Hi Sambaran,
I'm sorry but i'm a bit lost with your issue.
Please check this:
1. Is the issue on the request or response?
2. Do you two or more mappings in one direction?, i mean for example on the request you can set one message mapping and after a XSLT mapping.
3. Are you sure the data comes right to your SOAPlookup?
4. How are you generated the schemas for the inbound interface?. When you test with SOAPui tool, have you checked the schemas validate the request and response?
On the other hand, you could do it a dummy scenario, only to test the SOAP call, like SOAP to SOAP without any lookup.
Regards.