As far as I can tell the process is still the same, and works in 9.3
When you are going through the process, and get to step 6. Can you confirm that the field 'Is Healthy' doesnt have an exclamation mark on it.
Also, if you were to create a new Data source (with this field in it) and publish to the server, do you see the same issue?
Glen, thank you for the reply. When I returned to the office this morning it just worked. I suspect that it has to do with our SQL Server Always On Availability Group (AAG). It's possible that the changes I made to the primary database were not being published to the secondary databases on a timely manner. I can't confirm this but it is my current theory. I'm just glad that it works now.