If you acquire an interest in an inheritance, you may lose it. This may happen even when the seller has a court decision confirming the acquisition of the inheritance and is entered in the land and mortgage register.
According to art. 1036 of the Civil Code, the heir may, with the consent of the remaining heirs, dispose of (e.g., sell) a share in an item belonging to the estate. If any of the other heirs do not consent, the regulation is ineffective insofar as it would infringe the rights of the heir under the provisions on the division of the estate. We are dealing here with the so-called relative ineffectiveness. This means that the contract is valid, but may be ineffective against the heir who has not agreed to sell the share. He may then claim a division of the estate as if there was no share purchase agreement at all.
Such a right arises only if the rights of the heir who did not express his consent were violated. For example, if the heir who has made the sale has received donations during his lifetime in excess of his share of the inheritance, then it should be omitted from the division of the estate. Then the heirs who did not consent should receive the entire inheritance, and the acquirer of the share in the property belonging to the inheritance will lose his share. He may possibly pursue claims against the vendor under the warranty for legal defects.