Negative totals for transactions

Q: Why under Transactions does the total appear with a negative figure?

If you're talking about the Reservation Transactions dialog, that means a credit balance or credited amount, such as a payment.  If you mean the details in the Transactions tab view, this is actually inverted because the totals are calculated as a "system balance" -- Charges will be treated as a negative because they're a "debit" to the system, while payments will show as a positive "credit".  So when a subtotal is shown for any given group it can show a balance for that group.  For instance if you sort by Site so that it groups and subtotals for each site, you can see whether the charges and payments for that site's reservation are balanced.