Found problem : in sessions/addon/ses.kfs open spells.txt file and in magic_bondage = magic shackles there is nfeatures list of units imune to this effect and it goes
nfeatures=mind_immunity, magic_immunity , pawn , boss
which means units immune to mind spells cant be shackled and all undead are immune to those spells. Remove mind_immunity part of string there and whoala necros can be shackled, problem solved. Have fun
