Compensation and Overtime: Maximum Accrual for Vacation/Sick Leave

My question involves labor and employment law for the state of: Oregon

Is there any federal or Oregon state law that limits the amount of sick leave or vacation an employee can accrue?

And, is there any law that addresses when a change in policy establishes a cap, how employees who are well over the cap are compensated (or not)?

Compensation and Overtime: Maximum Accrual for Vacation/Sick Leave