Ind. Code § 3-11-1.5-32
The legislative body of a municipality may not change the boundary of a district established under:
(7) IC 36-5-2-4.2 ;
after November 8 of the year preceding the year in which a municipal election is to be held and before the day following the date on which the municipal election is held except to assign territory to a municipal legislative body district in an annexation ordinance.
As added by P.L.13-1988, SEC.1. Amended by P.L.5-1989, SEC.48; P.L.7-1990, SEC.39.