  The origin of the inner Galactic emission, measured by COMPTEL with a flux of
$\sim 10^{-2} ~{\rm MeV~ cm}^{-2}~ {\rm s}^{-1}~ {\rm sr}^{-1}$ in the 1-30 MeV
energy range from the inner Galactic region, has remained unsettled since its
discovery. In this paper, we elaborate on a model of individual MeV gamma-ray
sources unresolved by COMPTEL. This is conducted for sources crossmatched
between the Swift-BAT and Fermi-LAT catalogs by interpolating the energy
spectra in the hard X-ray and GeV gamma-ray ranges, as well as unmatched
sources between the two catalogs. We find that the source contribution to the
COMPTEL emission would be at least ~20%. Combined with the Galactic diffuse
emission, which is not well constrained, the COMPTEL emission can be roughly
reproduced in some cases.
