SFTP to AS2(non-seeburger): How to get sender Filename to be used in AS2 Receiver Channel

Hi Experts,

I have this scenario,

SFTP > Process Orchestration > AS2(non-seeburger)

My interface is not using Message Mapping and I want to use the source Filename as my Receiver Filename.

Sender

orders_1234 - source filename

Receiver

orders_1234 - target filename

How to do it in Process Orchestration without Seeburger.

Thanks and Best Regards,

           Orlan