  It is well known that the Jacobi operators completely determine the curvature
tensor. The question of existence of a curvature tensor for given Jacobi
operators naturally arises, which is considered and solved in the previous
work. Unfortunately, although the published theorem is correct, its proof is
incomplete because it contains some omissions, and the aim of this paper is to
present a complete and accurate proof. We also generalize the main theorem to
the case of indefinite scalar product space. Accordingly, we generalize the
proportionality principle for Osserman algebraic curvature tensors.
