  We consider the minimal supersymmetric grand unified model (MSGUT) based on
the group $\mathrm{SO}(10)$, and study conditions leading to possible domain
wall (DW) formation. It has been shown earlier that the supersymmetry
preserving vacuum expectation values (vev's) get mapped to distinct but
degenerate set of vev's under action of $D$ parity, leading to formation of
domain walls as topological pseudo-defects. The metastability of such walls can
make them relatively long lived and contradict standard cosmology. Thus we are
led to consider adding a nonrenormalisable Planck scale suppressed operator,
that breaks $\mathrm{SO}(10)$ symmetry but preserves Standard Model symmetry.
For a large range of right handed breaking scales $M_R$, this is shown to give
rise to the required pressure difference to remove the domain walls without
conflicting with consistent big bang nucleosynthesis (BBN) while avoiding
gravitino overproduction. However, if the walls persist till the onset of weak
(thermal) inflation, then a low $\sim 10 - 100$ TeV $M_R$ becomes problematic.
