Add hidden fields in ALV

Hi all,
 I wanna add a new field in ALV field catalog, so that when user choose function Change Layout to decide which fields are showed, they can choose the new field.
In orginal source, the ALV uses field catalog from structure LIPOV. And the field I wanna add is just a normal text field (char15, for example) and its data will be extracted from a select statement.
So, Here is the logic of report:
data: ls_fieldcat type slis_fieldcat_alv.
call function 'REUSE_ALV_FIELDCATALOG_MERGE'
 exporting
 i_internal_tabname = 'itab_data1'
 i_structure_name = 'LIPOV'
 i_client_never_display = 'X'
 changing
 ct_fieldcat = ct_fieldcat[]
 exceptions
 inconsistent_interface = 1
 program_error = 2
 others = 3.
After this call, i add new field
 ls_fieldcat-col_pos = 110. " above function will retrieve a field catalog with 109 records
 ls_fieldcat-fieldname = 'new_text_field'.
 ls_fieldcat-tabname = 'itab_data1'.
 ls_fieldcat-seltext_l = 'NEW'.
 ls_fieldcat-no_out = 'X'.
 APPEND ls_fieldcat to ct_fieldcat .
 clear ls_fieldcat.
Here, I copy all data from itab_data to itab_data1
Display:
 call function 'REUSE_ALV_LIST_DISPLAY'
 exporting
 i_buffer_active = 'X'
 i_callback_pf_status_set = gf_status
 i_callback_user_command = gf_user_command
 i_structure_name = 'LIPOV'
 is_layout = gs_layout
 it_fieldcat = ct_fieldcat
 it_events = lt_events
 it_sort = gt_sort
 is_variant = gs_variant
 tables
 t_outtab = itab_data1
 exceptions
 program_error = 1
 others = 2.
Please note that there are something special here:
Originally, ALV displayed with internal table itab_data.
The new filed is a part of internal table itab_data1.
And the problem is:
When I choose Change Layour (Ctrl F8) to select the new field to display, It does not appear in HIDDEN FIELD.
Any suggestion, plz.
Thank you very much.

Clemens Li,
Thanks for your advice.
I have a new problem. Now, the new field appears in Selection. However, displaying the new field is impossible. My problem is:
- In default, 8 fields will display. Then, I use CHANGE LAYOUT to choose the new field which will be at 9th position. -> I got a dump... It informs that a Field Symbol is not assigned.
- Now, with the 8 fields above, I replace 8th position by the new field => It does not give me a dump but New field shows value of 8th field. I mean, if at first, 8th field is Quantity with value 10. Then I replace 8th field by my new field. When displaying again, it also gets 10 as its value.
- It is so strange. Because in function 'REUSE_ALV_LIST_DISPLAY', I used itab_data1, which consists of all field of itab_data and an addition field (NEW). I dont know why it does not show value of the new field while all old fields have right values. (before using that function, I copied all contents of itab_data to itab_data1)
So, everybody can help me this? Thanks

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