Welcome back to the Community, @mechanicalflower.

I appreciate you for following all the resolution steps provided by my peers and sharing the result.

You should be able to see the Total Credits Available for the transaction. Let’s view the transaction history for the bill payment check.

This is to check which transaction it’s applied to. With just a few clicks you can perform this task.

1. Go to the Vendors menu at the top to choose the Vendor Center.
2. From the list, click on the vendor’s name to open the Vendor Information page.
3. Tap the Transactions tab to see the bill payment check.
4. Right-click beside the entry to choose View Transaction History.
   
5. This will open a window showing the bill payment information.
   
6. In the Bills Paid section, check the bill and make sure it’s the right one.

If the entry showing in the Transaction History window is incorrect, void the bill payment check to unlink it.  The following guide provides detailed information when to remove a bill or payment check: Void or delete a bill or bill payment check.

Once don, recreate the transaction and apply it to the right bill.  If none of these suggestions work, I recommend you get in touch with our Technical Support Team.

They can access your company file and transactions in a secure space. Aside from that, our specialists have tools to help perform in-depth troubleshooting.

Once the resolution is available, they’ll guide you through the process on how to resolve the issue. Here's how to contact them:

1. Tap the Help section of the company file to see the contact details.
2. Select QuickBooks Desktop Help to open the Have a Question window.
3. Press the Contact us link to see the Contact Us screen.
4. Click the Search for something else link to enter the issue or topic in the field box.
5. Hit the Search button to display the Start a Message menu.

You can bookmark the Fixing Accounts Payable Errors in QuickBooks article for future reference. It contains tips on how to resolve account payable issues.

Please know the Community has your back. If you have any other concerns, post a comment below. I’ll pop right back in to assist further. Have a good one.