How To Fix IF126 - Errors while the interest document was being written

SAP Error Message - Details

• Message type: E = Error

• Message class: IF - Messages re interest accounting in PS/CO/IM

• Message number: 126

• Message text: Errors while the interest document was being written

What causes this issue?

Due to an internal error, the system could not write the source
documents in tables tzin1 ... tzin4.

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?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message IF126 - Errors while the interest document was being written ?

  The SAP error message IF126, which states "Errors while the interest document was being written," typically occurs in the context of financial transactions involving interest calculations, such as in the case of loans or investment accounts. This error can arise due to various reasons, and addressing it usually involves a few steps to identify and resolve the underlying issue.
  Possible Causes:
  
  Configuration Issues: Incorrect configuration in the interest calculation settings or in the financial document types can lead to errors.
  Data Inconsistencies: Missing or incorrect data in the master data (e.g., customer/vendor accounts, bank details) or transaction data can cause the system to fail when trying to create the interest document.
  Authorization Problems: The user may not have the necessary authorizations to create or modify interest documents.
  System Errors: Technical issues or bugs in the SAP system can also lead to this error.
  Missing Customization: If the interest calculation is customized, missing or incorrect custom code can lead to errors.
  
  Solutions:
  
  Check Configuration: Review the configuration settings for interest calculation in the relevant modules (e.g., FI-AR, FI-AP). Ensure that all necessary parameters are correctly set.
  Validate Master Data: Ensure that all relevant master data is complete and accurate. Check for missing or incorrect entries in customer/vendor accounts, bank details, and other related data.
  Review Authorizations: Verify that the user has the necessary authorizations to perform the action that triggered the error. This may involve checking roles and permissions in the SAP system.
  Analyze Logs: Use transaction codes like SLG1 (Application Log) to check for detailed error logs that can provide more context about what went wrong during the document creation process.
  Debugging: If you have access to technical resources, debugging the process can help identify the exact point of failure in the code.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error. There may be patches or updates available that resolve known issues.
  Contact SAP Support: If the issue persists and cannot be resolved through the above steps, consider reaching out to SAP Support for further assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as FBL1N (Vendor Line Item Display), FBL3N (G/L Account Line Item Display), and FBL5N (Customer Line Item Display) to review related transactions.
  Documentation: Review SAP documentation related to interest calculation and financial document processing for additional insights and best practices.
  User Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to diagnose and resolve the IF126 error in SAP.