Forum adverts like this one are shown to any user who is not logged in. Join us by filling out a tiny 3 field form and you will get your own, free, dakka user account which gives a good range of benefits to you: No adverts like this in the forums anymore. Times and dates in your local timezone. Full tracking of what you have read so you can skip to your first unread post, easily see what has changed since you last logged in, and easily see what is new at a glance. Email notifications for threads you want to watch closely. Being a part of the oldest wargaming community on the net. If you are already a member then feel free to login now.

Daemon Princes of Chaos from the Daemons Codex have the DAEMON PRINCE OF CHAOS keyword, and I can't find anything that says they've ever had an errata to give them DAEMON PRINCE.

So RAW, you can take as many of them as you like in the same Detachment as Be'lakor.

Only CSM Daemon Princes (and some named characters) have DAEMON PRINCE as a keyword.

Does anyone have any source that says different?

I think that works for now, RAW -wise until FAQ'ed or new Daemon codex.

The intent is obvious though, so I wouldn't make purchases with the idea of slamming 3 DP along with Be'lakor's Army of Renown.