Crystal is a reader. It might be possible, but I would be highly doubtful. Why would you want the report messing with your data (this makes your reports non-reproducable, which means you never know what is right as you can't recreate it or you are doing extra work inserting bogus rows)
If the report is being run from an app, let the app take care of the updating/inserting.
and while I might be wrong, I have a feeling that you won't be able to perform an insert from crystal.