Deductions & credits

P.S.
If I go to my Schedule A form, on line 2a "Real estate taxes paid on principal residence NOT entered on Form 1098" there is an entry of $9,454, and on line 2b "Real estate taxes paid on principal residence entered on Home Mortgage Int. Wks" is an entry of $9,454.  

This $9,454 does NOT show up on my Form 1098, and couldn't find my Home Mortgage Int. Wks.

Which line entry do I remove (2a or 2b)?