(1) A transaction may be contested against the heir or other comprehensive legal successor of the other party to such transaction.
(2) A transaction may be contested against another legal successor if such legal successor
1. was aware of the circumstances giving rise to the enrichment of the predecessor being subject to contention on the date of his or her enrichment;
2. belonged to the persons with a close relationship to the debtor (section 138) on the date of his or her enrichment unless the legal successor was unaware of the circumstances giving rise to the enrichment of the predecessor being subject to contest on such date;
3. received the enrichment by way of a gratuitous transfer.