Item Cost Price Editing Service and Custom Items  Service and Custome item cost prices can be edited on the Item setup. To add or edit the unit cost price of service and Custom items go to: Inventory Module> Configuration> Inventory Setup Search the required service or custom item.  Click edit Click the Pricing Level Tab Click the Cost Button Enter the cost price. Save and Close Stock Items There are only 2 ways to update the cost price of a stock item: Processing a Goods Received Voucher (GRV)  Process a Stock Value Adjustment This is because stock is an asset, and any adjustments to the cost price will affect the stock (asset) Valuation. As such an actual entry needs to be processed so the control account balances or is affected accordingly.