How to delete a line item in DI Server

Hi, i tried delete a line item in oorders which DI Server, I have 4 lines in this order, how delete rows 2 and 3 i tried this request:

<?xml version="1.0" encoding="UTF-8"?>
<env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope">
   <env:Header>
      <SessionID>B9D17BF9-0891-444D-BF52-9165041D8575</SessionID>
   </env:Header>
   <env:Body>
      <dis:UpdateObject xmlns:dis="http://www.sap.com/SBO/DIS">
         <BOM>
            <BO>
               <AdmInfo>
                  <Object>oOrders</Object>
               </AdmInfo>
               <QueryParams>
                  <DocEntry>60906</DocEntry>
               </QueryParams>
               <Documents>
                  <row>
                     <DocObjectCode>17</DocObjectCode>
                     <DocType>I</DocType>
                     <DocDate>20160519</DocDate>
                     <DocDueDate>20160519</DocDueDate>
                     <TaxDate>20160519</TaxDate>
                     <CardCode>CN10001175</CardCode>
                     <PaymentGroupCode>-1</PaymentGroupCode>
                     <PayToCode>PRINCIPAL</PayToCode>
                     <ShipToCode>GENERAL</ShipToCode>
                     <NumAtCard>REENCAFEWEB</NumAtCard>
                     <SalesPersonCode>3</SalesPersonCode>
                     <DiscountPercent>0.00</DiscountPercent>
                     <Comments />
                  </row>
               </Documents>
               <Document_Lines>
                  <DocumentLine>
                     <LineNum>0</LineNum>
                     <ItemCode>0103101452</ItemCode>
                     <Quantity>1</Quantity>
                     <TaxCode>IVAG01</TaxCode>
                     <UnitPrice>168109</UnitPrice>
                     <DiscountPercent />
                     <WarehouseCode>R101</WarehouseCode>
                     <SalesPersonCode>3</SalesPersonCode>
                     <CostingCode>P001</CostingCode>
                     <CostingCode2>P100EC</CostingCode2>
                     <CostingCode3>Ventas</CostingCode3>
                     <CostingCode4>103</CostingCode4>
                  </DocumentLine>
                  <DocumentLine>
                     <LineNum>1</LineNum>
                     <ItemCode>0103101452</ItemCode>
                     <Quantity>1</Quantity>
                     <TaxCode>IVAG01</TaxCode>
                     <UnitPrice>168108</UnitPrice>
                     <DiscountPercent>0.00</DiscountPercent>
                     <WarehouseCode>R101</WarehouseCode>
                     <SalesPersonCode>3</SalesPersonCode>
                     <CostingCode>P001</CostingCode>
                     <CostingCode2>P100EC</CostingCode2>
                     <CostingCode3>Ventas</CostingCode3>
                     <CostingCode4>103</CostingCode4>
                  </DocumentLine>
               </Document_Lines>
            </BO>
         </BOM>
      </dis:UpdateObject>
   </env:Body>
</env:Envelope>

Thanks.