To set the purchase price, you have three options:
Via Last purchase price (net) in the item basic info
This field is relevant if you have not yet selected a supplier for this item and still want to set a purchase price, e.g. as part of the stock initialisation. The price you enter in this field will also be used when assigning the item to a supplier (and can of course be adjusted later, see below). As soon as you store a supplier order with this item, the value in the field is overwritten with the new purchase price.
Via Item assignment
If you purchase the same item from several suppliers, you can enter the purchase price for each supplier individually. To do this, open the supplier under Items → Purchasing → Suppliers and then switch to Item assignment. On the right-hand side, you will see all the items assigned to this supplier and can adjust the price by double-clicking in the corresponding field. The price for supplier orders is then determined by which supplier you order from.
Via CSV import
You can also enter the purchase price of an item by using the import profiles Pickware stocks (absolute values), Pickware stocks (relative change) or Pickware item supplier mappings. Further information on CSV import/export and the individual profiles can be found here.