Honestly, I think that is really a question for your BK attorney. I'm sure you could get several opinions here on this forum, but the only way to be absolutely sure is to verify that with your attorney.
We filed for BK in 2002, and our attorney told us that we had to list each and every creditor, and that if they were not listed on the court petition, then we were still liable for the debt.
So, my opinion is that if you accidentally left someone off your BK petition then you need to pay that debt or have your BK revised to add that creditor. But again, this is really a question for an attorney.