How To Fix AH787 - Billing doc. &1 reversed for adjustment already reversed in invoicing

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 787

• Message text: Billing doc. &1 reversed for adjustment already reversed in invoicing

What causes this issue?

In the billing order for installation &v2& (see the billing document
for scheduled billing date and billing transaction), billing document
&v1& is marked as having been reversed for adjustment in the
<LS>Doc.no. in adj. rev.</> field.
However, billing document &v1& was already reversed in invoicing; see
the offsetting document &v4& for invoicing document &v3& (entry in
table ERCHC with SPCANC = "X").
You should not process the billing order for which the adjustment
reversal is set; this would only generate a difference bill relative to
billing document number &v1&. This could mean that the customer is
charged too little since the invoicing document has been reversed (and
this counters the point of an adjustment reversal).

System Response

How to fix this error?

Check the billing and invoicing situation.
If necessary, you can delete the document number adjustment reversal in
the billing order using Transaction EA24 <LS>Delete adjustment reversal
document number from billing order</>.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AH787 - Billing doc. &1 reversed for adjustment already reversed in invoicing ?

  The SAP error message AH787 indicates that a billing document has been reversed, but the system has detected that an adjustment related to that billing document has already been reversed in the invoicing process. This situation typically arises in the context of billing and invoicing processes in SAP, particularly when dealing with credit memos or adjustments.
  Cause:
  
  Duplicate Reversal: The error usually occurs when there is an attempt to reverse a billing document that has already been reversed or adjusted. This can happen if the user is not aware that the document has already been processed.
  Inconsistent Data: There may be inconsistencies in the billing document status or related documents, leading to confusion in the system.
  Incorrect Document Flow: The document flow may not be properly maintained, causing the system to misinterpret the status of the billing document.
  
  Solution:
  
  Check Document Status: Verify the status of the billing document in question. Use transaction codes like VF03 (Display Billing Document) to check if the document has already been reversed.
  Review Related Documents: Look at the related documents (e.g., credit memos, invoices) to ensure that the adjustments have been processed correctly and that there are no pending actions.
  Avoid Duplicate Actions: Ensure that you are not attempting to reverse a document that has already been reversed. If a reversal is necessary, confirm that it is the correct document and that it has not been processed previously.
  Consult with SAP Support: If the issue persists and you cannot determine the cause, it may be beneficial to consult with your SAP support team or refer to SAP Notes for any known issues or patches related to this error.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as VF01 (Create Billing Document), VF02 (Change Billing Document), and VF03 (Display Billing Document).
  SAP Notes: Check SAP Notes for any updates or specific fixes related to error AH787. SAP Notes can provide insights into known issues and recommended solutions.
  Documentation: Review SAP documentation on billing and invoicing processes to understand the workflow and how reversals are handled.
  
  By following these steps, you should be able to identify the cause of the error and take appropriate action to resolve it.