50 Ill. Adm. Code 4404.120
Forfeiture
Section 4404
Section 4404.120 Forfeiture
Transferred credit that is
not granted due to failure to pay the additional contribution
, if
applicable,
within the required time is lost. It may not be transferred to
another pension fund and may not be reinstated in the pension fund from which
it was transferred.
[40 ILCS 5/3-110(d)(5)]