Wis. Stat. § 881.03

Nothing contained in this chapter shall be construed to affect the power or jurisdiction of any court of the state of Wisconsin in respect to trusts and trustees, nor as restricting the power of a court of proper jurisdiction to permit a fiduciary to deviate from the terms of any will, agreement or other instrument relating to the acquisition, investment, reinvestment, exchange, retention, sale or management of fiduciary property.