Hi,

>I do a session.clear(), all time, after of
>session.save_or_update([obj])
>Can this be the problem?
>  
>
That is almost certainly your problem. Try removing the session.clear() 
and see if it then works.

>When is advisable do a session.clear() ?
>  
>
When you're done with a batch of processing. In web applications this 
fits nicely at the end of a request.

Paul

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