Hello magimagss:
Thank you for your comments and your follow-up question.
In reply to that question, I respectfully believe that you are misreading the TurboTax screen, or at least the intent of the question. I've posted a screen-capture image (and attached it to my original answer) of what I believe you are seeing in the New Jersey TurboTax module. Please click to open the image, and re-read the highlighted text carefully.
If we look at that screen together, the program is actually asking us to input income here that is not already taken into account, or entered, elsewhere on the federal side of the program. In other words, if you've already created a Schedule E for your Polish rental property income in the federal TurboTax interview, then you will have nothing related to your Polish property to now enter here, separately, in the New Jersey interview. Thus, you can safely ignore this screen, as it pertains to anything regarding your Polish rental.
The income (and deductions) information from the federal side of the program will carry through to the New Jersey tax return . . . such that income taxable on your federal Form 1040 will also be taxable on your NJ-1040. This is consistent with the original answer.
Hopefully that understanding will help to alleviate your confusion, when taken in conjunction with the information given previously.
Thanks for asking about this and be well.
