Follow the steps below to reactivate a Revenue Code.
Select Customer Setup > Codes... > Revenue.
Place a check in the Include inactive codes box.
Use the Search field to find the Revenue Code by the code or description. Or use the Show All button to view all codes.
Select the Revenue Code to reactivate.
Click OK when “This revenue code is currently inactive.” displays.
Uncheck the Make this code inactive checkbox.
Click Save.