  We discuss the scaling relation between mass and integrated Compton parameter
of a sample of galaxy clusters from the all-sky {\it Planck} Sunyaev-Zel'dovich
catalogue. Masses were measured with either weak lensing, caustics techniques,
or assuming hydrostatic equilibrium. The retrieved $Y_{500}$-$M_{500}$ relation
does not strongly depend on the calibration sample. We found a slope of
1.4-1.9, in agreement with self-similar predictions, with an intrinsic scatter
of $20\pm10$ per cent. The absolute calibration of the relation can not be
ascertained due to systematic differences of $\sim$20-40 per cent in mass
estimates reported by distinct groups. Due to the scatter, the slope of the
conditional scaling relation, to be used in cosmological studies of number
counts, is shallower, $\sim$1.1-1.6. The regression methods employed account
for intrinsic scatter in the mass measurements too. We found that Planck mass
estimates suffer from a mass dependent bias.
