Does engraving an iPod cause damage or malfunctioning down the road?

I read somewhere engraving an iPod has caused eventual problems/malfunctioning. I’m actually not all that crazy about having anything engraved on the back, even though it’s free, so if there’s any truth to this I just won’t get it done.

This is for a 4th gen iPod nano. Anyone out there had trouble with theirs and think it might be due to engraving?