For purposes of determining the single life annuity benefits provided for in section 5702(a)(4) of the code (relating to maximum single life annuity), if any, the benefit shall only be attributable to regular member accumulated deductions, irrespective of any contributions which the member may have made on behalf of the employer as well as any accrued interest applicable thereto for creditable nonstate service.
4 Pa. Code § 247.2