How do I select a customer when using Recievables as a line item in general journal enties?

You can pick a customer from the names list in the name column on the journal.

When using QB AR the normal way, it's rare to use Journals, and can cause various unwanted side effects. So, as you do this be sure to test reports and such to make sure you're getting the expected results.

Hi josh-cpatrick,

You'll want to select a customer by clicking the drop-down arrow when recording a journal entry. Let me guide you how.

1. Go to the Company menu, then select Make General Journal Entries.
2. Fill out the fields to create your journal entry. Make sure your debits equal your credits when you’re done.
3. Under the Name column, click the dropdown arrow to select a customer.
   
   
4. Click Save & Close.

You can also receive copies send by your accountant so you can add them to your books: Import Journal Entries From Your Accountant.

For future reference, you can run the reports in QuickBooks Desktop: View The Transaction Journal Report in QuickBooks Desktop.

Fill me in if you need anything else. I'll be here to help. 

I am trying to make a journal entry to clear a stale negative bill balance from a vendor.  The entry is attempting to credit A/R and Debit my miscellaneous expense line.  But even though I have selected the vendor name in the dropdown "Name" column, I am still getting the message that A/R Transactions must include a customer.

Why?  I checked the vendor record and it is not flagged as inactive.