diff -r 65fc0c646d74 -r df8b3b49e81c src/hdalab/services.py
--- a/src/hdalab/services.py	Fri Feb 27 02:27:31 2015 +0100
+++ b/src/hdalab/services.py	Sat Feb 28 06:40:48 2015 +0100
@@ -4,9 +4,15 @@
 
 @author: ymh
 '''
+import logging
+
 from django.db import transaction
+
 from hdalab.models.renkan import HdalabRenkanStateTransition
 
+
+logger = logging.getLogger(__name__)
+
 @transaction.atomic
 def change_renkan_state(hda_renkan, state, message=None, author=None):
     
@@ -14,4 +20,5 @@
         
         HdalabRenkanStateTransition.objects.create(renkan=hda_renkan, from_state=hda_renkan.state, to_state=state, message=message, author=author)
         hda_renkan.state = state
-        hda_renkan.save()
\ No newline at end of file
+        hda_renkan.save()
+