For cost and quality control, every Sale Invoice must have traceability to Lot and Purchase Order unique identification. The First In/First Out, Last In/Last Out and Average inventory revaluation methods loose cost detail once it is applied to the Accounting entries. No matter what method is used, it could be giving bad revenue reports. This course will explain how to record every Purchase Order Lot and cost. At the moment of a Sale, the record of Lot dispatch product to the client is necessary to calculate the exact revenue.