When you open a material's detail view, you'll see a table showing the complete history of all operations involving this material.
This table includes all purchases, stock adjustments, production usage, transfers, write-offs, and inventory audits for the material. The sum of all values in the “Quantity” column equals the current stock level of the material.
By clicking on “Material creation” you can adjust the initial stock level and price values you specified when first creating the material. By clicking on “Adjustment” you can also modify the value of that particular stock adjustment.