A Review Panel established under the Public Procurement and Disposal of Public Assets Act is bound by section 61(4) of the Public Procurement and Disposal of Public Assets (General) Regulations SI 5/2018 to confine its decision to issues raised by the parties in their submissions. A Review Panel acts ultra vires and irregularly when it raises mero motu an issue not raised by the parties and determines the matter on that basis. Review Panels are creatures of statute with limited powers, not courts of law. Section 77(1) of the Act confers only appellate jurisdiction on the Administrative Court, not review jurisdiction over Review Panel proceedings. The High Court retains its common law power to review administrative tribunals, codified in sections 26-28 of the High Court Act, which is not ousted by section 77(1). Applications for review under the procurement law must comply with statutory time limits (five days under section 74(1)(b)), and proceedings based on time-barred applications are legal nullities.