  It is found that UrQMD model version 3.3 does not describe NA61/SHINE
Collaboration data on \pi-meson production in pp interactions at energies 20 -
80 GeV. At the same time, it describes quite well the NA49 Collaboration data
on the meson production in pp and pC interactions at 158 GeV. The
Collaborations do not consider feedback of \eta-meson decays. All versions of
the UrQMD model assume that \eta-mesons are "stable". An inclusion of the
decays into calculations leads to 2--3 % increase of the meson production which
is not enough for description of the data. Possible ways of the model
improvements are considered.
  Conclusions of the paper are: accounting of \eta-meson decays is not
essential for a description of experimental data; a new tuning of the UrQMD
model parameters is needed for a successful description of pp and pC
interactions at high energies; inclusion of the low mass diffraction
dissociation in the UrQMD model would be desirable.
