oracle存储过程中if嵌套

if (v_compute_form = 1) then
      current_fee := v_square * price; --本月费用
      if (v_overdue_flag = 1) then
        overdue_fine := previous_fee * 5 / 10000; --滞纳金
      end if;
elsif (v_compute_form = 2) then
      current_fee := record_count * price + v_plan_count1 * extra_price1 + v_plan_count2 * extra_price2 ;
end if;