When a message from a replica database that is sent to the master database fails, the message remains in the replica database and it can be resent to the master database. The value of the STATE column of row in the SYS_SYNC_REPLICA_MSGINFO table is in this case 22 -R_SAVED. You can query names of those messages that have not been successfully sent to the master with the following SQL statement:
SELECT MSG_NAME FROM SYS_SYNC_REPLICA_MSGINFO WHERE STATE = 22;
When the reason for the failure has been resolved, failed messages can be resent to the master database by using the MESSAGE FORWARD statement in the replica database, see MESSAGE FORWARD.
For information about the possible values of the STATE column of the SYS_SYNC_REPLICA_MSGINFO table, see System tables.