The works Sefer Mitzvos Gadol and Sefer Mitzvos Katan have very similar names, but I never assumed the connection went far beyond that.
Then, I saw a Beis Yosef (Yoreh Deah 194) which, in explanation of an omission of the Sefer Mitzvos Katan, says that he depended on the fact that the Sefer Mitzvos Gadol mentioned it.
What is the relationship between the two works such that one would rely on being understood in the context of what is said by the other?