It may be the case that you need to answer the questions to check one of the boxes (yes or no) for the question on Line 17b before your address can be saved onto Line 17d. When looking at the Form, do you see one of the boxes marked as either yes or no next to the question "Are you the original user of the qualified energy efficiency improvements?"
If not, return through the interview questions (under Federal > Deductions & Credits) to answer this before moving on to Line 17d, the address.
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