Hi there, @Mary512. I'm here to ensure we get this sorted out.

A part of your QuickBooks Desktop data may have been damaged. This causes the program not recognizing the closed sales order properly. You can run the Verify/Rebuild tool. Verify will detect any damaged data. Rebuild will attempt to fix the damaged data detected. It also allows your QuickBooks software to refresh the data inside the company file.

Make sure to create a backup copy of your company file before doing the Verify and Rebuild process. If there are changes that occur, having a backup copy allows you to restore it to undo the changes.

Follow the steps below on how to verify data:

1. On the top menu, click File.
2. Choose Utilities.
3. Select Verify Data.
   
4. Click OK when you see the message, QuickBooks detected no problem with your data.
5. If Verify finds an issue with your data, you'll be prompted to Rebuild Now or View Errors.
6. Click Close or View Errors and take note of the specific error message.

Next, here's how to rebuild data:

1. On the top menu, click File.
2. Choose Utilities.
3. Select Verify Data.
   
4. Click OK if you receive a prompt to back up your company file.
5. Click OK when you get the message, Rebuild has completed and proceed to the next step.
6. Run Verify Data again to make sure there's no error.

Then, update your QuickBooks Desktop to the latest release from our official website. 

1. Go to the Downloads & Updates page.
2. Select the country, product, & version and click the Search button.
3. Click the Get the latest updates link.
4. After downloading the updates, navigate to the Downloads folder of your computer. Double-click the update file to initiate the installation process.
5. Follow the prompts on the screen to install the updates.
6. Restart your computer after the update is installed successfully.

I've also included here a guide on resolving any possible data issues: Fix data damage.
 

If you have QuickBooks Desktop Enterprise, I'm sure you'll find this article helpful in managing your sales order: Fulfill a Sales Order.

Please let me know how it goes or if you have any follow-up questions. I'll be here if you need further assistance. Just leave a comment below.