How To Fix FKKEXC604 - External ID of payment &1 already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: FKKEXC - Message Class for External Payments

• Message number: 604

• Message text: External ID of payment &1 already exists

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message FKKEXC604 - External ID of payment &1 already exists ?

  The SAP error message FKKEXC604 indicates that there is a conflict with an external ID for a payment that you are trying to process. Specifically, it means that the external ID you are attempting to use for a payment already exists in the system. This can happen in various scenarios, such as when processing incoming payments, creating invoices, or handling financial transactions.
  Cause:
  
  Duplicate External ID: The external ID you are trying to use has already been assigned to another payment or transaction in the system.
  Data Entry Error: There may have been a mistake in entering the external ID, leading to a conflict with an existing record.
  Integration Issues: If you are integrating with external systems (like payment gateways), the same external ID might be sent multiple times.
  
  Solution:
  
  Check Existing Records: Look up the external ID in the system to see which payment or transaction it is associated with. You can do this by using transaction codes like FBL1N (Vendor Line Item Display) or FBL5N (Customer Line Item Display).
  Use a Unique External ID: If the external ID is indeed already in use, you will need to generate a new, unique external ID for the payment you are trying to process.
  Review Integration Settings: If the error is occurring due to integration with external systems, ensure that the external IDs being generated are unique and not reused.
  Consult Documentation: Check SAP documentation or your organization's guidelines for handling external IDs to ensure compliance with best practices.
  Contact Support: If you are unable to resolve the issue, consider reaching out to your SAP support team or consulting with SAP experts for further assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes for managing financial documents, such as F-28 (Post Incoming Payments) or F-32 (Clear Customer).
  SAP Notes: Search for SAP Notes related to FKKEXC604 for any patches or updates that may address this issue.
  Custom Development: If your organization has custom developments or enhancements, check if they might be affecting the handling of external IDs.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.