By way of derogation from the provisions of 2° of Article 773, the existence and truthfulness of debts resulting from the application of articles L. 321-13 et seq. of the Rural and Maritime Fishing Code are sufficiently proven to the administration by all acts and writings, even subsequent to the death of a farmer, likely to be used as evidence in court between the farmer’s co-heirs or representatives. The heir creditor of the estate is however required to provide, in the forms and according to the rules determined by Article L. 20 of the Book of Tax Procedures, a certificate, dated and signed by him, stating the amount of his claim on the farmer’s estate.