Under
Art. 12(2) RPBA 2007, the statement of grounds of appeal and the reply must contain a party's complete case and should, inter alia, specify expressly all the facts, arguments and evidence relied on. Under
Art. 13(1) RPBA 2007, the boards have discretion to admit and consider any amendment to a party's case after it has filed its grounds of appeal or reply. This discretion must be exercised in view of, inter alia, the complexity of the new subject-matter, the current state of the proceedings and the need for procedural economy.
Art. 13(3) RPBA 2007 adds that amendments sought to be made after oral proceedings have been arranged may not be admitted "if they raise issues which the Board or the other party or parties cannot reasonably be expected to deal with without adjournment of the oral proceedings".