Function validate_one_credit_registration_path 

fn validate_one_credit_registration_path(
    enable_credit_registration_via_suotar: bool,
    enable_registering_completion_to_uh_open_university: bool,
) -> ModelResult<()>

Both paths would put the same attainment in Sisu. course_modules_one_credit_registration_path enforces this too; here it becomes an error the module editor can render.