How To Fix PR326 - Forecast model & requires the entry of a weighting group

SAP Error Message - Details

• Message type: E = Error

• Message class: PR - Forecast: Help messages

• Message number: 326

• Message text: Forecast model & requires the entry of a weighting group

What causes this issue?

You have chosen a forecast model which requires a weighting group in
order to calculate the forecast values.

How to fix this error?

Please enter a weighting group.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message PR326 - Forecast model & requires the entry of a weighting group ?

  The SAP error message PR326 indicates that a forecast model requires the entry of a weighting group. This error typically occurs in the context of demand planning and forecasting within SAP's Advanced Planning and Optimization (APO) module or similar functionalities in SAP ERP.
  Cause:
  The error arises when you are trying to create or modify a forecast model, but the system requires a weighting group to be specified. Weighting groups are used in forecasting to assign different weights to historical data points, which can influence the forecast outcome. If this information is missing, the system cannot proceed with the forecast calculation.
  Solution:
  To resolve the PR326 error, you need to ensure that a weighting group is specified in the forecast model. Here are the steps to do this:
  
  
  Access the Forecast Model:
  
  Navigate to the transaction or application where you are managing your forecast models (e.g., transaction code /SAPAPO/MC90 for APO).
  
  
  
  Edit the Forecast Model:
  
  Open the specific forecast model that is causing the error.
  
  
  
  Specify the Weighting Group:
  
  Look for the field labeled "Weighting Group" or similar. Enter the appropriate weighting group that you want to use for your forecast model. If you do not have a predefined weighting group, you may need to create one.
  
  
  
  Save Changes:
  
  After entering the weighting group, save your changes to the forecast model.
  
  
  
  Re-run the Forecast:
  
  Once the weighting group is specified, you can re-run the forecast calculation to see if the error is resolved.
  
  
  
  Related Information:
  
  Weighting Groups: These are typically defined in the system and can be customized based on your business needs. They allow you to control how much influence different historical data points have on the forecast.
  Forecast Models: Different types of forecast models can be used in SAP, such as moving averages, exponential smoothing, etc. Each model may have different requirements for configuration.
  Documentation: Refer to SAP Help documentation for detailed information on configuring forecast models and weighting groups. This can provide insights into best practices and additional settings that may be relevant to your specific scenario.
  User Roles and Permissions: Ensure that you have the necessary permissions to edit forecast models and related settings in SAP.
  
  If you continue to experience issues after following these steps, it may be helpful to consult with your SAP support team or refer to SAP community forums for additional assistance.