I've created profiles:
* ziak - transfer limit 200 MiB;
* ucitel - transfer limit 1 GiB, changed to no limit later.

(btw, why userman is displaying Mib - mebibits and not MiB - mebibytes?)

I've created users using profile ziak, but there is no transfer limit for them.
But there is a user of profile ucitel, which has limit 1 GiB, despite the fact that I have cancel the limit to this profile.
Please look at the screenshots.

What's wrong? Is it working? I've tried this function few days before and it AFAIK it was working well.

on the profile, what active limitation constraint?, maybe you not yet activate the limitation there.

I think they are activated, see screenshot. Or what should I do to activate it?
I've created two more accounts of profile ziak - first has the transfer limit and the second one has not. It seems strange to me.

Well, problem is partially solved. After user log on, transfer limit is set to actual value of profile.
The only strange thing is, why some users has no limit after creating account and other has correct limit - but that doesn't bother me.