module toplevel {
    defparam myPole.offset = 95;

    pole myPole();
}

module pole {
    parameter offset = 0; // default value, overwritten by 95

    localparam x = 1;
    localparam y = 2;
    localparam z = 3;
    localparam maxLength = 100;

    localparam transitionConst = x + y + z + offset; // total is 101, this works as expected

    if(transitionConst > maxLength){
        transitionConst = transistionConst - maxLength;
    } // transitionConst should wrap around 100, and be left with 1
}