INDIANAPOLIS (AP) — The Indiana Department of Education is reviewing whether A-F performance grades to schools could be canceled this year because regulations on setting those grades have expired.

Democratic state schools Superintendent Glenda Ritz has been an opponent of the rating system — and its supporters say she is trying to undermine the process.

The (Fort Wayne) Journal Gazette reports that an Education Department document it obtained says the agency faces legal issues in calculating new A-F grades because the system’s administrative rules expired last November. A department spokesman says it has asked the state attorney general’s office for a legal opinion.

State Board of Education member Cari Whicker says Ritz has tried several times to negate the grading system and called the regulations question “a stretch.”