The error messaging you are seeing with regard to the wash sale entries is a result of automatic rounding of the number imported from your broker or typed in by you. If the wash sale adjustment is $0.49 or less, then it is automatically rounded to zero. This type of rounding is allowed by the IRS. Unfortunately, zero is not a valid value for this field -- thus the error message.
To resolve the issue, you can edit each individual transaction (although not from the screen in the review process) and delete the amount entered in the wash sale adjustment if it is $0.49 or less. This will clear the error message.
To do this, you will need to revisit the input section for the Form 1099-B transactions. Use the following steps:
If you have too many transactions that would require editing, you can consider deleting your imported information and entering a summary of the different categories of transactions reported on your Form 1099-B (short-term covered, short-term not covered, long-term covered, long-term not covered). This would require you to mail a copy (not the original) of your Form 1099-B from your brokerage to the IRS within three days of filing your return. The Form 1099-B would be attached to Form 8453, which will print with your return.
My downloaded TurboTax Home and Business doesn't have a search box in the upper right corner, or anywhere else that I can find. In any case, how can I edit a 1099b form imported from my broker?
Below is a picture showing you where to look for the search box.
If that does not work, go to the Personal > Personal Income > I'll Choose What I Work On > Investment Income > Stocks, Mutual Funds, Bonds, Other section of your return to edit the transactions that were imported by your brokerage account.
You will be editing the individual transaction that includes the wash sale amount less than $0.50.