private static ConceptDateComparator oCdtCmp = new BillNotes().new ConceptDateComparator();
private Collection<Concept> concepts(AtrilSession oSes, boolean bOnlyOpen, String sEmployeeUuid) {
String sTaxPayerId = getDocument().parents().get(0).id();
Dms oDms = oSes.getDms();
SortableList<Document> oLst = (SortableList<Document>) oDms.query("BillNote & (($taxpayer='" + sTaxPayerId + "')"+(bOnlyOpen ? " & ($is_open='1')" : "")+")");
TreeSet<String> oSet = new TreeSet<String>();
ArrayList<Concept> oCps = new ArrayList<Concept>();
for (Document d : oLst) {
Document b = oDms.getDocument(d.id());
AttributeMultiValue a = b.attribute("concept");