You will need a Tcl Proc to be deployed on the Outbound tab (I frequently use the TPS Outbound Data UPoC to make a copy of the mesage and set its disposition to OVER.
This allows one copy to be delivered to the receiving system and the other copy goes to the inbound side of the outbound thread where it can be treated as DATA and routed, etc.
I have a proc you can use as an example.
If you would like that proc, then either email me or post here you want the proc.
email: jim.kosloskey@jim-kosloskey.com 29+ years Cloverleaf, 59 years IT - old fart.