Solution to Integration Scenario: RFC - XI - RFC

Hi ,
Our company is implementing a PI project. The aim is to integrate a product into SAP via PI.
The product is written in C#, using a middle ware called 'ERPConnect' to call RFC from SAP system.
The requirement is that ALL integration processes should be triggered from C# via RFC calls.  The integration is synchronous.
So, if there is no PI, the thing is very simple. it is like RFC calls between two SAP systems. Say, ECC_A calls RFC from ECC_B
Now, when the process goes via PI, how to design it?
I guess, the receiver RFC adapter would be pointing to ECC_B in above example.
My question is,
1. How to define the sender RFC adapter?
2. How to execute/test the scenario?
Thanks,
BR, Richard.

Option1:
You can use WCF frame work in .net enviroment to send data to SAP PI as a SOAP call then receiver side you can use RFC adapter to connect ECC,SOAP and RFC both supports Syn communictaion.
Option2:
Expose Function module and C# side code as a web services and call using PI, in this case both sides you have to use SOAP.
Option3:
Existing process if both system supporting RFC calls then use RFC sender and receiver adapter .
Regards,
Raj

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