Using Cancellation Posting for a Voucher Adjustment

You can cancel a posted voucher one time. The entire amount of the original voucher is cancelled; partial adjustments cannot be made.

Open the General Parameters form and make sure Enable Cancellation Posting is selected.
Open the A/P Vouchers and Adjustments form and click the filter-in-place button.
Select Actions > New.
Specify this information:

Vendor

Specify the vendor for which a voucher must be cancelled.

Type

Specify Adjustment.

Cancellation

Select this check box.

Voucher

Specify the voucher to which to apply the cancellation. The list of posted vouchers to which you can apply cancellation posting does not include those that are referenced by posted adjustments or payments.
Complete the voucher and save the record.