  We have calculated diffractive dijet production in deep-inelastic scattering
(DIS) at low-Q^2 and next-to-leading order (NLO) of perturbative QCD, including
contributions from direct and resolved photons. We study how the cross section
depends on the factorization scheme and scale M_\gamma at the virtual photon
vertex for the occurance of factorization breaking. The strong
M_\gamma-dependence, which is present when only the resolved cross section is
suppressed, is tamed by intodrucing the suppression also in the initial-state
NLO correction of the direct part.
