How to initialize a Type Object??

Hi,
I have a procedure as below, which has type t_r_rep_data and a table having this type as record, but when I called this procedure, it has ORA-06530 error: Reference to uninitialized composite. Can you tell me how to initialize a type Object?
Also, is it this the right way to insert a type record into the table, or can I just just INSERT statement?
Many thanks
PROCEDURE add_row
( in_row_type_ind CHAR,
in_ordering VARCHAR2
,in_record_type VARCHAR2
,in_level1_value VARCHAR2
,in_level1_description VARCHAR2
,in_level2_value VARCHAR2
,in_level2_description VARCHAR2
,in_level3_value VARCHAR2
,in_level3_description VARCHAR2
,in_level4_value VARCHAR2
,in_level4_description VARCHAR2
,in_amount_as_of_date1 NUMBER
,in_amount_as_of_date2 NUMBER
,io_table IN OUT t_ntr_rep_data
IS
l_row_count NUMBER;
l_row t_r_rep_data;
BEGIN
-- ??? not sure where and how to do the initialization bit
l_row.row_type_ind := NULL;
l_row.ordering := NULL;
l_row.record_type := NULL;
l_row.level1_value := NULL;
l_row.level1_description := NULL;
l_row.level2_value := NULL;
l_row.level2_description := NULL;
l_row.level3_value := NULL;
l_row.level3_description := NULL;
l_row.level4_value := NULL;
l_row.level4_description := NULL;
l_row.amount_as_of_date1 := 0;
l_row.amount_as_of_date2 := 0;
SELECT COUNT(*)
INTO l_row_count
FROM (TABLE(CAST(io_table AS t_ntr_rep_data)));
l_row.row_type_ind := in_row_type_ind;
l_row.ordering := in_ordering;
l_row.record_type := in_record_type;
l_row.level1_value := in_level1_value;
l_row.level1_description := in_level1_description;
l_row.level2_value := in_level2_value;
l_row.level2_description := in_level2_description;
l_row.level3_value := in_level3_value;
l_row.level3_description := in_level3_description;
l_row.level4_value := in_level4_value;
l_row.level4_description := in_level4_description;
l_row.amount_as_of_date1 := in_amount_as_of_date1;
l_row.amount_as_of_date2 := in_amount_as_of_date2;
io_table(l_row_count+1) := l_row;
END;
--------------------------------------------------

Simply write a stud which queries the Oracle Dictionary tables which will return Object Type
Based on the object_name and User_name

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