Any income, gains, or losses realized or unrealized on each separate account shall be credited to or charged against the amount allocated to such separate account without regard to the other income, gains, or losses of the company. However, a variable annuity contract on a group basis or a variable accumulation annuity contract on a group basis may provide for the interdependence of two or more separate accounts established in conjunction with such contract.
31 Pa. Code § 85.23