class Transaction
{
    ...

    /**
     *
     * @ORMOneToOne(targetEntity="Transaction")
     * @ORMJoinColumn(name="reverse_transaction_id", referencedColumnName="id")
     * @var FinanceiroEntityMovimentacao
     */
    private $reverseTransaction;

    ...
}

CREATE TABLE `transaction` (
  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
   ...
  `reverse_transaction_id` bigint(20) unsigned DEFAULT NULL,
  ...
  PRIMARY KEY (`id`),
  ...
  KEY `fk_reverse_transaction_idx` (`reverse_transaction_id`),
  ...
  CONSTRAINT `fk_reverse_transaction` FOREIGN KEY (`reverse_transaction_id`) REFERENCES `transaction` (`id`) ON DELETE SET NULL ON UPDATE CASCADE,
  ...
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

/**
 * Consider that hydrate() is a method that hydrates the entity
 * based on the passed $data and the reference to the entity manager
 */

// Creation of the first transaction
$dataA = [
   ...
];
$transactionA = new Transaction();
$transactionA->hydrate($dataA, $entityManager);
$entityManager->persist($transactionA);
$entityManager->flush($transactionA);


// Creation of the second transaction
// Already pointing to the first one
$dataB = [
    ...
    'reverse_transaction' => $transactionA->getId()
    ...
];
$transactionB = new Transaction();
$transactionB->hydrate($dataB, $entityManager);
$entityManager->persist($transactionB);
$entityManager->flush($transactionB);


// Update of the first transaction to also point
// to the second one
// The error occurs here
$transactionA->setReverseTransaction($transactionB);
$entityManager->persist($transactionA);
$entityManager->flush($transactionA);