public void exportVersionningDocument() {
 			Object[] versionsToCompare1 = getScope().getOrderVersionsTable().getSelectedValues();

            // if there is none or more than one line to compare, lines must be selected using ctrl
            if (versionsToCompare1 == null || versionsToCompare1.length < 2) {
                log.error("Error in Order report ! : {},{}", FiviaServiceBundle.getString("error.order.comparaison"));
                throw new RuntimeException(FiviaServiceBundle.getString("error.order.comparaison"));
            }

               try {

            Object[] versionsToCompare = getScope().getOrderVersionsTable().getSelectedValues();


            // if there's only 2 lines, try to compare both
            if (getScope().getOrderVersionsTable().getValues() != null && getScope().getOrderVersionsTable().getValues().getRowCount() == 2) {
                versionsToCompare = ((List<T>) getScope().getOrderVersionsTable().getValues().getWrappedData()).toArray();
            }

           //more method logic...

        } catch (Exception e) {
            log.error("Error in Order versionning export ! " + e);
            throw new RuntimeException(FiviaServiceBundle.getString("error.common.report", e.getMessage()));
        }
    }