So, just to recap, that Afghan pea accession with resistance to a couple of different strains of Peronospora viciae (which causes downy mildew):
PS 998 = WBH 2126 (Plant Breeding Institution, Weibullsholm, Landskrona) = NGB 102126 = ATC 2432 (Australian Temperate Field Crops Collection, Horsham) = PI 222117 sel.
Thanks to Jenny Davidson, Dirk Enneking, Tony Leonforte, Bob Redden and assorted databases for helping to sort that one out.