TurboTax tells me "VA Deductions statement code 115-Amount; ABLEnow Contributions cannot be greater than $2,000 for people under age 70." Where is that written?

Under the VA state return, I contributed $15,000 in 2018 to an ABLEnow account, the maximum allowed.  I don't see anywhere in the ABLEnow literature that "ABLEnow Contributions cannot be greater than $2,000 for people under age 70.".