  We study effects related to violation of energy-momentum conservation
inherent to the BFKL approach, in the particular case of Mueller-Navelet jets
production. We argue, based on the comparison of the lowest order non trivial
corrections $\mathcal{O}(\alpha_s^3)$ to the cross section with predictions of
an exact calculation, that the inclusion of next-to-leading order BFKL
corrections to the jet production vertex significantly reduces the importance
of these effects.
