Transgression -- How? When?

[Quillan]

In the basic game it'll still happen even if you are allied with them. The act of the Julii becoming at war (no matter who declares it) with Spain will break all Spanish alliances with the other roman factions. As each faction takes it's turn, it will declare war with everyone against whom the Julii are at war. The only times I've seen this work differently are after the roman alliance is broken up by the civil war or one becoming outlawed, or in the base 1.3 patch version which broke the roman diplomacy. It was fixed again in the 1.5 patch. I don't have BI, but I'm pretty sure it's different there.

[GeneralHankerchief]

There are times where I wish you could issue your own transgression warnings. I remember in the early stages of my Macedonian game, the Brutii (whom I was on good relations with) started milling around Thermon and Bylazora. What was I to do?

Eventually, I did a simultaneous attack on all their armies in my area. After the damage is done, I -get this- receive a transgression warning- from the Julii.