Purchline Change confirmed date Axapta

void clicked()
{
  PurchLine                 tmpPurchLine;
  PurchLine                 updatePurchLine;
  PurchLine                 selectedRecord;

  Dialog            dl;
  DialogField       dlfTransdate;
;

    dl  = new Dialog("Change confirmed date");
    dlfTransdate = dl.addFieldValue(typeid("Transdate"),today(),"Confirmed date");
    if(dl.run()){
        selectedRecord =  PurchLine_ds.cursor();
        for (tmpPurchLine = PurchLine_ds.getFirst(true) ? PurchLine_ds.getFirst(true) : PurchLine_ds.cursor();
        tmpPurchLine;    tmpPurchLine = PurchLine_ds.getnext())
        {
            ttsbegin;
            SELECT FORUPDATE updatePurchLine
             WHERE updatePurchLine.PurchId == tmpPurchLine.PurchId
                && updatePurchLine.VendAccount == tmpPurchLine.VendAccount
                && updatePurchLine.LineNum == tmpPurchLine.LineNum
                && updatePurchLine.ItemId == tmpPurchLine.ItemId;
            updatePurchLine.ConfirmedDlv = dlfTransdate.value();
            updatePurchLine.update();
            ttscommit;
        }
        PurchLine_ds.reread();
        PurchLine_ds.research();
        PurchLine_ds.findRecord(selectedRecord);
    }
    super();
}