DYNAMIC INTERNAL TABLE CREATION BASED ON THE CONTENT OF ANOTHER INTERNAL TA

Hi All
I need to create an internal table at runtime.
I have a selection screen parameter which is specific to country, Which can take values below
eg:- IT_AREA for Italy(IT)
FR_AREA for France(FR)
IE_AREA for Ireland(IE).....And similary for other countries
Based on the Above parameter, I need to create Internal Table as below
DATA: itab TYPE italy_data Occurs 0.
If I declare as above, Then itab has fields from italy_data. And this internal table i will be sending it to Function Module to get data into it.
My Requirement is to Create the Internal table itab during runtime for tables italy_data OR france_data OR ireland_data based on selection screen parameter. Tables on Country may have different number of fields in it.
Can anyone help me on this??

Hi,
Here is a sample code to create a dynamic internal table.
REPORT ytrab03.
TABLES: mara, makt.
TYPE-POOLS: slis.
DATA: it_fcat TYPE slis_t_fieldcat_alv,
is_fcat LIKE LINE OF it_fcat,
ls_layout TYPE slis_layout_alv.
DATA: it_fieldcat TYPE lvc_t_fcat,
is_fieldcat LIKE LINE OF it_fieldcat.
DATA: new_table TYPE REF TO data,
new_line TYPE REF TO data,
ob_cont_alv TYPE REF TO cl_gui_custom_container,
ob_alv TYPE REF TO cl_gui_alv_grid,
vg_campos(255) TYPE c,
i_campos LIKE TABLE OF vg_campos,
vg_campo(30) TYPE c,
vg_tables(60) TYPE c.
DATA: e_params LIKE zutsvga_alv_01.
FIELD-SYMBOLS: <l_table> TYPE table,
<l_line> TYPE ANY,
<l_field> TYPE ANY.
PARAMETERS: p_max(2) TYPE n DEFAULT '20' OBLIGATORY.
is_fcat-fieldname = 'COL01'.
is_fcat-ref_fieldname = 'MATNR'.
is_fcat-ref_tabname = 'MARA'.
APPEND is_fcat TO it_fcat.
is_fcat-fieldname = 'COL02'.
is_fcat-ref_fieldname = 'MAKTX'.
is_fcat-ref_tabname = 'MAKT'.
APPEND is_fcat TO it_fcat.
LOOP AT it_fcat INTO is_fcat.
is_fieldcat-fieldname = is_fcat-fieldname.
is_fieldcat-ref_field = is_fcat-ref_fieldname.
is_fieldcat-ref_table = is_fcat-ref_tabname.
APPEND is_fieldcat TO it_fieldcat.
CONCATENATE is_fieldcat-ref_table is_fieldcat-ref_field
INTO vg_campos SEPARATED BY '~'.
APPEND vg_campos TO i_campos.
ENDLOOP.
*... Create the dynamic internal table
CALL METHOD cl_alv_table_create=>create_dynamic_table
EXPORTING
it_fieldcatalog = it_fieldcat
IMPORTING
ep_table = new_table.
*... Create a new line
ASSIGN new_table->* TO <l_table>.
CREATE DATA new_line LIKE LINE OF <l_table>.
ASSIGN new_line->* TO <l_line>.
SELECT (i_campos) FROM mara INNER JOIN makt
ON mara~matnr = makt~matnr
UP TO p_max ROWS
INTO TABLE <l_table>.
LOOP AT <l_table> INTO <l_line>.
LOOP AT it_fcat INTO is_fcat.
ASSIGN COMPONENT is_fcat-fieldname
OF STRUCTURE <l_line> TO <l_field>.
IF sy-tabix = 1.
WRITE: /2 <l_field>.
ELSE.
WRITE: <l_field>.
ENDIF.
ENDLOOP.
ENDLOOP.
Regards,
Karuna.

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