I received a lump sum IRA distribution from a deceased relative, I had state and fed taxes taken out. what do I put down for source of dist.?

She was over 80 and never took any money out. when I go to file I receive this "Box 12a for electronic filing, NYS withholdings can not be greater than or equal to gross distribution or state distribution. I can't even find a box a on the 1099-R