Dear Arthur ,
as per my understand , requirement is to generate 'X' no of times = db records.
need to gather the records based on query and pass it into final output internal table.
in the field catalog need to write the below code.
wa_fieldcat-fieldname = 'CHECKBOX'.
ADD 1 TO wf_pos.
wa_fieldcat-col_pos = wf_pos.
wa_fieldcat-datatype = 'C'.
wa_fieldcat-outputlen = '6'.
wa_fieldcat-reptext = 'Select'.
wa_fieldcat-coltext = 'Select'.
wa_fieldcat-seltext = 'Select'.
wa_fieldcat-tooltip = 'Select'.
wa_fieldcat-checkbox = 'X'.
wa_fieldcat-edit = 'X'.
wa_fieldcat-key = ''.
wa_fieldcat-icon = ''.
APPEND wa_fieldcat TO it_fieldcat.
and call nmethod.
CALL METHOD alv_grid->set_table_for_first_display
EXPORTING
is_layout = gs_layout
it_toolbar_excluding = lt_exclude
CHANGING
it_outtab = it_output
it_fieldcatalog = it_fieldcat..
I hope it would be useful to you .
Regards,
sudheer.