  Polarisation observables constitute a powerful tool for establishing the
production mechanism of the eta meson and for infering the presence of higher
partial waves in the final system. Measurements of the proton analysing power
for the p(pol)p-->ppeta reaction have been performed by the COSY-11 group at
three different excess energies: Q=10, 37 and 40 MeV. Data at Q=40 MeV indicate
that the eta meson is probably produced in partial waves higher than s wave.
