For predictions to work a total of 24 months of historical data (two fiscal years) must be provided. To accurately validate the predictions, 36 months of historical data is required.
We need at least 24 months of historical data to generate a predictive model. Once the model is generated, predictions will be available in the solution on the 25th month. An additional 12 months of historical data is needed to validate the model and predictions. Once this process is complete, you will be able to self-validate the predictions in the solution on the 37th month. For more information, see Validate predictions against actuals.
Note: The initial model is created from the first 24 months of available data and is used for predictions for the following 12 months. A separate model is then created every 12 months, learning from the additional historical data.