Regarding BAPI output

Question

Hi,
   In my application, after giving input "SelectedRole" in one view and clicking submit button, it calls the following method which is in the custom controller.
public void executeZbapi_Roles_Tcodes_Display_Input( )
    //@@begin executeZbapi_Roles_Tcodes_Display_Input()
     try {
          Zbapi_Roles_Tcodes_Display_Input bapiInput = new Zbapi_Roles_Tcodes_Display_Input();
          wdContext.nodeZbapi_Roles_Tcodes_Display_Input().bind(bapiInput);
          bapiInput.setRole(wdContext.currentContextElement().getSelectedRole());
                    wdContext
                         .currentZbapi_Roles_Tcodes_Display_InputElement()
                         .modelObject()
                         .execute();
                    wdContext.nodeOutput().invalidate();
               } catch (WDDynamicRFCExecuteException ce) {
                    IWDMessageManager manager = wdComponentAPI.getMessageManager();
                    manager.reportException(ce.getMessage(), false);
    //@@end
It executes a bapi and retrieves a table which is mapped to a table in another view in webdynpro.
  I am able to get the output for the corresponding input. But what the problem is when I go back to the first view and click submit again with the same input, the table contains all the values twice. Likewise how many times I am submitting, that many times its getting displayed in the table. Actually its getting added to the same table. What I needed is the table should get cleared everytime and then it should display the required output.
How can I do this??
Regards,
Kalai

Answer 1

Hi Bharath,
   I have done like what u said.  But still the same condition. I dint understand ur point clearly. Also I dint understand the concept of invalidating the Model Node. Can u explain me in detail??
    This is what I did.
<b>(In FirstView)</b>
wdThis
                                   .wdGetSampleModelCust0Controller()
                                   .executeZbapi_Roles_Tcodes_Display_Input();
                              wdThis.wdFirePlugToSecondView();
<b>(In Custom Controller)</b>
public void executeZbapi_Roles_Tcodes_Display_Input( )
    //@@begin executeZbapi_Roles_Tcodes_Display_Input()
     try {
          Zbapi_Roles_Tcodes_Display_Input bapiInput = new Zbapi_Roles_Tcodes_Display_Input();
          wdContext.nodeZbapi_Roles_Tcodes_Display_Input().bind(bapiInput);
          bapiInput.setRole(wdContext.currentContextElement().getSelectedRole().toUpperCase());
                    wdContext
                         .currentZbapi_Roles_Tcodes_Display_InputElement()
                         .modelObject()
                         .execute();
               } catch (WDDynamicRFCExecuteException ce) {
                    IWDMessageManager manager = wdComponentAPI.getMessageManager();
                    manager.reportException(ce.getMessage(), false);
    //@@end
<b>(In Second View)</b>
public void onActionBackToR3View(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent )
Zbapi_Roles_Tcodes_Display_Input bapiInput = new Zbapi_Roles_Tcodes_Display_Input();
               wdContext.nodeZbapi_Roles_Tcodes_Display_Input1().bind(bapiInput);
            wdContext.nodeZbapi_Roles_Tcodes_Display_Input1().invalidate();
          wdThis.wdFirePlugToFirstView();
Can u explain me in detail: why we have to bind the node to a new BAPI object?