How To Fix FKK_EBS015 - Invoice number &1 is not unique; more than 1 document found

FKK_EBS015 - Overview

• Message type: E = Error

• Message class: FKK_EBS - Interface between FI-CA and External Billing System

• Message number: 015

• Message text: Invoice number &1 is not unique; more than 1 document found

Self-Explanatory Message

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FKK_EBS015 - Details

• The SAP error message FKK_EBS015 indicates that there is an issue with the uniqueness of an invoice number in the system. Specifically, it means that when the system attempted to process an invoice, it found multiple documents associated with the same invoice number, which is not allowed.
  
  Cause:
  
  Duplicate Invoice Numbers: The most common cause is that the same invoice number has been used for more than one document in the system. This can happen due to data entry errors, system integration issues, or incorrect processing of invoices.
  Incorrect Configuration: There may be issues with the configuration of the invoice processing settings, leading to the system not recognizing the uniqueness of invoice numbers.
  Data Migration Issues: If data has been migrated from another system, duplicate invoice numbers may have been introduced during the migration process.
  
  
  Solution:
  
  Identify Duplicates: Use transaction codes like SE16 or SE11 to query the relevant tables (e.g., FKKINV, BKPF) to find all