I've managed to get the workitem history by the following code. But it doesn't work to get attachment add/removal history. RTC web ui & eclipse client have managed to do so. They keep a history of adding/removal attachments, and adding links. How to do this in plain java?

public List<abstractoutputdto> fetchWorkItemCompleteStates(ITeamRepository repo, int wiid, final String outputType) throws TeamRepositoryException, RTCAdapterException {
    final ResettingTimer t = new ResettingTimer(this, true);
    final IWorkItem currentWi = this.getWIByID(repo, wiid);
    DevLog.super_trace("current wi stateId: " + currentWi.getStateId().getUuidValue());
    final IItemManager itemManager = repo.itemManager();
    // ATTACHMENT
    IWorkItemWorkingCopyManager wcm = this.getWCM(repo);
    wcm.connect(currentWi, IWorkItem.FULL_PROFILE, null);
    WorkItemWorkingCopy wc = wcm.getWorkingCopy(currentWi);
    List<ireference> rL = wc.getReferences().getReferences(WorkItemEndPoints.ATTACHMENT);
    DevLog.debug("---------->"+rL.size());
    List<iattachmenthandle> aL = wc.getReferences().getDeletedAttachments();
    DevLog.debug("deleted attachment size:L "+aL.size());
    for (IAttachmentHandle atmtH : aL) {
        final IAttachment atmt = (IAttachment) repo.itemManager().fetchCompleteItem(atmtH, IItemManager.DEFAULT, null);
        final AtmtInfoOutputBO aiob = new AtmtInfoOutputBO();
        aiob.setAtmtName(atmt.getName());
        aiob.setDescription(atmt.getDescription());
        aiob.setCreationDate(atmt.getCreationDate() == null ? null : atmt.getCreationDate().toString());
        aiob.setId(atmt.getId());
        DevLog.debug("----eleted attachment: "+Invoker.reportObj(aiob));
    }
    // state handle list
    final List<iauditablehandle> shL = itemManager.fetchAllStateHandles((IAuditableHandle) currentWi.getItemHandle(), null);
    List<iworkitem> wiL = new ArrayList<iworkitem>();
    t.lapAndReset();
    wiL = itemManager.fetchCompleteStates(shL, null);
    t.lapAndReset();
    Class<? extends AbstractOutputDTO> oc = this.getClassByOutputType(outputType);
    DevLog.super_trace("output dto class decided to be: " + oc.getCanonicalName());
    final List<abstractoutputdto> odL = new ArrayList<abstractoutputdto>();
    for (IWorkItem stateWi : wiL) {
        DevLog.debug("Converting stateWi id: " + stateWi.getId());
        try {
            // final AbstractOutputDTO od = EnrichOByWIS.ins.enrichOByWI(repo, stateWi, oc);
            UDStateOutputDTO od = new UDStateOutputDTO();
            od.setModifiedDate(stateWi.modified().toString());
            od.setStateId(stateWi.getStateId().getUuidValue());
            // CONTRIBUTOR
            final Contributor c = (Contributor) repo.itemManager().fetchCompleteItem(stateWi.getModifiedBy(), IItemManager.DEFAULT, null);
            od.setModifiedBy_name(c.getName());
            od.setModifiedBy_emailAddress(c.getEmailAddress());
            DevLog.super_trace("returned state: " + Invoker.reportObj(od));
            odL.add(od);
        } catch (TeamRepositoryException e) {
            e.printStackTrace();
        }
        /
        * catch (IllegalAccessException e) { e.printStackTrace(); } catch (InstantiationException e) { e.printStackTrace(); }
        /
    }
    t.lapAndReset();
    return odL;
}