How To Fix PR402 - Forecast values will be negative

PR402 - Overview

• Message type: E = Error

• Message class: PR - Forecast: Help messages

• Message number: 402

• Message text: Forecast values will be negative

What causes this issue?

The historical time series and the current forecast model will produce
negative forecast results.

System Response

The forecast results will be shown in the system as 0.

How to fix this error?

You may find that you obtain more satisfactory forecast results by
choosing a different forecast model.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message PR402 - Forecast values will be negative ?

  The SAP error message PR402, which states "Forecast values will be negative," typically occurs in the context of demand planning or forecasting within SAP's Advanced Planning and Optimization (APO) module or similar functionalities. This error indicates that the system has calculated forecast values that are less than zero, which is not permissible in most forecasting scenarios.
  Causes:
  
  Negative Historical Data: If the historical sales data used for forecasting contains negative values, it can lead to negative forecast values.
  Incorrect Forecasting Parameters: The settings or parameters used for the forecasting model may not be appropriate, leading to unrealistic forecast calculations.
  Data Entry Errors: Manual entries in the master data or transaction data that are incorrect can result in negative forecasts.
  Seasonality and Trends: If the model is not correctly accounting for seasonality or trends, it may produce negative forecasts.
  Demand Planning Settings: The settings in the demand planning area, such as the forecast model or algorithm, may