[raz]

while select CustTrans
                order by TransDate asc
                where CustTrans.AccountNum   == accountNum                 &&
                    CustTrans.TransDate            >= element.fromDate()        &&
                    CustTrans.TransDate            <= toDate                          &&
                    CustTrans.RContractAccount == contractAccount
exists join LedgerTrans
     where LedgerTrans.Voucher == CustTrans.Voucher &&
               LedgerTrans.TransDate == CustTrans.TransDate &&
               LedgerTrans.AccountNum == ledgerAccountTab &&
               LedgerTrans.PostType == LegerPostType::CustBalans

как то так. по памяти пишу