I'm preparing a NY state return and noticed that in IT-196 (NY itemized deduction) line 16a is left empty. Per IT-196 instruction that line should contain the amount of cash charitable contributions elected as qualified contributions:

"If you claimed an itemized deduction for gifts to charity by cash or check on your federal income tax return, enter the amount of any contributions, included in the total amount reported on federal Schedule A, line 11, that you elected to treat as qualified contributions."

This value in this field affects the final calculation for allowed itemized deduction. Where can I make the election to treat cash charity contributions as qualified contributions?