AP Closing , Generate Accounting Problem

[mhpkokgc]

Dear Members,
To close AP period we run Payables Accounting Process ,it is displaying that the program was unable to generate accounting for two transactions.
Voucher no and document no for both events is same as 1259, 12246780-A
and event type is Invoice Cancellation
Prepayment Unapplication.
We don't want to swap it to next period. How to fix this for the same period we want to close.
Also show some light on cause of the problem.
Regards

[mhpkokgc]

Read Doc 418288.1 on metalink. A patch need to be applied