These reports use the cost on the product at the time the Invoice was saved. It will either be the Invoice Cost, Average Cost, Last Cost, Replacement Cost, or Estimated Average Cost, depending on the cost setup on the Inventory Department for that product. This cost is found at Accounting / Setup / Inventory Departments. Select the appropriate department and choose Edit, then go to the G/L Posting tab. The Compute Invoice Cost By field can be changed by selecting the cost from the drop-down.
