Thank you Tejas for your reply,
As i mentioned in the initial message, we have different systems for ECC and gateway and currently my gateway is running with 7.40. Sorry to say this, Your message is not so clear for my situation.
You have mentioned that, only need to have UIX on gateway system, you mean in this case we don't need to install the add-ons IWBEP, GBAPP on my back-end ECC system. If yes, then can you please share if you have any SAP reference notes/docs on this, so that we can explain to my customer to proceed.
Currently my project is on hold due to this prerequisite confusion.
Thanks in advance,
Regards,
Suresh Babu