Safety Stock Quantity is the buffer quantity Business Central adds to demand so that planning keeps a reserve against demand peaks and late deliveries.
Safety stock is the quantity you want to keep available at all times to absorb demand variation and supplier delay. In Business Central it is stored in the Safety Stock Quantity field, and planning treats it as extra demand, so replenishment suggestions cover it. A related field, Safety Lead Time, adds a time buffer instead of a quantity buffer.
The field sits on the Item card, on the Planning FastTab, reached by pressing Alt+Q, searching for Items and opening the item. When you plan per location or variant, set it on the Stockkeeping Unit card instead, because that value takes precedence for the location concerned. A default safety lead time can be defined in Manufacturing Setup, and planning applies it whenever the field is left blank on the item or stockkeeping unit rather than writing a value onto the card.
Item BRG-1000 has Safety Stock Quantity 50 and uses Lot-for-Lot. Inventory is 60 pieces and a sales order for 40 pieces ships on 8 May 2026, which would leave 20. Planning therefore proposes a replenishment of 30 pieces so that 50 remain available after the shipment.
Double buffering is the classic error: a safety stock of 50 combined with a reorder point that already contains the same 50 makes you carry the reserve twice. A second problem is treating safety stock as untouchable: the quantity is not blocked and can be sold like any other stock, it only influences planning. Finally, generous safety stock on slow moving items ties up cash without improving service, and a value entered on the item card is ignored where a stockkeeping unit exists.
Review safety stock by item class rather than item by item: compute the demand variation and lead time variation from item ledger entries and set higher buffers only where the supply is genuinely unreliable. Recording a review date in a text field or in the item description helps you see which values have not been touched for years.
No. Safety stock only tells planning to keep a reserve. The quantity remains available for shipment, and selling into it simply triggers a new replenishment suggestion.
Use Safety Stock Quantity when demand is variable, and Safety Lead Time when the supplier delivery date is what varies. They can be combined, but be careful not to buffer the same risk twice.
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