How To Fix AH766 - Document &4 -> invoicing document &3 not reversed in invoicing

AH766 - Overview

• Message type: E = Error

• Message class: AH - IS-U billing (master data)

• Message number: 766

• Message text: Document &4 -> invoicing document &3 not reversed in invoicing

What causes this issue?

In the billing order for installation &v1& (scheduled billing date &v2&
), billing document &v4& is marked as having been reversed for
adjustment.
Billing document &v4& corresponds to invoicing document &v3&, which has
not been reversed yet in invoicing.
In this case, billing document number &v4& in the billing order cannot
be deleted.

System Response

How to fix this error?

To delete &v4&, you must first reverse invoicing document &v3&.

Error message extract from SAP system. Copyright SAP SE.

AH766 - Details

• The SAP error message AH766 indicates that there is an issue with the reversal of an invoicing document. Specifically, it states that the document (identified by &4) could not be reversed in the invoicing document (identified by &3). This error typically arises in the context of invoice processing and can be related to various factors.
  Causes:
  
  Document Status: The invoicing document may be in a status that does not allow for reversal. For example, if the document is already cleared or settled, it may not be possible to reverse it.
  Dependencies: There may be dependencies on other documents or transactions that prevent the reversal. For instance, if the document is linked to a payment or another accounting entry, it may not be reversible until those dependencies are resolved.
  Authorization Issues: The user attempting to perform the reversal may not have the necessary authorizations to execute the reversal.
  
  Configuration Issues: There may be configuration settings in