How To Fix FKKINV059 - External number of document additional item &3 is not unique

FKKINV059 - Overview

• Message type: E = Error

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

• Message number: 059

• Message text: External number of document additional item &3 is not unique

What causes this issue?

For the billing document with the <DS:DE.REFDOCNO_KK>external document
number</> &v1& in the <DS:DE.LOGSYS>logical system</> &v2&, the
<DS:DE.REFADDITEM_KK>number of the document additional item in the
external system</> &v3& is not unique.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

FKKINV059 - Details

• The SAP error message FKKINV059 indicates that there is a problem with the uniqueness of the external number for a document's additional item. This typically occurs in the context of the SAP Convergent Charging or Contract Accounts Receivable and Payable (FI-CA) modules, where external document numbers are used to identify transactions.
  
  Cause:
  The error arises when the system detects that the external number assigned to an additional item is not unique. This can happen due to several reasons:
  
  Duplicate Entries: There may be multiple entries in the database with the same external number for the same document type.
  Incorrect Configuration: The configuration settings for external number ranges may not be set up correctly, leading to overlaps.
  Data Migration Issues: If data was migrated from another system, it may have introduced duplicates.
  Manual Entry Errors: Users may have manually entered the same external number for different transactions.
  
  
  Solution:
  To resolve the error, you can take the following steps:
  
  
  Check for