The Replication Agent automatically creates the replication definition during initialization (execution of pdb_xlog init command) and by setting the configuration parameter pdb_auto_create_repdefs to true for Oracle warm standby.
When the Replication Agent detects a logical connection (by querying the RSSD), the replication definitions created by the Replication Agent are customized to support an Oracle warm standby environment.
In certain scenarios, where the warm standby environment is replicated to a non-warm standby database, you must create a second replication definition for each table or stored procedure you plan to replicate.