There are documents other than Nika Sojo such as 'Hyaku Rokka Sho' (One Hundred and Six Articles, also known as Kechimyakusho) and 'Honinmyosho' (Honin-myo Sho (On the Mystic Principle of the Original Cause, also known as Hokkehonmonshu Kechimyakusojonokoto (document about the inheritance of blood lineage in Hokke Honmon Sect)), which are also called Ryokan Kechimyaku (blood lineage of two books), but both are criticized by other sects within Nichiren sects that they are fake books.
二箇相承以外にも、両巻血脈といわれる「百六箇抄（血脈抄）」「本因妙抄（法華本門宗血脈相承事）」などがあるが、いずれも同門他派からは疑義の強い書として批判されている。