Canon 943

1. The provision of an office which is by law not vacant is by

that very fact invalid, and a subsequent vacancy does not validate the provision. 2. But if it is a question of an office

which by law is conferred for a determined period of time the

Canonical provision can be made within six months before the expiration of this time, and it takes effect on the day of the vacancy of the office. 3. A promise of an office, no matter by

whom it is made, has no canonical effect.