Error in Customers screen: A Duplicate Customer Name is not allowed.
We've experienced this error after the Customer Name Change utility has been used on a customer and a trailing (blank) space was appended to the end of the name. It's difficult to notice because a lot of screens truncate the trailing space from view.
That said, there is a work-around that generally clears this up. Please open the Customer Name Change utility again and choose this particular customer. Then, change the customer name to something temporary (maybe even the customer name with a '2' appended at the end). Then, change it back. In other words, just transfer the customer name into a temporary name and back again to "refresh" the name. This should remove that blank space and correct the error.