When you have a report with relative dates, it would be really great to be able to change the base column and let all the other columns (relative dates) update from it. It seems to me this would be THE whole point of having a "relative dates" feature - for versatility!
But for most reports I've worked with, if you try to change the date on the 'base' column, you get the error "column is referenced by other columns and cannot be changed".
It seems like it should be a pretty easy fix to allow the user to change this base date, and let all the other dates update relative to that. If you're worried about the user doing this not realizing it's a base column for relative dates... why not keep the pop-up, but just make it a warning instead of a hard limitation? Doesn't make sense to me.
This feature would save me a lot of time.