Though the IRS has done away with this deduciton, many states have not.  So you need to be sure to get the input done for the purposes of determining state itemized deductions.  I have not done any yet (focused on Business Returns), but this was made clear in the tax reform training I have completed.  You might backtrack from the State Forms, or simply input directly and bypass 2106 (Sch A Scr 25 in Lacerte).