A QUESTION ABOUT evaluation of two-dimensional Associative Arrays

Hello

This is Robin.

I'm learning about the package of Enterprisedb.

I wrote a package like:
CREATE OR REPLACE PACKAGE BODY pkg_test_d2
IS

TYPE t_d2_tab IS TABLE OF integer INDEX BY integer;
TYPE t_d2_arr IS TABLE OF t_d2_tab INDEX BY integer;

v_D2_Value t_d2_arr;
v_D2_Max integer DEFAULT 0;

PROCEDURE xxx(INOUT xxxx) IS
BEGIN
  ...
  cnt := 1;
  LOOP
   cnt := cnt + 1;
  IF XXX

   v_D2_Value(v_D2_Max)(cnt) := 0;
   END IF;
   ....
  
  

But it can not be excused.
I modified v_D2_Value(v_D2_Max)(cnt)  to v_D2_Value[v_D2_Max][cnt].
So it can be load in to database.
When the package be excused,an error occured.

I need a way to give a value to the variable v_D2_Value  directly,which like v_D2_Value(v_D2_Max)(cnt) := 0  .

Could you give me some advice please?

Best Regards