Oregon Revised Statutes Public Officers and Employees § 236.620

(a) If the employee was serving a probationary period with the employer at the time of transfer, the past service of the employee on probation shall apply on the regular probation requirements of the receiving employer.

(b) Notwithstanding any other provision of law applicable to a retirement system for employees of the prior employer or of the receiving employer, but subject to subsection (2) of this section, the employee at the option of the employee may elect to continue for 12 months under any retirement system in which the employee was participating prior to transfer or, if the employee meets the qualifications therefor, the employee may elect to participate in the retirement system available to employees of the receiving employer. The employee's election shall be in writing and made within 30 days after the date of transfer. If the employee elects to continue under the retirement system in which the employee was participating prior to transfer, the employee shall retain all rights and be entitled to all benefits under that system, the employee shall continue to make contributions to that system and the receiving employer shall make contributions on behalf of the employee to that system as required of employers participating in that system, as if the transfer had not occurred.

(c) The employee shall retain the seniority the employee accrued under prior employment, but no regular employee of the receiving employer shall be demoted or laid off by reason of that seniority at the time the transfer occurs. Thereafter, the employee's seniority from the transferring employer shall be regarded as seniority acquired under the receiving employer.

(d) The employee otherwise shall enjoy the same privileges, including benefits, hours and conditions of employment, and be subject to the same regulations as other employees of the receiving employer.