I was recently drawing a schematic, and trying to work around the lack of an RGB LED by using 3 separate LEDs.
I tried to rename them to give them a more sensible name, in part because my understanding is that the naming of components in the schematic should indicate which components share a device (like slotting in gschem).
I was able to rename one, but renaming the second failed with this error:
There is already a component with the name “D1”!
Of course in this case the ideal fix would be to add more LED components to the library, but I think there are other uses for slotted or otherwise disjoint components, so it would still be sueful to fix this error.