Use 'invoice' processing for negative fee totals. For reversals only.

&Information&
Process negative fee totals in invoice receipt as follows:
Normal processing: choose 'credit memo'
Reversal: choose 'invoice'
in the first screen of the invoice receipt transaction.
If you process a neg. fee invoice receipt as an 'invoice', the values
will be set to zero.

Error message extract from SAP system. Copyright SAP SE.