All these statements are incorrect:
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Journal entries definitely affect both inventory quantities and account balance. The only difference between a journal entry involving an inventory item and any other inventory transaction is that quantities are not multiplied by unit prices to obtain amounts. Instead, the total debit or credit amount must be input directly. A journal entry can adjust quantities, value, or both.
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Inventory write-offs can be used only for inventory reduction. Negative numbers in write-offs are ignored.
At the present time, write-offs are the designed method for non-revenue inventory reductions. Journal entries are the only method for non-revenue inventory additions. The ability to enter inventory adjustments in both directions has been on the ideas list from the beginning: Inventory Write-off tab modifications.