the three above mentioned config options seem to be somewhat redundant as pro_unit_sys includes definitions for length and mass. So my question comes down to this: Why do you need pro_unit_length and pro_unit_mass when you have pro_unit_sys?
Just note: If you use model template then these options are not used by Creo. Everything is saved in template.
thank you again. Now that you mention it I remember that I once noticed template settings override config settings. So it is indeed a bit foggy what the difference between these options is?