How To Fix F5691 - System error in the FI interface

F5691 - Overview

• Message type: E = Error

• Message class: F5 - Document Editing

• Message number: 691

• Message text: System error in the FI interface

What causes this issue?

When importing the interface data, the system tried to read the
currency data with the following keys:
application key "&v1&"
application reference "&v2&"
application organizations "&v3&"
item number "&v4&"
It could not, however, find any currency data for these key fields.

System Response

The interface data in the FI/CO document in question is not consistent.

How to fix this error?

This is a system error. Contact the SAP Hotline service.
You must check the consistency between the line items and the currency
information in the FI/CO application.

Error message extract from SAP system. Copyright SAP SE.

F5691 - Details

• The SAP error message F5691, which indicates a "System error in the FI interface," typically arises during the processing of financial transactions in the Financial Accounting (FI) module. This error can be caused by various issues, including configuration problems, data inconsistencies, or system-related issues.
  Causes:
  
  
  Configuration Issues: Incorrect settings in the FI module or related components can lead to this error.
  Data Inconsistencies: Missing or incorrect data in master records or transaction data can trigger this error.
  System Bugs: Occasionally, bugs in the SAP system or specific patches may cause unexpected behavior.
  Authorization Issues: Lack of proper authorizations for the user executing the transaction can also lead to errors.
  Integration Issues: Problems with the integration between FI and other modules (like MM or SD) can result in this error.
  
  Solutions:
  
  Check Configuration: Review the configuration settings in the FI module to ensure they are set up correctly. This includes checking the settings for document types, posting keys, and