public String doModifyParamter( HttpServletRequest request )
    {
        List<Parameter> listParam = new ArrayList<Parameter>(  );
        String paramName = request.getParameter( PARAMETER_NAME );
        String paramValue = request.getParameter( PARAMETER_VALUE );
        Parameter param = new Parameter(  );
        populate( _report, request );

        if ( ( paramName != null ) && ( paramValue != null ) && !paramName.isEmpty(  ) && !paramValue.isEmpty(  ) )
        {
            param.setName( paramName );
            param.setValue( paramValue );
            listParam.add( param );
        }

        _report.setParameter( listParam );

        // Check constraints
        if ( !validateBean( _report, VALIDATION_ATTRIBUTES_PREFIX ) )
        {
            return redirect( request, VIEW_MODIFY_REPORT, PARAMETER_ID_REPORT, _report.getId(  ) );