Fill out the Form 4684 worksheet, making sure you check the box on line 4e.  Once you do that, it will work.  The Schedule A will print the total standard deduction, including the casualty loss, on line 16 with text that says "See Schedule A, Line 16 Statement".  The statement will show the Net Qualified Disaster Loss and the regular standard deduction and then will total them, equaling what is shown on Schedule A, Line 16.