The software will not allow you to make an entry

Or

You have entered personal property taxes as a deduction on Schedule A Itemized Deductions and your refund has not changed?

Please clarify.

If you are itemizing and your refund has not changed, your State and Local Tax (SALT) deduction may be capped.  This TurboTax Help states:

Even if you itemize, the State and Local Tax (SALT) deduction, which includes property tax, is capped at $10,000 ($5,000 for couples filing separately).

The software does not let me entery numbers

To be clear, I believe you want to enter personal property taxes under Deductions and Credits.  These can be used as an itemized deduction on your federal return and in some states you can also use this expense.  If you are referring to your state taxes please clarify.

In your situation, you should first clear your cache and cookies. It handles many issues that seem nonsensical on a regular basis. 

• Close your TurboTax return first.

Watch to be sure you are selecting 'all time' as example.  Do not use selections like 'last hour' for those browsers that give  you options.

• How to clear your cache

Once this is complete open your return and select to enter your income. 

1. Search (upper right) type personal property taxes > Jump to... link
2. Begin your entry
3. See the image below.

@StarP

@StarP 

1)  IF this is the Desktop Software

and

2) If the field shows a $0 that won't allow an entry.

THEN

You have a Supporting Details (SD) sheet attached to that field.

Double-click on the box and the SD sheet should pop up for you to make the entry.

or...click on the "X" at the top of the SD sheet to get rid of it and then the regular entry field in the interview is freed up

Thank you - yes I had supporting documents that carried forward from last year double clicking let me update