Notwithstanding sections 1302, 1305, 1306, 1307 and 15693, after January 31, 2001, the procedure for approval of the annual budget of a school administrative district provided under sections 1304 and 1305 may be changed only in accordance with this section and section 1305-A. The budget validation referendum process provided in this section may not be adopted for use in a school administrative district unless the cost center summary budget format provided in section 1305-A is also adopted. A school administrative district using the alternative voting procedures established in section 1305 may reconsider that use only if as part of that reconsideration the voters adopt use of the cost center summary budget format provided in section 1305-A or the cost center summary budget format and the budget validation referendum process provided in this section. [2005, c. 683, Pt. A, §22 (AMD).]