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

IF126 - Overview

• 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.

IF126 - Details

• 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