I appreciate you for following the steps above, @Evia. Let me share a few details about adding a service item in Journal Entry in QuickBooks Desktop (QBDT).

Journal Entry (JE) is used to correct an account. We should only use this as a last resort for entering transactions. I suggest using it only if you have an understanding of accounting or if you are following the advice of your accountant.

As my colleague ChristineAnn has mentioned, there is no option to edit Journal Entry items in QBDT yet. However, if you need to add service items, we can create different types of transactions such as Bills, Invoice, or Sales Receipt. On the other hand, if you need to edit an item, we can delete and recreate these transactions. 

Moreover, if you've encountered errors while importing files, I recommend checking out this article: Improved IIF Import in QuickBooks 2019 and later.

Furthermore, see this article for more information about the IIF import and export limitations in QBDT: Export, import, and edit IIF files.

Let me know if you have additional questions about the JE in QBDT or any QuickBooks-related concerns. Keep safe.