Hi Rita,
Plz check the below blog, where i had pushed the messages from ECC to SNC via PI
Integrating SNC with SAP PI ( PO and ASN COLLABORATION IN A BROADER VIEW)
I had discussed for PO and ASN processes, and I had used Idoc and Proxy communication.
Then plz let me know ,whats your exact requirement based on that, I will try to help you,.
BR,
Karthick