In case that there are serial number in incorrect status (due to returns or adjustments), the Store user should handle it as follows:
Go to Inventory >> Stock Management
Change the filter on top to "Active Items", Type the SKU in the text filter (or search by category/description)
In the results, Click on the Product link
The screen shows all serial numbers in the store. next to each one that requires status change, the user should change the status to available. This will update the Quantity available for Sale accordingly
Solution is for: MPOS Version 9.0