On my 1099-R I do not have a box checked on line 2b. But, the form is requiring me to check one. What should I do?

[MayaD]

Box 2b. Taxable Amount Not Determined Enter an “X” in this box if you are unable to reasonably obtain the data needed to compute the taxable amount.

Box 2b. Total Distribution Enter an “X” in this box only if the payment shown in box 1 is a total distribution. A total distribution is one or more distributions within 1 tax year in which the entire balance of the account is distributed. If periodic or installment payments are made, mark this box in the year the final payment is made.

Instructions for Forms 1099-R and 5498