When you use Accounts Receivable, you must choose a member in the Name field - I'm receiving this error even though I have added the correct member name

You get this error if you select the vendor in the name field, accounts602.

In QuickBooks Online, these entries need to be associated with a customer. You can only use the vendor's name if you post it to an Accounts Payable. If you use a vendor's name for an Accounts Receivable entry, you can add the vendor as a customer using a slightly altered name. Then, you can select this name when creating your journal entry.

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