How to find unreconciled invoices for a BP for a date before?

Hi, Expert,

Now is Jan 26th, 2009, but how could we get all unreconciled A/R invoices for a customerr at the date of Dec 31, 2008?

Because we received some incoming payment in January, when we go to 'Business Partiners' -> 'Internal Reconciliation', we could see all unreconciled invoice at the current date. When I change the posting date to 'Dec 31, 2008', it still shows the same unreconciled invoices. - - - I think, it's because when we record incoming payments, the invoices are automatically reconciled and could not be reversed.

We need this for Yearly financial statement auditing purpose. Thanks!

Lorrie