Help in Quotation creation using BAPI

I want to create Quotation with reference to Inquiry. I am using std BAPI 'BAPI_QUOTATION_CREATEFROMDATA2' but I am not able to crate with reference to Inquiry. If you see the std tcode VA21 there is option to create with reference; there you can put the inquiry number. This functionality, I want to implement using BAPI.

Can anybody tell me how to achieve this.

Thanks in stack