OBN: How can we add the tcode of target system into Source System.?

Dear Experts,

I want to add a t-code ME53n of ERP) into a role as OBN target in my SAP TM.

I tried to add this t-code but could not find this t-code in SAP TM system.

How can we add the tcode of target system into Source System.?

I tries to import the role of target system but that does not work.

Please help!

Regards,

Saurabh