Use "Sb.m.s." for a later treaty

Error²Federal courts, Illinois courts21st and 22nd editions

Czech treaties promulgated in 2000 or later are published in a separate collection from earlier ones, under that collection's own abbreviation.¹

1. 1T2.11 Czechia.
2. 2An error: the rule in note 1 allows one form, and this is not it.