How To Fix PR429 - Overflow when calculating a seasonal index; 0 or 99.99 is set

SAP Error Message - Details

• Message type: E = Error

• Message class: PR - Forecast: Help messages

• Message number: 429

• Message text: Overflow when calculating a seasonal index; 0 or 99.99 is set

What causes this issue?

With the calculation of a seasonal index, either the maximum value
of 99.99 was exceeded, or it fell short of the minimum value of 0
(negative seasonal index). Both cases can also occur repeatedly.
In addition, it is possible that both excesses and shortfalls were
found. In these cases, the values 0 or 99.99 are set by the system.

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?

Check the choice of forecast model. If sporadic past development
exists, an average model may be more suited.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message PR429 - Overflow when calculating a seasonal index; 0 or 99.99 is set ?

  The SAP error message PR429, which indicates an "Overflow when calculating a seasonal index; 0 or 99.99 is set," typically occurs in the context of demand planning or forecasting within the SAP system. This error suggests that there is an issue with the seasonal index calculation, which is crucial for accurate forecasting.
  Cause:
  
  
  Data Issues: The error often arises when the data used for calculating the seasonal index is not appropriate. This could include:
  
  Missing or incomplete historical data.
  Data that is not properly formatted or contains invalid values.
  Seasonal patterns that are not well-defined due to insufficient data points.
  
  
  
  Configuration Issues: Incorrect settings in the forecasting model or parameters can lead to this error. For example, if the seasonal index is set to 0 or an unrealistic value like 99.99, it can trigger an overflow during calculations.
  
  
  Model Limitations: The forecasting model being used may not be suitable for the data set, leading to extreme values in the seasonal index.
  
  
  Solution:
  
  
  Data Validation: 
  
  Check the historical data for completeness and accuracy. Ensure that there are no missing values or outliers that could skew the seasonal index calculation.
  Ensure that the data is properly formatted and adheres to the expected structure.
  
  
  
  Review Configuration:
  
  Review the settings of the forecasting model being used. Ensure that the seasonal index is not set to 0 or an unrealistic value.
  Adjust the parameters of the forecasting model to better fit the data.
  
  
  
  Adjust Seasonal Patterns:
  
  If the seasonal index is calculated based on a specific period, ensure that the periods are correctly defined and that there is enough data to establish a reliable seasonal pattern.
  Consider using a different forecasting method if the current one does not yield reasonable seasonal indices.
  
  
  
  Consult Documentation: 
  
  Refer to SAP documentation or help resources for specific guidelines on configuring seasonal indices and troubleshooting related errors.
  
  
  
  Testing: 
  
  After making adjustments, run a test calculation to see if the error persists. Monitor the results to ensure that the seasonal index is calculated correctly.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed.
  SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP support for further assistance.
  
  By addressing the underlying data and configuration issues, you should be able to resolve the PR429 error and successfully calculate the seasonal index.