Could someone explain me why the following code:

                if ISession(self.request)['cdc_adama'].__contains__('current_customer'):
                        ISession(self.request)['cdc_adama'].__delitem__('current_customer')
                ISession(self.request)['cdc_adama']['current_customer'] = customer

  File "/home/simon/ADAMA/Src/gui/z3c_dunning/eggs/ZODB-4.0.0a4-py2.7.egg/ZODB/serialize.py", line 352, in persistent_id
    "database connection", self._jar, obj,
InvalidObjectReference: ('Attempt to store an object from a foreign database connection', <Connection at 7966348c>, <zope.container.btree.BTreeContainer object at 0x7a61282c>)

Is the zope.session module opening a new ZODB connection ?

Thanks for your explanation

Simon Elbaz