Get total debit and credit against voucher in x++

Hi any one please give me the query to get total debit and credit in X++ on the base of voucher #,not on the base of JounalNum,i am working on General ledger voucher report and i have to get debit and credit in single line and multiple line case,i am not getting one value say debit 100 and other value credit 0 in single line case from LedgerJournalTrans Table.(In Voucher credit is balanced by offset account).