Schedule SC - Massachusetts Septic Credit Issue

I thought I would give this a try! State of MA: Turbo Tax indicated that I had Unused Septic Credits for 2015, 2016, 2017 @ $1500/yr. So I continued with Interview and with TTax filling out Line 1a/1b it determined that I had a $47 Septic Credit? When doing Smart Check the only error in State was for Schedule SC Line 1a: "Line 1a must be a compliant Tax Year"? Well the year septic was installed was 11/08/2013: I'm aware that the Date is quite old but Turbo Tax is requesting me to fill out and submit! I can't change the Letter of Compliance date nor can I delete the Schedule SC. It reappears each time I run Smart Check producing the same Error.