Reorder items and forecast: is it the right thing to have both together?

Forecast are used to prevent planning of any new demands coming. But, is it meaningful to use forecast with reorder point items? I would say no, just what I think. I am saying this because the reorder point is calculated from the safety stock + average demand during lead time. Thus, the reorder point level intrinsctly have a forecast on what would be the demand (the average). Thus, it is not meaningful to include forecast when reorder point is used