431 and 531 are used for "see also" forms of uniform titles, instead of 430 and 530 Chronological Term (new 2002) : 148, 448, 548 and Medium of Performance Term (new 2013) : 162, 462, 562 are not indexed in record.abs (and probably DOM conf files) for MARC21 authorities. See also forms subdivision headings (180-185) are not indexed Notes are not indexed M. Saby
I'm wrong for 148-448-548 fields. They are indexed.