Is there any issue/concern in deleting an update set that has only been previewed--NOT--committed?

[johnthomas]

I retrieved an update set from our DEV instance to our PROD instance, but I think I want to do something different than what is in this update set.   I'd like to delete this update set on PROD (again, just previewed, not committed) so that it does not accidentally get committed.

I would just clone my PROD instance to my DEV instance to ensure the update set initially done on DEV is also eliminated.

[shafqat]

It is safe to delete an update set that has been previewed but not committed. Previewing an update set doesn't apply its changes to the environment; it only checks for potential conflicts and demonstrates what will happen if the update set is committed.