Apologies if this proves to be an obvious answer, but I've been playing with this for a while, and suspect I'm misunderstanding something about ML Stuido. I've been playing with the Matchbox Recommendations Sample (found here). In order to see how the data manipulation worked, I removed the "Edit Metadata" step and tried to re-add it. My understanding is that this step simply changes the label of the field from Id to User:
However, after I remove and re-add it (and re-link it up):
The subsequent task (Select columns in dataset) is now in error, because it no longer recognised User:
Is this some quirk of ML studio (do I need to press a button or something to refresh it - I can't see anything obvious), or am I misunderstanding what should be happening here?