--- a/src/pyams_alchemy/zmi/engine.py	Thu Mar 22 15:02:15 2018 +0100
+++ b/src/pyams_alchemy/zmi/engine.py	Tue Apr 10 15:19:56 2018 +0200
@@ -106,6 +106,8 @@
 class AlchemyEnginePropertiesEditForm(AdminDialogEditForm):
     """SQLAlchemy engine properties edit form"""
 
+    prefix = 'engine_properties.'
+
     @property
     def title(self):
         translate = self.request.localizer.translate