diff --git a/CHANGELOG b/CHANGELOG
index 909b4eb..ae81dbb 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1 +1,2 @@
+Version 3.4.0 - 2015-01-22
 * Initial release
diff --git a/farm.py b/farm.py
index 7bf7b68..7a37397 100644
--- a/farm.py
+++ b/farm.py
@@ -170,7 +170,7 @@ class CreateBreeding(Wizard):
             breeding_group.save()
 
         breeding_account.name = breeding_group.number
-        breeding_account.animal_groups.append(breeding_group.id)
+        breeding_account.animal_groups += (breeding_group.id,)
         breeding_account.save()
 
         setattr(self.start.location,
diff --git a/tests/test_farm_breeding.py b/tests/test_farm_breeding.py
index 16b1136..18db81f 100644
--- a/tests/test_farm_breeding.py
+++ b/tests/test_farm_breeding.py
@@ -1,20 +1,9 @@
-#!/usr/bin/env python
 # The COPYRIGHT file at the top level of this repository contains the full
 # copyright notices and license terms.
-import sys
-import os
-DIR = os.path.abspath(os.path.normpath(os.path.join(__file__,
-    '..', '..', '..', '..', '..', 'trytond')))
-if os.path.isdir(DIR):
-    sys.path.insert(0, os.path.dirname(DIR))
-
 import unittest
-# TODO: Remove if no sceneario needed
-# import doctest
+
 import trytond.tests.test_tryton
 from trytond.tests.test_tryton import test_view, test_depends
-# TODO: Remove if no scenario needed
-# from trytond.backend.sqlite.database import Database as SQLiteDatabase
 
 
 class TestCase(unittest.TestCase):
@@ -38,25 +27,7 @@ class TestCase(unittest.TestCase):
         test_depends()
 
 
-# TODO: Remove if no scenario needed
-# def doctest_dropdb(test):
-#     database = SQLiteDatabase().connect()
-#     cursor = database.cursor(autocommit=True)
-#     try:
-#         database.drop(cursor, ':memory:')
-#         cursor.commit()
-#     finally:
-#         cursor.close()
-
-
 def suite():
     suite = trytond.tests.test_tryton.suite()
     suite.addTests(unittest.TestLoader().loadTestsFromTestCase(TestCase))
-    # TODO: Remove if no scenario needed
-    #suite.addTests(doctest.DocFileSuite('scenario_invoice.rst',
-    #        setUp=doctest_dropdb, tearDown=doctest_dropdb, encoding='utf-8',
-    #        optionflags=doctest.REPORT_ONLY_FIRST_FAILURE))
     return suite
-
-if __name__ == '__main__':
-    unittest.TextTestRunner(verbosity=2).run(suite())
diff --git a/tryton.cfg b/tryton.cfg
index 99dffac..03811f4 100644
--- a/tryton.cfg
+++ b/tryton.cfg
@@ -1,5 +1,5 @@
 [tryton]
-version=3.0.0
+version=3.4.0
 depends:
     analytic_account
     analytic_line_state