Thank you for the response, although it doesn't really help me. To explain further, I have accounts set for each financial year: Accounts 2206-07, Accounts 2007-08, etc. I carry the bank balance forward from year to year and it is this balance that gets added to my report totals.
I have worked round the problem by temporarily changing the opening balance to zero before running the reports for a given year and then putting it back to the correct figure afterwards, but it is only a workaround. Could the program perhaps be changed in some way, to force a zero starting balance in accounting transaction reports?