I followed all directions in search for how to delete an accidental entry here. It deleted the Sales of Business Property under Income, however when I get to the end and try to file, it says I need to upgrade because I have "Sales of Business Property Form 4797". But it's gone.
You can see if the Form 4797 is still in your program and if so delete it as follows:
1. Choose the Tax Tools option on your left menu bar
2. Choose Tools
3. Choose the Delete a form option under Other Helpful links
4. Find the Form 4797 in the list of forms and delete it