My 1099-B has a code X sales total (non-covered securities, unknown holding period) - which option should I choose from the Sales Section drop down?

[JamesG1]

You may select Unknown term basis not reported to IRS at the Sales section title.

You will have to review your investment records and sales tickets to determine the proper date of purchase and/or date of sale.

[shinyknight]

That's the issue - there is no option "Unknown term basis not reported to IRS".  Closest I found was long-term, not reported, but that showed up as code E, not X.

[JamesG1]

"Unknown term basis not reported to IRS" as Sales section title is available 

 if the One by One method is selected at the screen Now, choose how to enter your sales.

@shinyknight