Passing Parameters to Transaction Iview

Hi

Here's the Scenario -

CRM Portal hosts the link to Create Quotation transaction iview(TCode VA21) in EP. We are passing the parameter Customer_Number (sold-to-party) in the URL.

The user clicks on the link, the iview opens, user fills the mandatory field (Quotation Type) on the initial screen and clicks on Item Overview Button. The field sold-to-party on the resultant screen should be set by default to the value being passed in the URL.

I could successfully set all the fields on the initial screen through URL, but unable to do so for the Item Overview screen.

Any pointers on how it can be done?

Thanks,

Prerana