Creo ModelCHECK > config_init_options > DENSITY_MDLUPDOK
  
DENSITY_MDLUPDOK
<Y/N>
Updates the model density if it is not defined.
Y— Automatically updates the density of the model, to the default density, if you have not defined the density.
N— Choose an appropriate option to update the density of a model if you have not defined the density.