Diagnosis
To carry out a debit memo it is necessary to create a debit memonotification in addition to setting a payment method. Such notificationsare created using transaction FPDDAX.

Procedure
Since setting the payment method alone is not sufficient, it is betternot to set any payment methods using manual document changes, butinstead to make these with transaction FPDDAX as this alsogenerates the notification so that the item can also be collected.