Depends on how one chooses to handle it. I simply filled out the form, checked off the appropriate box, explained on the back, and sent it in. Got the letter back a short time later saying the matter was closed and no further action was required on my part.

Other people I know called the Californian tax people, spent time on hold due to the usual and standard governmental bureaucratic inefficiencies, talked to a real live person explaining the situation, and had the matter dropped all the same.