Hi Laxman,
And I have one question - Once this PO is created in ECC shd this created Auto confirmation to SNC ??
No there should not be any confirmation sent to SNC.
In WVM7 setting remove Cust(Ship-to-party) - 7200.
Check the business partner of the customer in the ORDSP IDoc(segement E1EDKA1 field PARTN)
Cust(Sold-to-party) should be same as value of the field PARTN.
Then reprocess the IDoc
Regards,
Nikhil