How to use sell-through and safety stock to correct inaccurate e-commerce replenishment forecasts

Last week, we replenished according to the system's suggestions. The model seemed correct, but we still ran out of two SKUs. After a review, we found that the prediction formula didn't fail completely; rather, the sell-through rate changed after the big promotion, while the safety stock was still calculated based on normal sales volume. I pulled the sell-through, lead time, in-transit inventory…