = []
             for line in vals['line_ids']:
                 seq += 1
                 line[2]['sequence'] = seq
-                vals[seq - 1] = line
+                new_line_ids += tuple(line)
+            vals['line_ids'] = new_line_ids
         return super(account_bank_statement, self).create(cr, uid, vals, context=context)
 
     def write(self, cr, uid, ids, vals, context=None):