JspDocumentList

i have a problem…

          I submitted a form in jsp page with Method = get and i called another jsp page(invServ.jsp) as an action,In that invServ.jsp i invoked a flow service which contains the Pipeline in document as the following structure... 

PurchaseOrder(Document)

  1. HDR(Document)
    1.1 poId(string)
    1.2 senderAddress(string)
    1.3 receiverAddress(string)
    2.DTL(DocumentList)
    2.1 pId(string)
    2.2 pName (string)

http://10.200.73.125:5555/web/parani/jsp/invService.jsp?poId=123&senderAddress=ioui&vendorAddress=iouiou&btnSubmit=Submit+Order&pId=1&pName=Fessari&pId=2&pName=Ferrari

My problem is only the first product with id 1 and name fessari is mapped along with poId,senderAddress,vendorAddress the second product is not mappped what will be the problem?

thanks in advance