There are some errors in Theorems 3.3 and 4.2 in [2]. In this note we would like to correct them.
1) In Theorem 3.3 (and [IV]), the condition (1) must be replaced by the following one;
(1) П is (i) a cyclic group, (ii) a dihedral group of order 2m, m odd, (iii) a direct product of a cyclic group of order qf, q an odd prime, f ≧ 1, and a dihedral group of order 2m, m odd, where each prime divisor of m is a primitive qf-1(q — 1)-th root of unity modulo qf, or (iv) a generalized quaternion group of order 4m, m odd, where each prime divisor of m is congruent to 3 modulo 4.