I have some column names that are at or close to the max character limits and I've noticed that if I try typing in the formula with brackets, the references aren't recognized. I then would have to select the cell for each reference. Another work around I've found is to copy a valid formula and just replace the reference.
For example, below is a formula I'm using. I can type in [Max Duration Qs Form]@row and the formula recognizes the reference and color codes. But if I type in [Max Duration Q4 - Benefit Commencement Date]@row, the formula doesn't color code this section and if I finished the formula out, I get an #UNPARSABLE error.
=IF([Max Duration Qs Form]@row = 1, IF([Max Duration Q4 – Benefit Commencement Date]@row = "01/08/17", "Correct", "Incorrect"))