For each item you record which suppliers you can buy it from.
Suppliers per itemPer supplier: the supplier's item number, purchase unit and conversion factor, gross price, discount, net price, currency, minimum quantity and lead time.
Preferred supplierOne supplier per item is the favourite. A purchase proposal starts from that supplier.
Delivery slotsPer warehouse and per supplier, the days and hours when deliveries are accepted.
Supplier conditionsLean can hold back an order that does not meet the supplier's conditions, such as a minimum quantity.