sorry Rajesh
But I do not agree with you since we have this mentioned in the CI-5 Ariba Documentation :
An RFQ created in SAP ERP can be defined as a Strategic Sourcing document type. Because SAP requires a mandatory vendor field in RFQs, a placeholder supplier is provided for strategic sourcing documents. Strategic sourcing documents are converted by the Ariba Network Adapter for SAP NetWeaver into a cXML quoteRequest document. Placeholder vendor information is automatically discarded during conversion.
Regards
Marcel H.