How To Fix /SAPAPO/TSM026 - Planning book horizon is smaller than forecast horizon

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/TSM -

• Message number: 026

• Message text: Planning book horizon is smaller than forecast horizon

Self-Explanatory Message

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• What is the cause and solution for SAP error message /SAPAPO/TSM026 - Planning book horizon is smaller than forecast horizon ?

  The SAP error message /SAPAPO/TSM026 Planning book horizon is smaller than forecast horizon typically occurs in the context of SAP Advanced Planning and Optimization (APO), particularly when working with planning books and forecasting.
  Cause:
  This error indicates that the planning horizon defined in the planning book is shorter than the forecast horizon set for the product or location. In other words, the time frame for which you can plan (the planning book horizon) does not cover the time frame for which you are trying to generate forecasts (the forecast horizon). This mismatch can lead to issues in planning and forecasting processes.
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Planning Book Settings:
  
  Go to the planning book configuration in SAP APO.
  Verify the planning horizon settings for the planning book you are using. Ensure that the planning horizon is set to cover the required forecast horizon.
  
  
  
  Adjust Forecast Horizon:
  
  If the planning book horizon is correct and you do not want to change it, consider adjusting the forecast horizon to fit within the planning book horizon. This can be done in the forecasting settings.
  
  
  
  Modify the Planning Book:
  
  If necessary, modify the planning book to extend the planning horizon. This may involve changing the configuration settings in the planning book definition.
  
  
  
  Consult Documentation:
  
  Review the SAP documentation or help files related to planning books and forecasting to understand the specific settings and configurations that may be relevant to your scenario.
  
  
  
  Test Changes:
  
  After making adjustments, test the changes by attempting to run the forecast or planning process again to ensure that the error no longer occurs.
  
  
  
  Related Information:
  
  Planning Book Configuration: Understanding how to configure planning books in SAP APO is crucial. This includes knowing how to set the planning horizon and how it interacts with other settings.
  Forecasting in SAP APO: Familiarize yourself with the forecasting methods and settings in SAP APO, as they can impact how forecasts are generated and how they relate to planning horizons.
  SAP Notes and Support: If the issue persists, consider checking SAP Notes for any known issues or patches related to this error message. You can also reach out to SAP support for assistance.
  
  By ensuring that the planning book horizon and forecast horizon are aligned, you can resolve the /SAPAPO/TSM026 error and continue with your planning and forecasting activities in SAP APO.