Thanks for joining the thread, @GiuliettaM.

Happy to provide some additional insight into why you're seeing to entries when doing an inventory adjustment. As my colleague mentioned previously, the second entry with no amounts represents the change in your inventory quantity, while the other is the change in value of the inventory. Quantity represents the number of on hand product you have, while value is the dollar amount of the on hand product you have.

For more information on inventory adjustments in QuickBooks Online, you can check out: Adjust inventory quantity on hand in QuickBooks Online

Let me know if you have any other questions. I'm here to ensure your success.