Manage Customers and income

Your efforts in performing the suggested resolution is valued, Clio. I'll be here to ensure you'll be able to save the supplier credit successfully. Let me share some information first to provide context and help you understand the process better. 

QuickBooks Online (QBO) restricts the direct use of an Accounts Payable (A/P) account in a Supplier Credit transaction. The reason for this is A/P is specifically designed to monitor unpaid bills or invoices you're obligated to pay. On the other hand, a Supplier Credit transaction represents money you owe, which can be applied to reduce the amount you owe on future invoices or bills from the same vendor. These two functions serve different purposes in tracking your financial obligations.
 

In line with situation, you'll need to use the same account as the one you utilized when you recorded the associated bill. I'll add an image for visual references.  
 

Finally, you can refer to these articles for insights on pulling up financial data with your supplier totals and handling any prior balance you need to pay:

• Run a report with supplier totals in QuickBooks Online
• Manage outstanding balances for suppliers in QuickBooks Online

Come back to this post if you have more questions about processing vendor-related topics, Clio. I'll be here to ensure you can get help you deserve. Whether you're dealing with complex supplier transactions, managing multiple suppliers, trying to optimize your account payable process, don't hesitate to share them in the comments section below.