(a) The requirements of §79.2402 of this title (relating to Liability) do not apply to a claim based on a voucher if DHS calculated and printed the claim amount on the voucher and submitted it for the provider's signature unless:(1) the provider gave DHS information to use in preparing the voucher that he knew, or should have known, was false; or(2) the provider failed to correct information he knew, or should have known, was false when given the opportunity to do so.(b) DHS allows a 30-day grace period during which the provider may correct errors in a voucher prepared by DHS without penalty.