Couldn't find a straight answer looking through the docs, but I assume that this is still unsupported. Is this correct?
Unfortunately, the Table Lookup DR doesn't support the UpdateValues method. You can see this by using AFDataReference.SupportedDataMethods call. It also doesn't support the SetValue method as can be seen in the screenshot below.
If you are trying to update your AFTable programmatically, I would suggest you to use the AFTable class in AF SDK directly instead. Please refer to this link for more information.
It basically involves extracting out the ADO.NET Table, edit it, and then set it back in.
Retrieving data ...