Creo ModelCHECK > start_config_options > Relation and Relation Comments
  
Relation and Relation Comments
Creo ModelCHECK can check for standard relations and comment lines when it runs. Use the following format in the start configuration file:
PRT_RELATION MASS=mp_mass("")
PRT_COMMENT Sets the mass parameter to the mass value
PRT_RELATION D12=5