Conflicting Wargoals

The types of casus bellis are in ..\common\cb_types\00_cb_types.txt. There is a flag hostile_against_others that is set for certain CBs and not others. It's not clear to me the exact functionality of this, but the only description I could find states that this flags hostility to all other combatants.

So if the game wants to consider multiple same-religion holy wars to be not conflicting (which makes sense), there is no way for it to consider differing religion holy wars to be conflicting either.

The CB types it is set for are:

• claims
• dejure claims
• invasions
• generated revolts (peasant/etc)
• subjugations/conquests
• buddhist holy wars (and only these guys)

Not sure why buddhists are different from the rest.

It's pretty straight forward.

In the first case, you declare war on "County", because you have a claim to press. As does the HRE. Your specific war goal is that you both want the county for yourself. Of course, only one of you can achieve that goal, so naturally there is a conflict here. Had you joined their war, you would have fought for their cause – regardless of your claim/claimants in your court.

In the second case, both you and the Byzantine Empire agreed that "Country" needed to be taught a serious lesson. Your war goals are not at conflict, thus you remain neutral/friendly to eachother, as you are working towards the same end.

Simply put, if you are declaring war for a title, you will be hostile to anyone with an ongoing dispute for that title. Should someone else win their dispute and achieve their war goal, all other disputes for that title will automatically end.