Section 2(14)(v) in The Goa, Daman and Diu Secondary and Higher Secondary Education Rules, 1975
(v)In regard to books of Mathematics and Science the answers of all problems in each of such books approved for sanction shall be arranged to be checked by a Reviewer (ordinarily the one by whom the original review of the book was made) and in case of errors, it will be incumbent for the author or publisher to provide an errata to the book concerned.