It depends. How did you report it as negative income? If you have excluded this in the federal return, that is not correct. If you strictly adjusted this in your state return, then this is correct.
Please verify and make sure your federal income reflects the foreign pension income while your NJ return does not. I only caution your approach because you said " I have added an extra line as a negative income for that amount (as I have done for the federal)" thus this suggests you may have reported this negative income in the federal return and this negative entry populated in your state return.
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