DUP_TRANSACTION_CWOBJ1523=CWOBJ1523I: Received a duplicate transaction, {0}. Transaction will be thrown away.
Explanation
The replica received a transaction that was already processed. This could happen if the replica thought it was missing a transaction, requested it again and the original transaction came in later.
User response
If this happens frequently, consiser raising the transaction lag threshold to allow more time before a transaction is labeled as missing and requested.