predictive mode and 'ã'

[weber]

Hello folks.
I'm trying to start using predictive and have this annoying problem.
It looks like predictive considers portuguese characters like ã or ó
as end-of-word characters (I have to type them pressing ~ then a,
maybe that's a problem?)

Here's the situation: when I type 'n', predictive suggests '(0) nil'.
If I continue typing 'não' , I end up getting 'nilão'. The nil is
inserted...

Anyone can help me?
Many thanks,
weber