How to create sales return with multiple invoices

Hi ,

I am creating a sales order return with reference of billing document using FM SD_SALESDOCUMENT_CREATE, if i give one Billing document as a reference document it is creating document perfectly.

But my Requirement is to create one Return sales order with multiple invoices.

I tried to pass reference document no's in Item level , but it take first reference document number only , for that reference document only return is creating.

Can you any one help me how to create this.

Thanks in advance

Swapna.