Every accounting system I've used allows me to print the sales/purchase history for an individual product. This is invaluable for resolving stock discrepancies, or just doing sales analysis. Currently the Product Sales Report dumps a list of ALL products, which is far less useful in the above and many other cases.

There is this similar idea for adding a sales history within the Product details page: https://feedback.repairshopr.com/forums/165658-general/suggestions/17166851-item-sales-history