Forecast consumption on product family and member item

Hi,

My forecast model is based on product families with members items like Finished Goods or ATO items.

Forecast consumption is done in EBS.

Most of the time forecast are put on the product family, so any SO on a member item consumes the forecast on the product family.

Sometimes for procurement issue forecast are put directly on the FG or ATO item, whatever it's still a member of a product family. As a result forecast consumption occurs both on item and product family.

What's the setup to consume forecast only on the FG/ATO item when forecast is put at item level, even if it's part of a product family which is also forecasted (for other items)?