I noticed this as well with AAL and some others.? Just using the basic twsactivex sample spreadsheet, it works e.g. "ADJUSTED_LAST" but only if the duration, in this case, is less than 8 Y, anything more and I get the error...? Which is weird, right?!? Because for others, if say 15 Y and IPO is in 2012, it just returns the data from 2012 on, no problem.