Revocation never takes place ipso jure.
The application for revocation is made within one year, from the day of the opening of the succession, if it is based on neediness. It is made within one year, from the day of the act imputed by the renouncing party or from the day on which the act could have been known by his heirs, if it is based on failure to fulfil maintenance obligations or on one of the acts referred to in 3° of Article 930-3.
Revocation pursuant to 2° of article 930-3 is pronounced only to the extent of the needs of the person who had renounced.