Do I enter the actual amount I contributed to a PA 529 Plan in 2017, which exceeds the annual maximum, or do I enter the maximum allowable contribution?

I contributed more than the annual maximum into my dependent's PA 529 plan in 2017.  Turbo Tax lets me enter the higher value and does not warn me that the value exceeds the annual maximum.  I don't want to miss out on a potential refund, so do I enter the actual amount contributed or do I enter the maximum allowable contribution?