  The restoration of the parity symmetry has been performed in the framework of
the Highly Truncated Diagonalization Approach suited to treat correlations in
an explicitly particle-number conserving microscopic approach. To do so we have
assumed axial symmetry and used a generalized Wick's theorem due to L\"owdin in
a projection-after-variation scheme. We have chosen the Skyrme SkM$^*$
energy-density functional for the particle-hole channel and a
density-independent delta force for the residual interaction. We have applied
this approach in the region of the outer fission barrier of the $^{240}$Pu
nucleus. As a result, we have shown that the $K^{\pi} = 0^+$ fission isomeric
state is statically unstable against intrinsic-parity breaking modes, while the
projection does not affect the energy at the top of the intrinsic outer fission
barrier. Altogether, this leads to an increase of the height of the outer
fission barrier--with respect to the fission isomeric state--by about 350 keV,
affecting thus significantly the fission-decay lifetime of the considered
fission isomer.
