Since the IRS allows you to round to the nearest dollar, amounts under $0.50 could be considered as zero.
If TT is not allowing you to enter zero for the adjustment, then I'd just not enter the adjustment at all.
I can't give you legal advice, but if I could, I would absolutely guarantee you that if you don't intend fraud, the IRS will not send a SWAT team to your house to find out why you didn't report a 30-cent adjustment.
