27 Miss. Code. R. 1-7-109
A request to modify an existing PSCRB-approved contract is to be submitted to the PSCRB at least 15 working days prior to a PSCRB meeting date which precedes the modification effective date. Any request for exception to this deadline must follow the same procedure as outlined in 7-105 (Deadline Exception Requests). Modifications shall not grant extra compensation, fee, or allowance to any contractor after service is rendered or contract is made, unless contemplated within the contract itself or unless the scope of services is increased. The extension of a contract is considered a modification wherein the specified contractual services have not been completed by the end date stipulated in the original terms of the contract. Modifications cannot be made to expired contracts.
27 Miss. Code. R. 1-7-109