Section 992.13 - School debts validated(1) Any debt incurred by any school district prior to May 17, 1923, for a lawful purpose and within the constitutional limitations, in pursuance of proceedings taken at a lawful meeting, is hereby declared the legal, valid, and binding obligation of such school district and refundable by loans from the state trust funds, notwithstanding the failure of such school district to conform to the statutes governing municipal borrowing and municipal loans.(2) Notes issued before August 3, 1961, by school districts under the authority of s. 67.12(12) and without approval thereof by the electors of such school districts shall not be deemed invalid because of absence of such approval, and such notes are herewith declared to be valid and binding obligations of such school district if in all other respects issued in accordance with the law pertaining thereto.(3) Any bond or promissory note issued by a school district after August 8, 1989, and before September 4, 1991, without the approval of the electors of the school district at a referendum shall be legal, valid and binding, and the school board may spend the amount raised for the purpose stated in the authorizing resolution, notwithstanding the failure of the school board to obtain the approval of the electors at an annual or special meeting of the school district.1991 a. 49 ss. 8, 10, 11.