Hi Martin,
Myself & Priyanka Chavan are working together on this Gateway Implementation, on which we are currently stuck.
I understand, recalling a year old-setup and issue resolution could be quite barbaric on the memory, but if you can give it a second try we will really really appreciate it. For your reference, I am enclosing some screen-shots in and around the solution mentioned above by you. Please have a look and let's know if something strikes back.
RFC Defined to Back-end ECC System[System: PD8 Client: 250]
RFC Test for above is in place.
SPRO --> Maintain SAP System Aliases
Also, as per the thread http://scn.sap.com/message/14032839 when we are trying to register the service, we strangely observe that,on Gateway system in SEGW Service --> Service Maintenance the "Add Service" button is grayed out (disabled) as shown below. Any thoughts on this as to how can we achieve this?
Rgds,
Akshay.