67. For the purpose of valuating differences in compensation, differences between job classes based on any of the following factors shall not be taken into account:1° seniority, unless this factor is applied so as to discriminate on the basis of gender;
2° an assignment of fixed duration, such as an employee training, development or orientation assignment;
3° the region in which the employee works, unless this factor is applied so as to discriminate on the basis of gender;
4° a shortage of skilled workers;
5° the temporary maintenance of a person’s compensation following a reclassification or demotion, so that the person is not penalized due to a new rate of compensation or compensation scale, provided the compensation applicable to the employees in the same job class catches up to the person’s compensation within a reasonable time;
5.1° a handicapped person’s compensation under a special arrangement;
6° non-enjoyment of benefits having pecuniary value by reason of the temporary, casual or seasonal nature of a position.