Spent 2 HOURS on the phone to attempt to resolve this issue. The ultimate outcome of the phone call was to receive links to new TurboTaxBus software downloads for fed and VA. I really didn't believe a new download would accomplish anything so I did not install the "new" software (I'd already run the update feature anyway - I'm sure my install was current.)
Ultimately, after completing the Fed and VA returns in TTBus, I opened the "Forms" view and deleted schedule 502A. I verified that it had no impact on my primary forms being submitted for VA. After deleteing I was able to submit electronically to VA. Hope this helps you out, good luck.
