In addition, it is likely to be a forgery by later generations because the "Honcho shojaku mokuroku" (Catalogue of Books in Japan, the oldest known work of its type) describes it as 'Tensho, in ten volumes' and 'compiled by Dainagon FUJIWARA no Hamanari.'
また、『本朝書籍目録』に「天書十巻」「大納言藤原浜成撰」とあることからの、後世の偽書であろう。