Thanks for dropping your concern here in the thread, @Twambi. Let me share some information regarding using an Account receivable or Account payable in one journal.
You cannot use two or more A/R or A/P in one journal in QuickBooks Desktop (QBDT). It is to avoid issues in maintaining the account records and to ensure that the transactions are categorized and reported. If transactions were allowed to contain multiple A/R or A/P accounts in one journal, it would be challenging to determine which accounts should be credited or debited, leading to potential errors in financial reporting. However, if you're using QuickBooks Online (QBO), you can have more than one A/R or A/P transaction within one journal.
To offset the balances in QBDT, you can have a clearing account to record the transactions and make a separate journal entry to put the correct amounts in their accounts. This way, it will make sure that the transactions are recorded successfully.
On the other hand, you can check out this article as your guidance with handling your transactions inside QBO and QBDT:
You can reply to this post for more questions about managing your transactions using QuickBooks. I'm happy to help. Have a good one!