Re: Creating dynamic field catalogue

DATA : gt_dyn_table TYPE REF TO data,

        gw_line      TYPE REF TO data,

        gw_line1     TYPE REF TO data.

FIELD-SYMBOLS: <gfs_dyn_table> TYPE ANY TABLE.

DATA :  gw_dyn_fcat TYPE lvc_s_fcat,

         gv_pos(4)   TYPE n,

         gt_dyn_fcat TYPE lvc_t_fcat.

DATA : str TYPE string.

here pass alll your selected fields

   gv_pos = gv_pos + 1.

   CLEAR str.

   CONCATENATE 'FIELD' gv_pos INTO str .

   gw_dyn_fcat-fieldname = str.

   gw_dyn_fcat-outputlen = 1.

   gw_dyn_fcat-col_pos   = gv_pos.

   APPEND gw_dyn_fcat TO gt_dyn_fcat.

   CLEAR gw_dyn_fcat.

once all the selected fields are passed, create the table as shown below

CALL METHOD cl_alv_table_create=>create_dynamic_table

   EXPORTING

     it_fieldcatalog           = gt_dyn_fcat

   IMPORTING

     ep_table                  = gt_dyn_table

   EXCEPTIONS

     generate_subpool_dir_full = 1

     OTHERS                    = 2.

IF sy-subrc EQ 0.

   ASSIGN gt_dyn_table->* TO <gfs_dyn_table>.

ENDIF.