Can't join Jihad. What am I missing

[Darrigan]

I've psoted this in the bug reports section earlier, but I'm not sure if it actually is a bug.

This is my first time as a non-independent muslim. The Caliph just called for a Jihad against Greece, which I wanted to join. However, the game tells me I can't becaus the Seljuk (Persian) crown laws restrics me from waging war against another vassal... That would all be fine with me if Greece wasn't controlled by the Byzantine Emperor, which - you guessed it - is not a vassal of my Seljuk overlord. Is this WAD or simply a bug? If it's the former: What am I missing here?

Here's a screenshot:

Spoiler

I'm a Syrian sheikh of 3 provinces and a vassal of Mosul, which is a vassal of the Seljuks. I'm playing the latest version of the SWMH mod for CK2 1.08. SWMH does only affect the map, and should not affect any other aspects of the game.

 

[unmerged(462833)]

You are a vassal of Seljuk - and he joined Jihad. Result is simply - You are at war with Byzantine. You can't join war for the same reason...

 

[Darrigan]

Then why does it tell me "Crown Laws don't allow to wage war on other vassals"? And why are the Catholics allowed to join a Crusade their top liege is already on?
(They started one for Jerusalem, and I switched to some count in England - High CA - while England is already in the crusade. As the count I could still join the Crusade, if I wanted to.)

 

[Ordo Impavidus]

Simply, Islam didn't follow the same political structure and rules as their heathen counterparts, whom I affectionately call "The Legion." This is where this game misses the mark. Allah's will was the common mode of law, not man-made bureaucracy.