Forecast error calculation

[Former Member]

Hello Experts,

I have doubts in the basics of forecasting process. I have set up my planning book in such a way that I can execute both Univariate as well as Composite forecasting.

1. I have set up a univariate forecast profile with Forecast strategy 99 (External Forecast). Which BAdI and which method should I use to implement the algorithm for this external forecast model? I am not sure if I have to use the BAdI /SAPAPO/SCM_FCSTPARA method EXTERN_FCST.

2. I would like to execute composite forecast. The system should select the best forecast result which has the least User-Defined error measure as the final forecast value. Now, which BAdI and which method should I use to implement the algorithm for user specific error measure? I am not sure if I have to use the BAdI /SAPAPO/SDP_FCSTERR method ERROR_CALCULATE. What is the purpose of the method FCST_ERROR_CAL in the BAdI /SAPAPO/SCM_FCSTPARA? In which case the BAdI /SAPAPO/SDP_FCSTERR method ERROR_CALCULATE is executed? And in which case BAdI /SAPAPO/SCM_FCSTPARA method FCST_ERROR_CAL is executed?

3. I have to implement customer specific logic for outlier correction. This outlier correction should be executed only for External Forecast model (99). For other models, the standard outlier correction should be executed. Should I use the BAdI /SAPAPO/SCM_FCSTPARA method OUTLIER_CAL? Because when I implement the BAdI /SAPAPO/SCM_FCSTPARA this method is called for all of the forecast models.

4. In my customer specific forecast algorithm, I have to use alpha and beta values. Alpha can vary from 0.1 to 0.5, Beta can vary from 0.1 to 0.5, each with step value of 0.05. But when setting up the forecast profile for this external forecast (99), the alpha and beta is not appearing as ranges. Only for forecast strategy - Automatic Model Procedure (56), the system provides flexibility to choose the range values and step values. How can i change this? Should I use the method PARAMETER_SET of the BAdI /SAPAPO/SCM_FCSTPARA?

Thanks and Best Regards,
Suresh

[Former Member]

Hello Experts,

The confusions i got are:

1. If i implement the outlier correction in BAdI /SAPAPO/SCM_FCSTPARA, will this be the only method that will be called for any forecasting model? Or will it be called only for external forecast (99) model?

2. If i implement the BAdI /SAPAPO/SCM_FCSTPARA, then will the BAdI /SAPAPO/SDP_FCSTERR be called for any forecast model? Or it will not be called?

Best Regards,
Suresh

[Former Member]

Hello Experts,

Any comments on this?

Best Regards,
Suresh