Added after 34 minutes
In short, I figured it out; I should have paid attention to the object type right away; the whole problem was in that. I recreated the object with the "Static" type, and now it works ;) (and I was foolishly starting to think that the command wasn't working).
Multiplayer: Господство, Извечное противостояние, Война за Магию, Торговая империя, Анатомия войны, Эксперимент
SingleScenario: Последний Рубеж, Трон, Элиралис, Вернуться домой!, Лабиринты разума
Campaign: Колонизация