Personal property taxes are part of the SALT tax deduction (state and local taxes), which is capped at $10,000. These are included as itemized deductions on Schedule A of your return. The limitation may be the reason for the message stating the entry will not affect your deduction.
Did you import a prior year return? If so, you may have some information pulling forward as supporting details that may be affecting your ability to make an entry. Please see the following thread with suggestions on how to resolve this issue:
Entering Property Taxes in TurboTax
@michaelpmassagli
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