The unit code used has been marked for change in a future release so that will be prefixed with an X. As example code AE will become code XAE.
cbc:*/@unitCode( ( not(contains(normalize-space(.),' ')) and not(contains( ' 43 2W 4A AM AV BD BE BG BJ BK BL BO BR BT BX CA CH CJ CL CO CQ CR CS CT CU CV CY D97 DR EV JG JR KG MT NRL PA PF PG PK PL PU RD RG RL RO SA SL SO ST SV TK TN TU TY VI VQ Z2 Z3 Z4 ',concat(' ',normalize-space(.),' ') ) ) ) )