One of my statements in my last post about the new Aggregations tab was not entirely accurate...
I stated that to edit aggregations you would still need BIDSHelper, but as I have recently seen demonstrated and as a sharp eyed Greg Galloway has noticed - there is an Advanced View button which lets you do just that from within BIDS.
One of the interesting features it has is a status row that exposes the AMO warnings. There was a bit of a lag when I was testing it which meant that it was hard to tell exactly what had caused the error without hovering over the warning icon to get the list of errors. But to be fair I was clicking around fairly fast and you would probably be a bit more deliberate when adding/editing aggregations manually.
