(40 ILCS 5/20-128) (from Ch. 108 1/2, par. 20-128)
    Sec. 20-128. Payment of benefits. Two or more participating systems may agree to have the combined benefits paid by one of the systems, in which case, the system which pays the combined benefit shall receive from the other system, a lump sum payment equal to the actuarial equivalent of the proportional annuity determined in accordance with annuity tables which are acceptable to both systems.
(Source: P.A. 78-779.)