It's great to see you in the Community, Jhoanna.
I'm happy to shed light on how the change of COGS and Income account works for inventory items, and we'll talk about your option.
By default, you will get a prompt with an option to affect the change in previous transactions or not when changing the income account of an inventory item. However, it’s not the case for the COGS account. If you change this, it will also affect the historical transactions.
Your option would be to create a new item with the new accounts. Then, you can inactivate the old one to prevent from using it in future transactions.
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If you have additional questions about changing the accounts of your items, please feel free to go back to this thread.