Il 2 FMB Ships "Sleep" Question

[Racetrack]

I Guys! I go to the point..........
I want my "AssaultFleet" (made of some stationary warships) to start firing on a beach seven minutes after the game start. I've setted the "Sleep" of every ship on 7 minutes.... But they don't open fire for the entire match.. The simply stay there with guns in defalut positions... Maybe they'll start fire after underattack?

I tried the same thing for the coast artillery defenses by setting the "TimeOut" options and it worked perfectly.

Help!