Stored procedures returning cursors

I was trying to call a procedure returning a "ref cursor" in a
PostgreSQL database. It works with psycopg2 2.3.2, but not with 2.4.4.

My code looks like this:
http://osdir.com/ml/python.db.psycopg.devel/2005-10/msg00116.html

The result is a "cursor <unnamed portal 1> doesn't exists"
How I can do it in the right way?

Thanks!

--
Rodolfo

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