Hello Glenn
Thank you for the definition of an aging report, it doesn’t really help though, as I seem to remember learning that an aged debtors doesn’t specifically relate to invoices only. The Chartered Institute of Management Accountants’ state that ‘The accounts receivable ageing schedule (or aged debtors analysis) is a listing of the customers making up your total accounts receivable balance’. What does help though, is you pointing me in the direction of the advanced search. Being able to see the credit balances in a list is exactly what I was looking for and of course, I can dump it into Excel. So thanks for this. 
Annamarie