The only way to resolve this error was to create a support ticket and have the support team assist. Even if I had seen this previously, I couldn't have done it without their assistance.
Yeah, I tried that as well, but no joy.
It appears that their single character barcode is malformed as it isn't recognized by even the one-click index engine.
Research has shown that others have had issues with single digit barcodes, but, that it is possible.
Oh well, the workaround seems to be working flawlessly.