It could be that your method needs a little adjustment. If you right click in a box on line 10 of Form 4797, you should see a pop-up window where you can select the option to override. Selecting override should allow you to enter the amounts you need to enter. When you override in order to enter amounts not only on line 10 but any other form in TurboTax, you will void the TurboTax guarantee. Thus, when entering information in this fashion, just double check that it is accurate.
While you may already know this, for securities traders who have elected mark-to-market accounting (Section 475(f) of the Internal Revenue Code) IRS instructions for Form 4797 provide that the security trader must attach a statement to their return using the same format as line 10, showing the details of each transaction. Moreover, the statement must separately show and identify securities or commodities held and marked to market at the end of the year. TurboTax does not support the creation or importation of the trader's statement. Thus, you will need to separately prepare your statement and attach it to your return. Your completed return will need to be paper mailed to the IRS.
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