Cal. Gov. Code § 20635.1
Notwithstanding Section 20635, and Section 45102 of the Education Code, when the compensation of a school member is a factor in any computation to be made under this part, there shall be excluded from those computations any compensation based on overtime put in by a member whose service retirement allowance is a fixed percentage of final compensation for each year of credited service. For the purposes of this part, overtime for school members is the aggregate service performed by an employee as a member for all school employers and in all categories of employment in excess of 40 hours of work per week, and for which monetary compensation is paid.
If a school member concurrently renders service in two or more positions, one or more of which is full time, service in the part-time position shall constitute overtime. If two or more positions are permanent and full time, the position with the highest payrate or base pay shall be reported to this system.
Ca. Gov. Code § 20635.1