  We present the effect of the quantum corrections on the Szekeres spacetime, a
system important for the study of the inhomogeneities of the pre-inflationary
era of the universe. The study is performed in the context of canonical
quantisation in the presence of symmetries. We construct an effective classical
Lagrangian and impose the quantum version of its classical integrals of motion
on the wave function. The interpretational scheme of the quantum solution is
that of Bohmian mechanics, in which one can avoid the unitarity problem of
quantum cosmology. We discuss our results in this context.
