Hi Sandhya,
DATA: lr_grid TYPE REF TO cl_gui_alv_grid.
Call this Function module first,
After clicking on the Report1 button.
When 'Report1'.
data:g_stable type LVC_S_STBL.
CALL FUNCTION 'GET_GLOBALS_FROM_SLVC_FULLSCR'
E_GRID = lr_grid.
After calling this function module you will get the object of the CL_GUI_ALV_GRID.
after this call this method
CALL METHOD REF_GRID->CHECK_CHANGED_DATA .
automatically your changed data are coming to your internal table.
Now collect the changed data into other internal table.
and use the concept of the IMPORT and export or Submit report using your internal table.
Let me know if you face any other problem.
Regards.
Nishant Bansal