public List<PackagingSourceItem> getSelectedItems() {
    List<PackagingSourceItem> items = new ArrayList<>();
    for (SourceItemNode node : getSelectedSourceItemNodes()) {
      final PackagingSourceItem sourceItem = node.getSourceItem();
      if (sourceItem != null && sourceItem.isProvideElements()) {
        items.add(sourceItem);
      }
    }
    return items;
  }
public List<PackagingSourceItem> getSelectedItems()