Appellant sought appellate review of this dismissal in the Commonwealth Court. Commonwealth Court affirmed the Board's refusal to allow him to appear before it, holding that his claim was barred by res judicata and his request for an administrative hearing on the method of computation was unnecessary. O'Brien v. State Employees' Retirement Board, 12 Pa. Commw. 49, 315 A.2d 899 (1974). In denying appellant's request for an administrative hearing, the court held determination of the amount of appellant's pension, following Dauphin County Court of Common Pleas' September 8, 1970 decision, was a mere matter of mathematical computation, not adjudicatory in nature, and therefore not of the type for which a hearing is required.