final ContentProvider sheetProvider = sheet.getContentProvider();
sheetProvider.putFormat(AccountsCol.DATE_OF_LAST_MODIFICATION, "dd.MM.yyyy HH:mm");
sheetProvider.putFormat(AccountsCol.DATE_OF_CREATION, "dd.MM.yyyy HH:mm");
sheetProvider.putFormat(AccountsCol.NUMBER, "#");
final KontoDao kontoDao = Registry.instance().getDao(KontoDao.class);
final QueryFilter filter = new QueryFilter();
filter.addOrder(Order.desc("lastUpdate"));
final List<KontoDO> list = kontoDao.getList(filter);
final PropertyMapping mapping = new PropertyMapping();
for (final KontoDO konto : list) {
mapping.add(AccountsCol.NUMBER, konto.getNummer());
mapping.add(AccountsCol.NAME, konto.getBezeichnung());