diff -r a72adec69419 -r e9e71b24f431 src/pyams_scheduler/zmi/zodb.py
--- a/src/pyams_scheduler/zmi/zodb.py	Wed Mar 28 16:02:34 2018 +0200
+++ b/src/pyams_scheduler/zmi/zodb.py	Wed Apr 11 11:37:21 2018 +0200
@@ -71,6 +71,8 @@
 class ZODBTaskEditForm(AdminDialogEditForm):
     """ZODB packing task edit form"""
 
+    prefix = 'zodb_settings.'
+
     @property
     def title(self):
         translate = self.request.localizer.translate