Sur une erreur dans les EGA
  A mistake is pointed out in EGA I, Elements of algebraic geometry, concerning corollary (2.4.4) which is not correct. Quite likely, the hitch has already been noticed, and reported, but we know not who, nor where. New research is recommended to find out if the error has spread or not, in the book and, further, in the literature. 
Labib Haddad
math.AG