Follow the steps below to reactivate an Inventory Code.
Select Customer Setup > Codes... > Inventory.
Place a check in the "Include inactive codes" box to include inactive inventory codes in your search results.
Use the Search field to find the Inventory Code by the code name or description.Or use the Show All button to view all codes.
Select the Inventory Code you want to reactivate.
Click OK when the “This inventory code is currently inactive.” pop-up displays.
Uncheck the Make this code inactive checkbox.