Md. Code Regs. 21.07.03.24
"Any proposal for terms in addition to or different from those set forth in this purchase order or any attempt by the Contractor to vary any of the terms of this offer by Contractor's acceptance shall not operate as a rejection of this offer, unless such variance is in the terms of the description, quantity, price or delivery schedule, but shall be deemed a material alteration thereof, and this offer shall be deemed acceptable by the Contractor without the additional or different terms. If this purchase order is an acceptance of a prior offer by the Contractor, the acceptance is expressly conditioned upon Contractor's assent to any additional or different terms contained herein. The Contractor understands and agrees that the terms and conditions of this purchase order may not be waived."
Md. Code Regs. 21.07.03.24