Forecast for product family

Forecast for product family is not working. Below is the what I have done

1. Created a product family
2. Assigned items to the PF with 50%, 25%, 25%
3. Create a new forecast set, forecast for the PF.
4. A new forecast for family members.
5. When I copy the forecast of PF to Family member forecast I expected the explosion to happen and see the member forecast values but what I see is the PF forecast amounts.

Any help is appreciated as its really urgent.

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