(750 ILCS 22/612)
    Sec. 612. Recognition of order modified in another state. If a child-support order issued by a tribunal of this State is modified by a tribunal of another state which assumed jurisdiction pursuant to the Uniform Interstate Family Support Act, a tribunal of this State:
        (1) may enforce its order that was modified only as
to arrears and interest accruing before the modification;
        (2) may provide appropriate relief for violations of
its order which occurred before the effective date of the modification; and
        (3) shall recognize the modifying order of the other
state, upon registration, for the purpose of enforcement.
(Source: P.A. 99-119, eff. 1-1-16.)