schedulesPanel.setClosed();
schedulesPanel.setHeading(getPaymentScheduleHeading(data.getPaymentSchedules(), schedulesPanel));
gridBuilder.getPanel().add(schedulesPanel);
final GridBuilder innerGridBuilder = schedulesPanel.createGridBuilder();
final DivPanel dp = innerGridBuilder.getPanel();
dp.add(paymentSchedulePanel = new PaymentSchedulePanel(dp.newChildId(), new CompoundPropertyModel<AuftragDO>(data), getUser()));
paymentSchedulePanel.setVisible(data.getPaymentSchedules() != null && data.getPaymentSchedules().isEmpty() == false);
final Button addPositionButton = new Button(SingleButtonPanel.WICKET_ID) {
@Override
public final void onSubmit()
{