I had the same issue with Short Term Security so I have guessed how it works:
When you get to review this transaction 3 times screen will pop:
1. Holding Period applies only to a transaction reported on Form 1099-B
-For this you should select No Entry. This means there is no entry on 1099-B. If you specify Short Team / Long Term that means this is reported to IRS, but in this case its not as mentioned in your 1099-B.
2. Cost/Basis Not Reported applies only to a transaction reported on Form 1099-B
-For this you should uncheck this checkbox as its not reported to IRS and you are kind of figuring this number yourself, robinhood is not sure about this number.
3. Noncovered Security applies only to a transaction reported on Form 1099-B
-For this you should uncheck this checkbox as you are covering it by reviewing it
-After making above 3 changes it worked like a charm for me.
I have seen this happening at time of Reverse Stock Splits to me. Suppose you have 122 stock of some company and reverse split is happening for 20 to 1. So you will have 6 stocks + 2/20. So to avoid this situation before reverse split make sure you have stocks in the multiple of 20, to avoid this situation in future. So here in the example either you can but 18 stocks or sell 2 stocks before reverse split date.
Hope this helps. Enjoy!!!
