To reduce the cost of a unit:
1. go to Inventory, Units, Update, Non-AP Unit costs
2. enter the unit id of the unit
3. enter the date of the cost adjustment (this will determine what fiscal period the GL transaction posts to)
4. enter or select the appropriate writedown cost code for the type of unit you’re adjusting
5. enter the amount to reduce the cost by, as a negative number.
6. Check that the total cost is now the amount that you want, and Submit.