This might seem like a strange request, but there is no activity log in the flyout for budget items. I know that Locking it can prevent certain activities, but the budget items can still be unlocked and altered.
Why is there no Activity Log for the budget items? I want to know who added that budget item and when, who edited the Original Budget value after project start, who added the Forecast Adjustments etc. There are plenty of activities involving the individual budget items that could definitely benefit from an Activity Log.