Aggregation of the Forecast to product level

Hi,
In the Demand Planning We have a requirement that say there are 2 products A and B. We will execute the forecast   at the product level  and  we get forecast say 200 ifor product A and 300 ifor product B for next month.
Now i will run the forecast at the product group level(taking these 2 products in one selection) and i will get the forecast say 500. Now the requirement is that this forecast is to be disaggregated to 200 for product A and 300 for product B . Client do not like to run the forecast at the product level.If we run at the product group level,this should be disaggregated to the product level in such a way it shhould equal to the forecast when we run at product level.  Forecast profile is same for product and product group level. All the other parameters such as historical period,forecast periods etc are same at the product and product group level.
Please advise what are the settings required.
Thanks
Siva

Hi Siva,
If I understand correctly what you need is either you forecast at aggregate level or details level, forecast at details level should be same in both case.
This is more of chicken or egg come first situation. If you really like the forecast at the aggregate level to disaggregate same as forecast at detail level than I would suggest to forecast at lower level.
Reason being, Even though you use same forecast profile you will get different forecast numbers at lower level and aggregate level due to different sale pattern (Sales history) at detail level in case you are using complex forecast strategy.
You may take following approach to get some what near by results if not exact.
1. calculate "detail proportion factor" for all periods you want to forecast.
2. Forecast at product group level and dis aggregate based on this detailed proportion factors.
Hope this helps.
Regards,
Harshil Desai

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