A book inventory monetary value of a selected product in the retail store is received. The book inventory monetary value is the monetary value of the selected product according to the accounting records of a retail store. A perpetual inventory (PI) monetary value is also received from the retail store. The PI monetary value is a product of multiplying a PI value for the selected product with the cost of the selected product. The book inventory monetary value and the PI monetary value are stored in a database. Subsequently, the book inventory monetary value and the PI monetary value are retrieved from the database. A difference between the book inventory monetary value and the PI monetary values is determined. An adjustment of the PI value is determined based upon the difference.