OK, thanks, maybe a problem with upgrade.
with version 5.1.2 I didn't have problem using the way listed in the contributed how to, but upgrading to 5.5 this method does not work and is advised in the page.
Biggest problems in e-smith are always the upgrades, I don't know an upgrade without problems. I don't recommend upgrading to 5.5 from my point of view since webmail has problems, and manager works very slow, I'll try a fresh installation instead ...if I get time to do it!.
If your system is customized even a little there are always problems upgrading.
Thank you all
when I do the fresh install I'll tell you.