Yes, I just found it and you need to enter Code 12 on Line 2 of Form 5329.
I was thinking about this yesterday, and I try not to answer questions that are not asked, but here, hold my tea.
If this is a new client (and you don't have prior year returns), I would suspect that this client made withdrawals from this account in the past and forgot to tell you. I say that because almost all my folks hold mutual funds in these accounts, and the market has been going up since March 10, 2009 or thereabouts. Not straight up, but up. I am wondering how he managed to lose money. I do know that some people defy the odds and pick exactly the wrong day to withdraw funds, or he may have invested in a loser. You said he contributed in "prior year," and I'm not sure that's "a" prior year, or "the" prior year. So, just thinking out loud, and never mind, carry on.