I can confirm that breaking the client state relations (as a vassal) works both in MP and SP game, I broke the relation the same turn it came in effect and in the next turn i was free.

The only drawback is a relations hits with the master and all your previous relations with other states cancelled.

Hi People,
in an MP i made a mistake and sent a proposal to become myself client state of them instead of the inverse. I've already sent the turn, there's a way to reverse it?

Thanks.

Regards.

Greetings,
i've the same problem with Ptolemaios in an ongoing MP game.

I have as a Province a +4 in Infrastructure, but nothing is building.