Need help with my usecase based on transient ViewObject

Question

I am using 11.1.1.4.0 Jdev version. I need help with my usecase.Been trying it for 2 days but couldn't figure out the issue.
I have a transientVO . In this VO Rows will be populated programmatically. CountryId is an attribute of this VO. I have created a viewAccessor "CountriesVA" from Country VO of HR schema.
I have a LOV for the countryId which is based on this VA ,getting countries from CountryTable.
This is the model part which works fine.
Before the page load i have called  a method to create a row for this transientVO.Once the row is created i can see the SOC in my page which i have created as below.
Now i want to insert a row in the transientVO if user selects a country and restrict duplicate entry . (As One row is already created 1st time there will be no rows created.after that rows will be inserted)
The issue is :: Suppose there are 2 countries. A & B .When user does the following actions :
Insert A . Done //as 1st entry
Insert B . Done //as 1st time entry
Insert A . duplicate not inserted
Insert B . getting inserted // the bug.
<af:selectOneChoice value="#{bindings.CountryId.inputValue}"
                        label="#{bindings.CountryId.label}"
                        required="#{bindings.CountryId.hints.mandatory}"
                        shortDesc="#{bindings.CountryId.hints.tooltip}" id="soc1"
                        immediate="true" autoSubmit="true"
                        valueChangeListener="#{pageFlowScope.managedBean.countryIdVC}">
    public void countryIdVC(ValueChangeEvent valueChangeEvent) {
        // Add event code here...
        String oldValue=null;
          setEL("#{bindings.CountryId.inputValue}", valueChangeEvent.getOldValue());
          if(evaluateEL("#{bindings.CountryId.attributeValue}")!=null)
         oldValue =evaluateEL("#{bindings.CountryId.attributeValue}").toString();
                setEL("#{bindings.CountryId.inputValue}", valueChangeEvent.getNewValue());
        String newValue=evaluateEL("#{bindings.CountryId.attributeValue}").toString();
        BindingContainer bindings = BindingContext.getCurrent().getCurrentBindingsEntry();
         DCIteratorBinding dciter = (DCIteratorBinding) bindings.get("ViewObj1Iterator");
         //access the underlying RowSetIterator
         RowSetIterator rsi = dciter.getRowSetIterator();
      boolean duplicate=true;
      if(oldValue!=null){
                rsi.getCurrentRow().setAttribute("CountryId", oldValue);
    //  Row row= rsi.findByKey(new Key(new Object[] { newValue}), 1)[0];
      Key key =new Key(new Object[] { newValue});
      Row row=rsi.getRow(key);
      if(row==null){
      System.err.println(duplicate);
        duplicate=false;
      }else{
        rsi.setCurrentRow(row);
         if(!duplicate){
         //get handle to the last row
         Row lastRow = rsi.last();
         //obtain the index of the last row
         int lastRowIndex = rsi.getRangeIndexOf(lastRow);
         //create a new row
         Row newRow = rsi.createRow();
         newRow.setAttribute("CountryId", newValue);
         //initialize the row
         newRow.setNewRowState(Row.STATUS_INITIALIZED);
         //add row to last index + 1 so it becomes last in the range set
         rsi.insertRowAtRangeIndex(lastRowIndex +1, newRow);
         //make row the current row so it is displayed correctly
         rsi.setCurrentRow(newRow);

Answer 1

I read the reply from Andrejus Baranovskis and thought of studying and implementing that in my useCase.Well it worked . I implemented the same Logic but rowIteration was done in AppModule.
Con-Fusion, Bugs, Facts &amp;amp; Workarounds: Iterating through View Object RowIterator Bug.(NOT ADF BUG, Development B…
http://docs.oracle.com/cd/E15523_01/web.1111/b31974/bcservices.htm#sm0206
9.7.6 What You May Need to Know About Programmatic Row Set Iteration
The problem is solved ,the above links helped me solve the problem.
what i did is i have created a method in appmodule to iterate rows and all the method y operation bindings and my logic works fine ....
MY Advice to all Adf developers ,though i am not an expert but i can assure you to follow the above process for rowIteration.If you use the  iterator binding in the manage bean to navigate the rows u'll face issues which are unexpected.
In AppModule :::::
    public boolean createRow(String oldValue,String newValue){
     System.err.println(oldValue+""+newValue);
      ViewObjectImpl vo=getViewObj1();
      boolean duplicate=false;
      if(oldValue!=null){
      RowSetIterator iter = vo.createRowSetIterator(null);
      System.err.println("iterating rows ");
         while (iter.hasNext()) {
             Row r = iter.next();
             System.err.println(iter.getRangeIndexOf(r)+" row is "+r.getAttribute("CountryId"));
             if(r.getAttribute("CountryId").toString().equals(newValue)){
                 duplicate=true;
                 break;
             // Do something with the current row.
         // close secondary row set iterator
         iter.closeRowSetIterator();
      return duplicate;
In ManageBean :::::
    public void countryIdVC(ValueChangeEvent valueChangeEvent) {
        // Add event code here...
        String oldValue=null;
       System.err.println("Old Value"+valueChangeEvent.getOldValue());
          setEL("#{bindings.CountryId.inputValue}", valueChangeEvent.getOldValue());
          if(evaluateEL("#{bindings.CountryId.attributeValue}")!=null)
         oldValue =evaluateEL("#{bindings.CountryId.attributeValue}").toString();
                setEL("#{bindings.CountryId.inputValue}", valueChangeEvent.getNewValue());
        String newValue=evaluateEL("#{bindings.CountryId.attributeValue}").toString();
        BindingContainer bindings = BindingContext.getCurrent().getCurrentBindingsEntry();
         //access the name of the iterator the table is bound to. Its "allDepartmentsIterator"
         //in this sample
         DCIteratorBinding dciter = (DCIteratorBinding) bindings.get("ViewObj1Iterator");
         //access the underlying RowSetIterator
         RowSetIterator rsi = dciter.getRowSetIterator();
         if(oldValue!=null){
                      rsi.getCurrentRow().setAttribute("CountryId", oldValue);
           OperationBinding operation = bindings.getOperationBinding("createRow");
           operation.getParamsMap().put("oldValue", oldValue);
           operation.getParamsMap().put("newValue", newValue);
      if(!(Boolean)operation.execute()){
      //get handle to the last row
      Row lastRow = rsi.last();
      //obtain the index of the last row
      int lastRowIndex = rsi.getRangeIndexOf(lastRow);
      //create a new row
      Row newRow = rsi.createRow();
      newRow.setAttribute("CountryId", newValue);
      //initialize the row
      newRow.setNewRowState(Row.STATUS_INITIALIZED);
      //add row to last index + 1 so it becomes last in the range set
      System.err.println("Inserting row at index "+lastRowIndex+1);
      rsi.insertRowAtRangeIndex(lastRowIndex +1, newRow);
      //make row the current row so it is displayed correctly
      rsi.setCurrentRow(newRow);
      else{
        System.err.println("Data found So not inserting,only setting current Row");
      Key key =new Key(new Object[] { newValue});
        rsi.setCurrentRow(rsi.getRow(key));