SUM по Amount в Query. С динамическими фильтрами по Grid

[raz]

display real mSumAll()
{
  CashflowFactTrans_MCFR CFT;
  Query     q =new Query(cashflowFactTrans_ds.queryRun().query());
  ;
  qbds=q.dataSourceNo(1);

  qbds.addSelectionField(fieldNum(CashflowFactTrans_MCFR, Amount), SelectionField::Sum);

  qr= new QueryRun(q);
  qr.next();
  CFT = qr.get(tableNum(CashflowFactTrans_MCFR));

  return   CFT.Amount;
}