  It is shown that causality violations [M. de Haan, Physica 132A, 375, 397
(1985)], emerging when the conventional definition of the time-normal operator
ordering [P.L.Kelley and W.H.Kleiner, Phys.Rev. 136, A316 (1964)] is taken
outside the rotating wave approximation, disappear when the amended definition
[L.P. and S.S., Annals of Physics, 323, 1989 (2008)] of this ordering is used.
