Adrian,

Thank you for your input.  I did the verify and rebuild steps you suggested and there was one error but it had nothing to to with this project.  I backed it up and did the rebuild function and it successfully rebuilt it.

I went and opened up the sales order and it still shows, "Invoiced in Full" and the "Mark as Closed" is the only button there and it is greyed out.

Do you have any other suggestions?

Thanks