When Greentree Desktop defaults the item cost to a purchase order line or an AP invoice line, it works through this hierarchy:
Note: If the Inventory Module Control option Default cost price to zero if no last supplier cost is selected, the search stops and the cost defaults to zero.
Note: This comes from the last PO net price, from the item location first, or from the master level if no location cost is found.
Note: If standard costing is in use, the cost always defaults to PO and AP inventory item lines if the Inventory Module Control option Use as default for data entry is also selected. If the option is not selected, Greentree Desktop uses a location level cost first, or the master level standard cost if the location level cost is zero.