Ill. Admin. Code tit. 26, § 212.226
a) Definition:
2) Employees who have previous State service that qualified for earning of vacation benefits shall be given credit for that service, as determined by the Office or as required by law.
b) Interruptions in Continuous Service:
c) Deductions from Continuous Service: Except as provided in subsection (f), the following shall be deducted from, but shall not interrupt, continuous service: