diff -r 1121fd3d8b0e -r 604b887e70c3 src/hdalab/services.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hdalab/services.py	Thu Feb 26 10:33:10 2015 +0100
@@ -0,0 +1,17 @@
+# -*- coding: utf-8 -*-
+'''
+Created on Feb 22, 2015
+
+@author: ymh
+'''
+from django.db import transaction
+from hdalab.models.renkan import HdalabRenkanStateTransition
+
+@transaction.atomic
+def change_renkan_state(hda_renkan, state, message=None, author=None):
+    
+    if state != hda_renkan.state:
+        
+        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