Working with the line item table in CAF application service

Question

Hello SDNs,
I am trying to retrive a value from the Nested list of one of my application service.
for example,  suppose i have 2 operations in a application service, 1, calls the BAPI_PO_GETDETAIL1 based on the PO number given it returns the POItem, POServices tables.
2, operation accepts itemno and PO number as a input, and inside calls the 1st operation and wants deal with the POItem and POServices tables which of type standard BAPI classes nested under the main structure created in application service.
For example, i want to compare the item number given as input with the item numbers in the Item table, which is a output of 1st operation .
How to get the itemnumber from the POItem table, as this is a nested structure under POOut(defined in AS level) and how to compare this.
i have written the code as follows but it is returning the error. Can any look into this and suggest me.
public com.xxx.demo.goodsnserviceack.types.POProcessOut getPOServices(@javax.jws.WebParam(name="PONumber")
*     java.lang.String PONumber, @javax.jws.WebParam(name="POItem")*
*     java.lang.String POItem) {*
// POProcessOut is a output node of current operation
*          POProcessOut PPO= new POProcessOut();*
//POHeader details is the nested structure under POProcessOut
*          POHeaderdetails header=new POHeaderdetails();*     
//POOutDetails is the output structure of 1st operation     
*          POOutDetails pt=new POOutDetails();*
*          try{
//calling the first operation          *
*          pt= executeBAPIPOGetDetail(PONumber,"X","X");*
*          //setting header details*
*          header.setPO_NUMBER(pt.getPOHeader().getPO_NUMBER());*
*          header.setVendor(pt.getPOHeader().getVENDOR());*
*          header.setCOMP_CODE(pt.getPOHeader().getCOMP_CODE());*
*          header.setSTATUS(pt.getPOHeader().getSTATUS());*
*          PPO.setPOHeaderdetails(header);*
*     //comparing the POItem number from POItem table and input of current operation
                   List<BAPIMEPOITEM> itemlist= pt.getPOItem();*
*          while(itemlist.isEmpty()==false){*
*          String itemnum= itemlist.get(0).getPO_ITEM();*
*          if(itemnum.equals(POItem))*
*               PPO.setItemno(itemnum);*
*          catch(CAFServiceException e){*
*               e.printStackTrace();*
*          return PPO;*
Your inputs will be appreciated.
Thanks,
Sireesha.

Answer 1

Have you accessed the external webservice in this way:
EJBLocalHome localHome = HomeFactory.getInstance().getLocalHome("localejbs/sap.com/comptest/ACCRJAVAWSVI__DOCUMENT");
Method m = localHome.getClass().getMethod("create", new Class[]{});
ACCRJAVAWSVI__DOCUMENTLocal srv = (ACCRJAVAWSVI__DOCUMENTLocal)m.invoke(localHome, new Object[] {});
srv.validateLogin(input) ;
Aliaksei