Minn. Stat. § 353.14: BENEFITS FROM OTHER FUNDS.

No annuity or benefit provided by this chapter may be affected, diminished, or impaired by any pension, benefit, or annuity which any member or survivor is entitled to receive from a tax-supported public retirement plan or system authorized by any other law based on service that is different service than the service for which the member or survivor is entitled to receive benefit or annuity from a retirement plan administered by the Public Employees Retirement Association.