How To Fix /SAPAPO/OM_ERROR2139 - Write mode for creating a trace file is neither 'open' nor 'append'

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/OM_ERROR2 -

• Message number: 139

• Message text: Write mode for creating a trace file is neither 'open' nor 'append'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/OM_ERROR2139 - Write mode for creating a trace file is neither 'open' nor 'append' ?

  The SAP error message /SAPAPO/OM_ERROR2139 indicates that there is an issue with the mode specified for creating a trace file in the SAP Advanced Planning and Optimization (APO) system. The error message specifically states that the write mode for creating a trace file is neither 'open' nor 'append', which means that the system is unable to determine how to handle the trace file correctly.
  Cause:
  
  Incorrect Write Mode: The write mode specified for the trace file is not valid. The system expects either 'open' (to create a new file) or 'append' (to add to an existing file).
  Configuration Issues: There may be a misconfiguration in the settings related to trace file generation in the APO system.
  Code Issues: If this error arises from custom code or enhancements, there may be a bug or oversight in how the trace file is being handled.
  
  Solution:
  
  Check Configuration: Review the configuration settings related to trace file generation in the APO system. Ensure that the write mode is set correctly to either 'open' or 'append'.
  Modify Code: If the error is occurring in custom code, review the relevant code sections to ensure that the write mode is being set correctly. Make sure that the mode is explicitly defined as either 'open' or 'append'.
  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 this issue.
  Debugging: If you have access to debugging tools, you can trace the execution of the code to see where the write mode is being set and identify any discrepancies.
  Consult Documentation: Review the official SAP documentation for the APO system to understand the expected parameters for trace file creation.
  
  Related Information:
  
  SAP APO: Advanced Planning and Optimization is a part of the SAP Supply Chain Management suite that helps organizations with planning and optimization processes.
  Trace Files: Trace files are used for logging and debugging purposes in SAP systems. They can help in diagnosing issues by providing detailed information about system processes.
  SAP Community: Engaging with the SAP Community forums can provide insights from other users who may have encountered similar issues.
  
  If the problem persists after trying the above solutions, consider reaching out to SAP support for further assistance.