No angel still iam not clear.
Actually iam having only one Refresh group with multiple snapshots o.k.Means after making changes to these snapshots when i manually Refresh the Refresh group if any of the snapshots are having errors as per your version all the operation should be Rollback o.k.But what i observed is i lost all changes that are made at the snapshot site and the data now at Snapshot site is similar to the Master site before update.
regards
akhadar