I have the same problem. Every time I try to delete the form by saying "no" on the header page you mentioned, when I go back to say "yes" and enter the credits I'm claiming, the check box on enabling property is still checked (I didn't make enabling property changes this year) and I can't uncheck it (it won't let me leave the screen when I try). I also tried saying no to the "enabling property" initial question and go back to that screen again later, it's still checked and flagged as an error. Entering 0 for the value of it also doesn't work. My return has been rejected by the IRS because of this.
