The code is accurate because it was a trustee to trustee transfer. However, the full amount of the transfer is taxable income and added to the rest of your income to determine your total tax liability. There was no withholding on this which is good and can be bad. The good part is the full amount withdrawn was transferred to the Roth and you did not have to make up any difference for a withholding amount to make sure of a full transfer. The other good news is that there is no 10% penalty since the full amount withdrawn was rolled over.
The bad news is that because there was no withholding the full amount is added to your other income and it's quite possible, and based on your question, that there was not sufficient withholding from other earnings such as your salary to account for the additional income tax for this. Any regular 401(k) rolled into a Roth will be taxable funds because you did not pay tax on those funds in the past.
As indicated by xmasbaby0, you may be able to reduce any penalty, if applicable, by following the instructions posted, depending when the transaction occurred.
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