How To Fix FKKINV649 - Reversing billing doc. &1 not allowed. Follow-on doc. &2 already exists.

FKKINV649 - Overview

• Message type: E = Error

• Message class: FKKINV - Invoicing in Contract Accounts Receivable and Payable

• Message number: 649

• Message text: Reversing billing doc. &1 not allowed. Follow-on doc. &2 already exists.

Self-Explanatory Message

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FKKINV649 - Details

• The SAP error message FKKINV649 indicates that you are trying to reverse a billing document (identified as &1) but the reversal is not allowed because a follow-on document (identified as &2) already exists. This situation typically arises in the context of billing and invoicing within the SAP Convergent Invoicing (CI) or Contract Accounts Receivable and Payable (FI-CA) modules.
  
  Cause:
  
  Existing Follow-On Document: The primary reason for this error is that there is a follow-on document (like a payment, credit memo, or another billing document) that has been created based on the original billing document you are trying to reverse. SAP does not allow the reversal of a billing document if there are dependent documents that rely on it.
  Document Status: The status of the billing document may also prevent reversal if it has been processed in a way that makes it non-reversible (e.g., if it has been cleared or settled).
  
  
  Solution:
  
  
  Check for Follow-On Documents: