Reversing posted drop shipment - wrong dates

Yahoo Archive
1
In December, I had a user who entered a December, 2001 date drop shipment. Since then, we've posted both the AP and AR invoice. This transaction is now causing havoc in our financials.

Does anyone have a process they have used to reverse the effects of this transaction in 2001, and cause it to hit the books for December, 2012? We are on 9.05.700b.

Thanks.

Kevin Simon