My credits aren't displaying on supplier balance detail

Hi there, @susanf1. 

You can customise the supplier balance detail to display the credit. Let me show you how: 

1. On the left pane, select the Reports menu.
2. Find and select the Supplier Balance Detail report. 
3. At the top right, select Customise.
4. Click the Filter drop-down and mark the A/P Paid checkbox.
5. Click the A/P Paid drop-down, and select All. 
6. Hit Run report. 

From there, you can find the supplier credit under the TRANSACTION TYPE column. Another way to track the credit is to pull up the Transaction List by Supplier report. To edit it, hit the Customise button then click the arrow next to Filter. After that, select the Transaction Type drop-down arrow, then choose Supplier Credit. Finally, click Run report.

You can save the current customisation on the report, export and edit it in QuickBooks Online. For additional reference, you can check the following link: Memorise reports.

Let me know if you need something else. Wishing you and your business continued success.