  We describe the construction of a suite of galaxy cluster mock catalogues
from N-body simulations, based on the properties of the new ROSAT-ESO
Flux-Limited X-Ray (REFLEX II) galaxy cluster catalogue. Our procedure is based
on the measurements of the cluster abundance, and involves the calibration of
the underlying scaling relation linking the mass of dark matter haloes to the
cluster X-ray luminosity determined in the \emph{ROSAT} energy band $0.1-2.4$
keV. In order to reproduce the observed abundance in the luminosity range
probed by the REFLEX II X-ray luminosity function ($0.01<L_{X}/(10^{44}{\rm
erg}\,{\rm s}^{-1}h^{-2})<10$), a mass-X ray luminosity relation deviating from
a simple power law is required. We discuss the dependence of the calibration of
this scaling relation on the X-ray luminosity and the definition of halo masses
and analyse the one- and two-point statistical properties of the mock
catalogues. Our set of mock catalogues provides samples with self-calibrated
scaling relations of galaxy clusters together with inherent properties of
flux-limited surveys. This makes them a useful tool to explore different
systematic effects and statistical methods involved in constraining both
astrophysical and cosmological information from present and future galaxy
cluster surveys.
