OAException.ERROR in extended controller class is not stopping the execution flow in OAF

Hi All,

             I am trying the extend the controller to add some custom validation logic and through an error to stop the flow. I can see the validation message but page flow is not stopping. Please let me know why it is not working? You can find below the code I wrote in extended controller class.

    public void processFormRequest(final OAPageContext oaPageContext, final OAWebBean oaWebBean)

    {

      super.processFormRequest(oaPageContext, oaWebBean);

        final OAApplicationModule applicationModule = oaPageContext.getApplicationModule(oaWebBean);

        String username = oaPageContext.getUserName();

        if (!"SYSADMIN".equals(username))

        {

          final OAMessageDateFieldBean oaMessageDateFieldBean = (OAMessageDateFieldBean)oaWebBean.findIndexedChildRecursive("NRRERStartDate");

          final OAMessageDateFieldBean oaMessageDateFieldBean2 = (OAMessageDateFieldBean)oaWebBean.findIndexedChildRecursive("NRREREndDate");

          String parameter3 = null;