Diagnosis
Billing document &V1& originates from the legacy system and is notmarked as reversible.
Billing documents from a legacy system can only be reversed foradjustment; this means they can be reversed in billing only - not ininvoicing. However, this is not possible in this case.
The billing document is required for technical reasons - such asestablishing the new start of billing - and toprovide information.

Procedure
If necessary, create a credit memo/backbilling using theManual Billing function.