"The total peace cost of their provinces is too great"

[sTaz2o]

In my Knights -> Kingdom of Jerusalem attempt, I declared war on Cyprus and Venice sieged the province for me and transferred control. However, I'm unable to annex Cyprus.

Here's an image:
http://cloud-4.steampowered.com/ugc/28472540266787440/C9297356B88F25478BE41074D9575DC529AAA2BB/

Interestingly, I am able to vassalize them quite cheaply:
http://cloud-4.steampowered.com/ugc/28472540266859235/5FFEC3652630B08FCA59CF4068EB16D627EFC164/

Is this a bug or is there something about the mechanics of other countries transferring siege control that makes it impossible to annex?

EDIT: I was able to fully annex them only once Venice white peaced out of the war. Does that mean this is a bug?

 

[Lord Finnish]

Saw the same thing several times. Put that to the token release weirdness.

 

[Caracai]

I think it is because you do no longer get 100% from sieging a OPM when there are allies in the war.

The cost for full annex however is always 100%. The tooltip on the other hand is just bad and doesn't explain what's really going on

 

[sTaz2o]

But the option to full annex was greyed out completely until my ally white peaced out.

 

[Caracai]

Yeah, it's really confusing. But luckily you can now at least check what their total war score would be so you can know if you can ignore this weirdness

 

[BaZERGer]

- You can no longer get 100% warscore from just fully occupying warleader unless warleader is alone in the war OR war has been going on for at least 5 years

Once enough time has passed, the warscore should automaticaly jump to 100%, i believe their allies usualy are willing to white peace at that time as well.

 

[sTaz2o]

Once enough time has passed, the warscore should automaticaly jump to 100%, i believe their allies usualy are willing to white peace at that time as well.

Yes that's true but it has nothing to do with the option to full annex being completely greyed out while your ally is still in the war.