Daniele,
Strategy 60 is not really very suitable for planning SemiFinished goods.
Strategy 60 forecasts are placed against the planning material. These forecasts are consumed by Sales orders against the materials that are linked to the Planning material. Since there are typically no Sales orders against SemiFinished goods, it makes no sense to plan them using Strategy 60; there would be no consumption.
Typically, FGs are planned via strategy 60, and the linked SemiFinished Goods do not use a strategy. They are planned only via eploded demands from the FGs and from the Planning Material. These demands represent the exploded from aggregated Sales + Forecast demands.
Best Regards,
DB49