It means that if you want to sort things, you shouldn't merge cells.

In general the advice of the experts (and others) on these groups is don't
merge cells if you can find an alternative solution.
--
David Biddulph

"ChrissySher" wrote in message
...
This operation requires...the merged cells to be identically sized

This statement comes up when I try to sort Alphabetically, what does this
pop-up mean??