I believe the basic problem is that I have not found any where in the literature where it is noted that the fills, intros, and endings have different characteristics than other measures in a sequenced song. And, that the "Erase Measure" function set to "All" does indeed not do what it is supposed to do.
Lacking an adequate operating manual, we can only suppose that when a function is labeled "Erase Measure", it should erase any measure.
Great keyboard.
Short changed on documentation!
Just my thoughts,
Walt