Jim - Yes, I ran into this problem in July when I bought my DG-300 and
wanted to take my AC-4 off flying status while I tried to sell it.

(Its still for sale, BTW... I flew the DG so much I didn't take any
time to sell it! $10k OBO - I got a great deal on it when I bought
it, and just need enough money out of it to complete a down-payment on
my first home this winter.)

--Noel