in 0.6.1 in my case it was because:
1)  i create an instance,
2) save it
3) delete it
4) change it**
5) again save it

if i skip 4) and go to 5 its OK
or if use update as 5) instead of save() its again OK

On 15 Юли, 17:06, Iskren Stanislavov <[email protected]> wrote:
> Hi, Jose! Hello sa-team!
>
> I have the same question... did you got the solution?
> p.s.
> I use SA 0.6.1
>  i will post a test example if needed
>
> thanks in advance,
> Iskren
>
> On 19 Май, 10:32, jose soares <[email protected]> wrote:
>
> > Hi all,
>
> > Someone knows what this error mean?
> > ...
>
> >   File 
> > "/home/ve/sfera/release/sicer/BASE/model/anagraficaAlta/unita_aziendale.py",
> >  line 154, in aggiorna_capi_bovini
> >     x.flush()
> >   File 
> > "/home/ve/lib/python2.5/site-packages/SQLAlchemy-0.3.10-py2.5.egg/sqlalchemy/ext/assignmapper.py",
> >  line 20, in do
> >     return getattr(session, name)(self, *args, **kwargs)
> >   File 
> > "/home/ve/lib/python2.5/site-packages/SQLAlchemy-0.3.10-py2.5.egg/sqlalchemy/orm/session.py",
> >  line 319, in flush
> >     self.uow.flush(self, objects)
> >   File 
> > "/home/ve/lib/python2.5/site-packages/SQLAlchemy-0.3.10-py2.5.egg/sqlalchemy/orm/unitofwork.py",
> >  line 210, in flush
> >     flush_context.execute()
> >   File 
> > "/home/ve/lib/python2.5/site-packages/SQLAlchemy-0.3.10-py2.5.egg/sqlalchemy/orm/unitofwork.py",
> >  line 400, in execute
> >     UOWExecutor().execute(self, head)
> >   File 
> > "/home/ve/lib/python2.5/site-packages/SQLAlchemy-0.3.10-py2.5.egg/sqlalchemy/orm/unitofwork.py",
> >  line 1020, in execute
> >     self.execute_delete_steps(trans, task)
> >   File 
> > "/home/ve/lib/python2.5/site-packages/SQLAlchemy-0.3.10-py2.5.egg/sqlalchemy/orm/unitofwork.py",
> >  line 1043, in execute_delete_steps
> >     self.delete_objects(trans, task)
> >   File 
> > "/home/ve/lib/python2.5/site-packages/SQLAlchemy-0.3.10-py2.5.egg/sqlalchemy/orm/unitofwork.py",
> >  line 1026, in delete_objects
> >     task.mapper.delete_obj(task.polymorphic_todelete_objects, trans)
> >   File 
> > "/home/ve/lib/python2.5/site-packages/SQLAlchemy-0.3.10-py2.5.egg/sqlalchemy/orm/mapper.py",
> >  line 1322, in delete_obj
> >     raise exceptions.ConcurrentModificationError("Updated rowcount %d does 
> > not match number of objects updated %d" % (c.rowcount, len(delete)))
>
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