Drag and drop function in web dynpro

Data lo_cmp_usage type ref to if_wd_component_usage.

   lo_cmp_usage =   WD_THIS->wd_cpuse_ALV_TABLE( ).

   if lo_cmp_usage->has_active_component( ) is initial.

     lo_cmp_usage->create_component( ).

   endif.

   DATA:

    lr_salv_wd_table TYPE REF TO iwci_salv_wd_table,

    l_value TYPE REF TO cl_salv_wd_config_table,

    lr_table_settings TYPE REF TO if_salv_wd_table_settings,

    lr_input_field type ref to cl_salv_wd_uie_input_field,

    value TYPE REF TO IF_SALV_WD_DROP_TARGET_INFO.

   DATA lo_INTERFACECONTROLLER TYPE REF TO IWCI_SALV_WD_TABLE .

   lo_INTERFACECONTROLLER = wd_this->wd_cpifc_alv_table( ).

   l_value = lo_interfacecontroller->get_model( ).

   CALL METHOD l_value->IF_SALV_WD_DRAG_AND_DROP~CREATE_DROP_ROW_TARGET_INFO

     EXPORTING

       id      = 'ALV_TABLE'

       name    = 'from'

       enabled = abap_true

       tags    = 'from'.

   l_value->if_salv_wd_drag_and_drop~set_drop_row_name( 'from').

   l_value->IF_SALV_WD_DRAG_AND_DROP~SET_DROP_ROW_NAME_FIELDNAME( 'fight_no').