Notwithstanding the rules applicable to inter vivos gifts, the property given will, unless otherwise agreed, be valued on the day of the shared gift for the purposes of imputation and calculation of the reserve, provided that all the heirs with reserve rights alive or represented at the death of the ascendant have received a lot in the anticipated sharing and have expressly accepted it, and that no provision has been made for a reserve usufruct relating to a sum of money.