How To Fix FKKEXC165 - Payment &1 is unknown to system

FKKEXC165 - Overview

• Message type: E = Error

• Message class: FKKEXC - Message Class for External Payments

• Message number: 165

• Message text: Payment &1 is unknown to system

What causes this issue?

Payment &v1& of branch &v2&, cash desk &v3& is to be reversed. However,
this payment has not yet arrived in the system (database table <LS>
DFKKEXC</>).

System Response

The message with the reversal information is returned.

How to fix this error?

First enter the payment &v1&. Check whether the payment is waiting in an
inbound queue and has not been processed yet.
Once you have entered the payment, you can process the reversal message
again.

Error message extract from SAP system. Copyright SAP SE.

FKKEXC165 - Details

• The SAP error message FKKEXC165, which states "Payment &1 is unknown to system," typically occurs in the context of the Contract Accounts Receivable and Payable (FI-CA) module. This error indicates that the system cannot find the specified payment document or that the payment document is not recognized in the current context.
  Causes:
  
  Incorrect Payment Document Number: The payment document number provided may be incorrect or mistyped.
  Document Not Posted: The payment document may not have been posted in the system yet.
  Document Deleted or Archived: The payment document may have been deleted or archived, making it unavailable for processing.
  Authorization Issues: The user may not have the necessary authorizations to view or process the payment document.
  Data Consistency Issues: There may be inconsistencies in the database or issues with the data integrity.
  
  Solutions:
  
  Verify Payment Document Number: Check the payment document number for accuracy. Ensure that it is entered correctly.
  Check Document Status: Use transaction codes like FBL5N (Customer