The explanation for your query is already on the error message you stated, @Gulzira.
Whenever you click the drop-down menu under the Name column, you'll see an indicator if a certain account is a customer or a supplier.
For Creditors, you'll have to use a supplier for it. Here's an example screenshot:
For Debtors, you'll need to pair it with a customer. Take a look at this example:
As for the other accounts you need to use in your journal entry, I suggest you consult your accountant or bookkeeper on how to proceed. If you require assistance from a QuickBooks-certified accountant, you can find one from this page: Find an accountant.
Don't hesitate to leave a comment below if you have other questions about journal entries in QuickBooks Online, and I'll answer them for you.
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