Stored DB Procedure - Need help

Question

Hi. I have a stored database package containing 2 functions. I need help with the function named ret_columns.
If you look at the code below you will see this function has two different FOR loops. The Select statement in FOR loop that is commented out works just fine, but when I try to use the uncommented select statement in it's place the Function returns NULL (or no records). However, if I run the Select statement in plain old SQL Plus it returns the rows I need. I don't get it.
Can anyone help me? I'm really stuck on this one.
-- PACKAGE BODY
CREATE OR REPLACE package body audit_table_info
as
function ret_tables return table_type is
t_t table_type;
i integer;
begin
i := 1;
for rec in (select distinct table_name
from all_triggers
               where substr(trigger_name,1,9) = upper('tr_audit#')) loop
t_t(i).tableA := rec.table_name;
i := i+1;
end loop;
return t_t;
end;
function ret_columns return column_type is
c_t column_type;
i integer;
begin
i := 1;
-- for rec in (select distinct table_name column_name
-- from all_triggers
--               where substr(trigger_name,1,9) = upper('tr_audit#')) loop
for rec in (select distinct b.column_name column_name
from all_triggers a, all_tab_columns b
               where a.table_owner = b.owner
                    and a.table_name = b.table_name
                         and substr(a.trigger_name,1,9) = upper('tr_audit#') and rownum < 5) loop                    
c_t(i).tableB := rec.column_name;
i := i+1;
end loop;
return c_t;
end;
end audit_table_info;
-- PACKAGE DEFINITION
CREATE OR REPLACE package Audit_Table_Info as
type table_rec is record( tableA all_tab_columns.TABLE_NAME%type);
type table_type is table of table_rec index by binary_integer;
function ret_tables return table_type;
type column_rec is record( tableB all_tables.TABLE_NAME%type);
type column_type is table of column_rec index by binary_integer;
function ret_columns return column_type;
end Audit_Table_Info;
/

Answer 1

It works when I do this!!! I'm so confused.
Ok...so I did this:
1 create table test_columns as
2 (select b.column_name
3 from all_triggers a,
4 all_tab_columns b
5 where a.table_owner = b.owner
6 and a.table_name = b.table_name
7 and substr(a.trigger_name,1,9) = upper('tr_audit#')
8* and rownum < 5)
SQL> /
Table created.
Then altered the Function so the Select statement refers to this table:
function ret_columns return column_type is
c_t column_type;
i integer;
begin
i := 1;
for rec in (select distinct column_name
from test_columns) loop
c_t(i).tableB := rec.column_name;
i := i+1;
end loop;
return c_t;
end;
Again, any help would be greatly greatly appreciated!