The calculation formula of single product purchase is generally: the best purchase quantity = stock low limit ≤ (planned stock low limit - existing stock) ≤ inventory high limit, inventory low limit must be guaranteed, stock high limit is purchased Time to make reference. Existing inventory = existing physical stock existing physical stock = set amount of stock = (average sales quantity × expected in the number of days customer latest order) × management error rate management error rate should be greater than 1 .
Note: The calculation formula for the best stock is: optimal stock = inventory low limit ≤ (existing stock - defective product) ≤ inventory high limit, existing stock = existing physical stock in the existing physical stock = Already failed in stock
In the way: refers to the "procurement plan" or "purchase order" has been issued, and there is no stock in the way.
