Replication Server version 15.7.1 - Sybase ASE 15.5 to Oracle EE 12.1.0.2 (64 bit) replication failing
By default the repagent (in Sybase DB Y) will not replicate maintenance user transactions (ie, transactions replicated from Sybase DB X to Sybase DB Y).

To get the repagent (Sybase DB Y) to also replicate maintenance transactions (ie, transactions from Sybase DB X, once applied in Sybase DB Y, are then re-replicated to Oracle), you'll need to configure the Sybase DB Y repagent:

use &lt;Sybase_DB_Y&gt;
go
sp_config_rep_agent &lt;Sybase_DB_Y&gt;,'send maint xacts to replicate',true
go
sp_stop_rep_agent &lt;Sybase_DB_Y&gt;
go
-- wait for repagent to go down and then ...
sp_start_rep_agent &lt;Sybase_DB_Y&gt;
go