You’re in the right place for help, @Chris_Atlantic.
I can provide steps to fix your concern about applying credit to an invoice in QuickBooks Desktop (QBDT).
As per my replication, I was able to get the exact amount of the opening balance which is £966.40. In this, we can perform some troubleshooting steps to sort out this matter.
Nevertheless, let’s run the Verify Rebuild data tools in QBDT. This way, we can verify and resolve the most typical data errors in your company file. Also, kindly ensure that QuickBooks Desktop is updated to the latest release.
Here’s how:
- Go to Window, then Close All.
- From the File menu, click Utilities.
- Select Rebuild Data.
- Follow the on-screen instructions to back up your data.
- When the tool finishes, select OK.
- Go to the File menu, then click Utilities.
- Click Verify Data, then select Rebuild Now once QuickBooks finds an issue with your company file.
In addition, you can refer to this article when reconciling your account to keep it balanced and accurate: Reconcile an account in QuickBooks Desktop
Let me know if there’s anything else that I can assist you with. You can always tap me here to help you out. Stay safe!