Ideals in deformation quantizations over Z/pnZZ/pnZ

Let k be a perfect field of characteristic p>2p>2. Let A1A1 be an Azumaya algebra over a smooth symplectic affine variety over k. Let AnAn be a deformation quantization of A1A1 over Wn(k)Wn(k). We prove that all Wn(k)Wn(k)-flat two-sided ideals of AnAn are generated by central elements.