Some question in events or scenarios.

I'm making an scenario and i want some lands to activate for some players in certain turns, before that, the lands are neutral with a huge defence. When i add one sigle unit of the player i want to give that country, i got the error that i can´t put different player units in a neutral cap.

However, i saw this in scenarios from Aetius and Tunder, What am i making wrong?

It's an advanced trick used only by the master map makers such as Adog, Tunder, Tik-Tok etc. There's a way around it, though. What you can do is give the event country a unit with huge defense but give it defense nerfs against another units. You put the second unit right outside of the event vountry, and the player has to capture it manually. Also this should be in the "scenario" forum.

Ok, thks, so in the scenario "Rome Political" from Aetius i saw it autoactivate and i still can't find how do it

I've also seen it in Pyrrhus' WW2 map, e.g. when USSR gets "economy boost" cites 1 per 1.