As from 1 January 2009, publication codes ("kind of publication codes") used in order to distinguish PCT international applications published by the International Bureau of WIPO will be modified.
PCT international applications republished with alterations, amendments, corrections or supplements will be specifically distinguished from other documents by additional publication codes not previously used. The purpose of this change is to improve the usability of published PCT data and documents by more clearly identifying reasons for republication of PCT international applications.
Changes in publication codes will be reflected in all PCT international applications published or republished by the International Bureau on or after 1 January 2009. PCT international applications published or republished before that date will not be affected and will retain their original publication codes.
Additional information is to be found on WIPO's website http://www.wipo.int/patentscope/en/wo_publication_information/#2 .