@WebService
public interface Transaction {
@WebMethod(action="createPurchase", operationName = "purchase")
ResultDto purchase(@WebParam(name = "PurchaseRequest") PurchaseRequest request) throws SQLException, ClassNotFoundException;

}

package com.bb.impl;

@WebService
public class TransactionImpl implements Transaction{

private Logger logger = Logger.getLogger(TransactionImpl.class);



@SuppressWarnings("static-access")
public TransactionImpl() {

}


@WebMethod(action="createPurchase", operationName = "purchase")
@WebResult(name="Result")
public ResultDto purchase(@WebParam(name = "PurchaseRequest") PurchaseRequest request) throws SQLException, ClassNotFoundException {
}

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:impl="http://impl.qiib.com/">
<soapenv:Header/>
<soapenv:Body>
  <impl:purchase>    --> This impl prefix I want to remove while generating the request
     <!--Optional:-->
     <PurchaseRequest>
        <dealId>?</dealId>
        <partyId>?</partyId>
     </PurchaseRequest>
   </impl:purchase>
   </soapenv:Body>
</soapenv:Envelope>