ABAP client (outbound) proxy - issue

Scenario - ECC to R3 4.6C system

RFC is developed on R3 system and is imported onto XI. The imported RFC is exported as XSD and imported as External definition for the messaage type on the ECC system.

There is an outbound sync interface on ECC system. We have developed and configured.

Idea is to send message from ECC via client proxy. I have generated the proxy in SPROXY of ECC.

I am trying to understand the different sections of generated proxy.

I am looking at sproxy screen of ECC 6.0 system

reg