weird - invalid string enlargement request size

A simple query:

select prec.bl_considerada_prioritaria
AS "A proposta é considerada prioritária por Conselho Municipal ou Estadual"
from consultaprevia2008.tab_urb_asse_prec prec

The result: ERROR: invalid string enlargement request size 1073741823

But.. If i replace the accented char, leaving the query like:

select prec.bl_considerada_prioritaria
AS "A proposta e considerada prioritaria por Conselho Municipal ou Estadual"
from consultaprevia2008.tab_urb_asse_prec prec

More weird yet: This is part of a large query. I have the keyword
"as", using accented chars in some other places, and works ok.

My pg version:

"PostgreSQL 8.2.5 on x86_64-unknown-linux-gnu, compiled by GCC gcc
(GCC) 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)"

This is a restored backup from 8.1 . In 8.1 it works ok.

[]'s
- Walter