I wrote: L'aleih ulkaleis is in Shabbos and YT davening before Yishtabach, but it was aiui yanked from some versions of Kaddish.» See BAER p 130 "v'yiskalei"s «Hosif alav ibn yarchi - shelo l'omro shelo l'hachria bishvach [or b'shevach] habborei Ayyain Sham Also see Maseches Sofrim 14:12 as cited by Baer Shalom and Regards, RRW