SOAP --XI ---RFC or Java Client Proxy

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Hello Gurus,

Need your adivce for a scenario in XI

Scenario --- To implement XI with SAP SCEM(Supply Chain Event Management).

Client is sending data from Web Portal (JSP Page) and wants to integrate with R/3.

(Request from client and Response from R/3 shown again at browser )

Web Portal (JSP Page) is on server A and XI on server B

Queries ---

1. Can I use Java Client Proxy Approach --- proxy --- xi -- rfc approach

If Web Portal (JSP page) is working in server A and XI in server B then can I call xi server from jsp page by passing xi server credential (username,password,bus service) and using sync Interface I can show result back to browser.

2. For SOAP Approach -- SOAP -- XI --- RFC approach

Suppose I need to send two parameters from my Web Portal (JSP page) to xi to R/3 and it will return some result.

Concept of Webservice --- any application (like BAPI ) exposed.

a. Pls tell me all the steps required for IR and ID

b.How can I invoke that generated webservice from my jsp page --- so that my request parameters values go to xi from my jsp page and to R/3 and then result from R/3 to xi and to my jsp page.

Regards